18-ELECTROTEHNICA

1.The current flow in a branch circuit is to be checked to determine if it is within the rated capacity of the circuit. The instrument best suited for this test would be:

2.Which of the following can be used to provide information about the shape of a voltage waveform?

3.The type of screwdriver designed for use on screws with an "X-shaped" insert in their heads is:

4.An electromechanical relay is basically:

5.Relays are primarily used to switch currents in the:

1. a multimeter. nmlkj2. a clip-on ammeter nmlkj3. a neon test light. nmlkj4. either b or c nmlkj

1. oscilloscope nmlkj2. multimeter nmlkj3. logic probe nmlkj4. neon test light nmlkj

1. a Phillips screwdriver nmlkj2. a Robertson screwdriver. nmlkj3. a standard screwdriver. nmlkj4. a hexagon screwdriver. nmlkj

1. an electromagnet used to switch contacts. nmlkj2. an electromagnet used to operate motors. nmlkj3. an electronic circuit used to control motors. nmlkj4. a device designed to relay information. nmlkj

1. control circuit. nmlkj2. load circuit. nmlkj3. power-distribution circuit. nmlkj4. live circuit.

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3/25/2011file://C:\WINDOWS\TEMP\cba4_5.html

6.Which of the following is not a common application for a relay?

7.A particular relay is rated as follows: coil-9V DC, 200 mA: contacts-120 V AC, 10 A. What maximum number of 100-W, 120-V light bulbs could be safely controlled by this relay?

8.A particular relay is rated as follows: coil-9 V DC, 200 mA; contacts-120 V AC, 10 A. The resistance of the coil would be:

9.For an electromechanical relay, the amount of voltage and current required to energize the relay coil is:

10.Relays with sets of contacts, which are closed by some type of magnetic effect, are called:

nmlkj

1. change alternating current to direct current nmlkj2. control a 120-V lighting circuit with a 24-V control circuit nmlkj3. control several switching operations by a single separate current nmlkj4. switch a high-current motor circuit ON and OFF with a low current control circuit nmlkj

1. 2 nmlkj2. 4 nmlkj3. 5 nmlkj4. 12 nmlkj

1. 45 . nmlkj2. 24 . nmlkj3. 6,000 . nmlkj4. 2,400 . nmlkj

1. the same when connected on an AC or a DC source. nmlkj2. the same as the voltage and current ratings of the contacts. nmlkj3. more than what is required to de-energize the coil nmlkj4. less than what is required to de-energize the coil. nmlkj

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11.Relays with no contacts, which are switched entirely by electronic devices, are called:

12.Solid-state relays use ____ as switching devices.

13.Which of the following is not an advantage of solid-state relays over electromechanical relays?

14.The purpose of overload protection on a motor is to protect:

15.The current drawn by a motor is:

1. electromechanical relays. nmlkj2. solid-state relays. nmlkj3. hybrid relays. nmlkj4. magnetic relays. nmlkj

1. electromechanical relays. nmlkj2. solid-state relays. nmlkj3. hybrid relays. nmlkj4. magnetic relays. nmlkj

1. semiconductors nmlkj2. coils nmlkj3. contacts nmlkj4. permanent magnets nmlkj

1. longer life nmlkj2. less electromagnetic interference generated nmlkj3. less susceptible to damage from voltage and current spikes nmlkj4. faster response time nmlkj

1. the motor from sustained overcurrents. nmlkj2. the wire from high currents. nmlkj3. the motor from sustained over voltage. nmlkj4. the motor from short circuits. nmlkj

1. low on starting. nmlkj

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16.Which of the following is designed to provide machine operation protection by requiring the motor to be restarted after a power failure?

17.A contactor differs from a relay in that:

18.Technician A says a reduced-voltage starter is designed to apply full line voltage to the motor upon starting. Technician B says reduced-voltage starting produces a lower starting torque. Who is correct?

19.Which of the following starters increases the voltage gradually as the motor starts?

20.Which of the following applies to stopping a motor by electronically reversing the motor while it is still running in the forward direction?

2. high on starting. nmlkj3. an accurate measurement of motor load. nmlkj4. both b and c nmlkj

1. phase-reversal protection nmlkj2. ground-fault protection nmlkj3. low-voltage protection nmlkj4. low-voltage release nmlkj

1. it operates on a different principle. nmlkj2. its contacts can interrupt large motor currents. nmlkj3. gravity and spring tension open contacts. nmlkj4. all of these nmlkj

1. Technician A only nmlkj2. Technician B only nmlkj3. both Technician A and Technician B nmlkj4. neither Technician A nor Technician B nmlkj

1. primary-resistance starter nmlkj2. autotransformer starter nmlkj3. wye-delta starter nmlkj4. solid-state starter nmlkj

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21.Motor drive systems are used:

22.Which of the following is not a characteristic of AC motors?

23.In a variable-speed drive for a three-phase motor, which of the following circuits changes the DC power back to an adjustable frequency AC output?

24.Sensors are used to detect the presence of and/or measure:

25.The insulating material on a printed circuit board is called:

1. dynamic braking nmlkj2. regenerative braking nmlkj3. plugging nmlkj4. jogging nmlkj

1. with AC or DC motors. nmlkj2. when operator-controlled variance of speed is required. nmlkj3. to maintain steady motor speed in spite of load fluctuations. nmlkj4. all of these nmlkj

1. high torque at low speed nmlkj2. lower cost nmlkj3. less maintenance required nmlkj4. physically smaller than DC motors of the same horsepower nmlkj

1. rectifier nmlkj2. inverter nmlkj3. regulator nmlkj4. modulator nmlkj

1. temperature. nmlkj2. position. nmlkj3. light. nmlkj4. all of these nmlkj

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26.The foil pattern layout for a PC board shows:

27.Resist is any material which:

28.The most commonly-used solder for soldering component leads to a PC board is:

29.A properly-soldered PC board connection will:

30. Large components that require considerable mounting space on a PC board are usually

1. the laminate. nmlkj2. the dielectric. nmlkj3. the cladding. nmlkj4. the foil. nmlkj

1. all the interconnecting terminal strip connections. nmlkj2. the exact location of all the component parts. nmlkj3. all necessary conductor routing required for the working circuit. nmlkj4. all of these nmlkj

1. acts like a resistor. nmlkj2. offers resistance to the flow of current in a circuit. nmlkj3. will resist the chemical reaction used to etch copper. nmlkj4. all of these nmlkj

1. 20/80 bar solder. nmlkj2. 40/40 solid wire solder. nmlkj3. 60/40 resin-core wire solder. nmlkj4. 50/50 acid-core wire solder. nmlkj

1. have low resistance. nmlkj2. appear shiny. nmlkj3. have no pin holes. nmlkj4. all of these nmlkj

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31.When drilling lead access holes in a PC board:

32.For mass production of printed circuit boards, the type of printing process most often used is:

33.When soldering on a PC board, the solder is always applied to:

34.Cleaning the copper foil of a PC board prior to soldering:

35.A computer is basically a digital electronic system.

1. integrated on to the board with very small components that require little space. nmlkj2. mounted at 90? to all other components. nmlkj3. shielded to prevent electrical interference. nmlkj4. left off the board completely and hand-wired. nmlkj

1. moderate pressure should be applied to the drill. nmlkj2. heavy pressure should be applied to the drill. nmlkj3. the drill must be of a large enough diameter to completely remove the terminal pad copper foil. nmlkj4. both a and c nmlkj

1. the photo-etch method. nmlkj2. hand printing. nmlkj3. the print-and-etch technique. nmlkj4. machine printing. nmlkj

1. the tip of the soldering iron only. nmlkj2. both the tip of the soldering iron and the component lead. nmlkj3. the junction of the lead and the terminal pad area. nmlkj4. the laminate. nmlkj

1. is only necessary if the foil appears dirty or dull. nmlkj2. is only necessary if a rosin based flux is not used. nmlkj3. is essential in all instances. nmlkj4. both a and b nmlkj

1. True nmlkj

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36.Computers are capable of storing large amounts of data.

37.Nonvolatile memory loses all its information when power is removed.

38.The computing power of a computer is determined by its wattage rating.

39.All computers are able to get data into and out of memory at approximately the same speed.

40.The input/output provisions for microprocessor-based systems are all basically the same.

41.The microprocessor uses only analog signals.

42.Types of output devices include instrumental displays and actuators.

2. False nmlkj

1. True nmlkj2. False nmlkj






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43.MS-DOS is an example of a programming language.

44.Word processing is a type of computer applications software.

45.In any number system, the position of a digit that represents part of the number has a weighted value associated with it.

46.To express a number in binary requires fewer digits than in the decimal system.

47.Most digital logic circuits are constructed using integrated circuits.

48.Combinational logic circuits have no memory.








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49.The primary function of a combinational logic circuit is to make decisions.

50.The only true mathematical operation performed by a computer is division.

51.The state of a flip-flop is determined by observing its Q output.

52.In a D flip-flop, the Q output is the same as the D input one clock pulse later.

53.Asynchronous is the term used to designate control by a clock pulse.

54.Binary counters are usually constructed using XOR gates.

55.An integrated circuit:







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56.Which of the following IC packages is extremely vulnerable to damage from static electricity?

57.The use of ICs:

58.Digital ICs contain:

59.Analog ICs contain:

60.The operational amplifier (op-amp) is:

1. is a series of transistors mounted within a silicon chip. nmlkj2. refers to separately-produced components wired together with conductors to produce a complete

circuit. nmlkj

3. is a complete electronic circuit with all components and interconnecting wiring contained within a single chip of silicon.

nmlkj

4. is a series of separately-produced components wired within a printed circuit board. nmlkj

1. DIP nmlkj2. digital nmlkj3. analog nmlkj4. MOS nmlkj

1. is limited because of their high cost. nmlkj2. permits very complex circuits to have small physical dimensions. nmlkj3. is common in high-current circuits. nmlkj4. is common in high-voltage circuits. nmlkj

1. amplifying-type circuitry. nmlkj2. resistors, capacitors, and transistors. nmlkj3. resistors, capacitors, and diodes. nmlkj4. switch-type circuitry. nmlkj

1. amplifying-type circuitry. nmlkj2. resistors, capacitors, and transistors. nmlkj3. resistors, capacitors, and diodes. nmlkj4. switch-type circuitry. nmlkj

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61.The output power rating of an op-amp:

62.An IC voltage comparator is basically:

63.A 555 Timer IC is connected as a free-running oscillator. How can the output frequency be increased?

64.Technician A says the duty cycle of a pulse waveform is the percentage of the time the output is high. Technician B says the duty cycle of a pulse waveform is found by dividing the total ON time by the total OFF. Who is correct?

1. a high-gain amplifier. nmlkj2. a type of analog IC. nmlkj3. used to amplify AC or DC signals. nmlkj4. all of these nmlkj

1. varies with the type of op-amp used. nmlkj2. is unlimited. nmlkj3. if exceeded, can damage the op-amp by overheating. nmlkj4. both a and c nmlkj

1. an oscillator operated with a positive feedback circuit. nmlkj2. an oscillator circuit without a feedback circuit. nmlkj3. an op-amp operated with a negative feedback circuit. nmlkj4. an op-amp operated without a feedback circuit. nmlkj

1. decrease the capacitance of the timing capacitor nmlkj2. increase the resistance of the timing resistors nmlkj3. increase the capacitance of the timing capacitor nmlkj4. decrease the input signal frequency nmlkj


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65.When troubleshooting most electronic circuits, 'loading effect' can be minimized by using a voltmeter with a/an:

66.A semiconductor that decreases in resistance with an increase in temperature is known as a:

67.The shunt used in an ammeter should be connected in.

68.External shunts are sometimes used with ammeters to:

69.Which of the following statements represents an application of a silicon controlled rectifier?

1. input impedance much greater than the impedance across which the voltage is being measured nmlkj2. input impedance much less than the impedance across which the voltage is being measured nmlkj3. sensitivity of less than 1000 ohms/volt nmlkj4. sensitivity of more than 1000 volts/ohm nmlkj

1. resistor nmlkj2. thermistor nmlkj3. diode nmlkj4. thermopile nmlkj

1. series with the load and in parallel with the meter movement nmlkj2. parallel with the load and in series with the meter movement nmlkj3. parallel with the load and in parallel with the meter movement nmlkj4. series with the load and in series with the meter movement nmlkj

1. increase meter sensitivity nmlkj2. permit shunts with larger resistances to be utilized nmlkj3. prevent damage to the meter movement from heat generated by the shunt nmlkj4. enable the construction of a compact meter with a virtually unlimited range nmlkj

1. To provide DC power for a main propulsion motor. nmlkj2. For use as a voltage reference diode. nmlkj3. For sensing flame in an automated burner. nmlkj4. To eliminate power supply hum.

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70.An accidental path of low resistance, allowing passage of abnormal amount of current is known as a/an :

71.A resistance in a circuit of unknown value is to be tested using the voltmeter/ammeter method. Therefore, the meters should be connected with :

72.A direct current passing through a wire coiled around a soft iron core is the description of a simple :

73.The use of four diodes, in a full-wave bridge rectifier circuit, will :

74.When troubleshooting electronic equipment, you should use a high impedance multimeter :

nmlkj

1. open circuit nmlkj2. short circuit nmlkj3. polarized ground nmlkj4. ground reference point nmlkj

1. both meters in series with the resistance nmlkj2. both meters in parallel with the resistance nmlkj3. the ammeter in series and the voltmeter in parallel with the resistance nmlkj4. the ammeter in parallel and the voltmeter in series with the resistance nmlkj

1. magnetic shield nmlkj2. electromagnet nmlkj3. piezoelectric device nmlkj4. electromagnetic domain nmlkj

1. provide unidirectional current to the load nmlkj2. allow a very high leakage current from the load nmlkj3. convert direct current to alternating current nmlkj4. offer high opposition to current in two directions nmlkj

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75.Which of the listed devices is used to measure pressure and convert it to an electrical signal ?

76.The device that most commonly utilizes the principle of electromagnetic induction is the :

77.Which of the following statements concerning analog and digital devices are correct?

78.The Wheatstone bridge is a precision measuring instrument utilizing the principle of changes in :

79.Which of the listed logic gates is considered to be a BASIC building block (basic logic gate) used in logic diagrams?

1. to prevent excess current flow through the meter that would damage it nmlkj2. for AC measurements only and a low resistance meter for DC measurements nmlkj3. whenever a low impedance meter is not available, regardless of the components being tested nmlkj4. so as not to load down the circuit and obtain erroneous voltage readings nmlkj

1. Transducer nmlkj2. Reducer nmlkj3. Transformer nmlkj4. Rectifier nmlkj

1. diode nmlkj2. transformer nmlkj3. transistor nmlkj4. rheostat nmlkj

1. The variables in digital systems are fixed quantities, and the variables in analog systems are continuous quantities.

nmlkj

2. There are no basic differences between the two systems. nmlkj3. Analog devices are superior in accuracy compared to digital devices. nmlkj4. Operations in a digital device are performed simultaneously. nmlkj

1. inductance nmlkj2. capacitance nmlkj3. resistance nmlkj4. amperage nmlkj

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80.Heat sinks are frequently used with :

81.The first requirement for logical troubleshooting of any system is the ability to :

82.A fuse that blows often should be replaced only with a fuse of :

83.Which of the listed conditions is an advantage of a PN diode over a vacuum diode?

84.The heating of conductors as a result of resistance in a distribution circuit causes a power loss expressed as :

1. NAND nmlkj2. OR nmlkj3. NOR nmlkj4. All of the above. nmlkj

1. power transistors nmlkj2. vacuum tubes nmlkj3. tunnel rectifier diodes nmlkj4. all of the above nmlkj

1. collect all available data on a casualty nmlkj2. recognize normal operation nmlkj3. identify the probable cause of a symptom nmlkj4. isolate the faulty component nmlkj

1. the recommended current and voltage rating nmlkj2. higher current and voltage rating nmlkj3. higher current and lower voltage rating nmlkj4. lower current and higher voltage rating nmlkj

1. Longer life. nmlkj2. No warm up time. nmlkj3. Less delicate. nmlkj4. All of the above. nmlkj

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85.In process control terminology values which can change without distinct increments, such as temperature, pressure, or level are called :

86.Silicon diodes designed for a specific reverse breakdown voltage, become useful as an electronic power supply voltage regulator, called :

87.The type of feature afforded auxiliaries vital to the operation of propelling equipment, where automatic restart after a voltage failure would not create a hazard, is termed :

88.Which of the following statements correctly applies to transistors?

1. line droop nmlkj2. line loss nmlkj3. IR drop nmlkj4. hysteresis nmlkj

1. binary values nmlkj2. digital values nmlkj3. bumpless values nmlkj4. analog values nmlkj

1. tunnel diodes nmlkj2. hot-carrier diodes nmlkj3. compensating diodes nmlkj4. Zener diodes nmlkj

1. low voltage protection nmlkj2. high amperage protection nmlkj3. low voltage release nmlkj4. high amperage release nmlkj

1. NDN and PNP are the two basic types of transistors. nmlkj2. The three terminals are called the emitter, base, and collector. nmlkj3. The emitter separates the base and collector. nmlkj4. The collector separates the emitter and base. nmlkj

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89.The basic measuring unit of inductance is the :

90.Alternating current circuits develop resistance, inductance and capacitance. The inductance of a coil is expressed in :

91.An insulation resistance test is performed on a particular piece of electric equipment. In addition to the resistance reading, what information listed below should be entered in the electrical log?

92.Alternating current circuits develop resistance, inductance, and capacitance. The capacitance of individual capacitors is expressed in :

93.Which of the following statements represents the important factor that must be considered when replacing a faulty diode in the exciter rectifier assembly?

1. coulomb nmlkj2. ohm nmlkj3. farad nmlkj4. henry nmlkj

1. ohms nmlkj2. mhos nmlkj3. henrys nmlkj4. farads nmlkj

1. The maximum allowable operating temperature of the machine. nmlkj2. The temperature of the machine at the time the resistance reading was taken. nmlkj3. The normal temperature rise of the machine. nmlkj4. The complete nameplate data from the resistance test instrument used to obtain the reading. nmlkj


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94.The insulation resistance of electric equipment and machinery should be tested for the lowest normal insulation values :

95.A triac thyristor functions as a control device and is basically :

96.The apparent power in a purely inductive circuit is also known as :

97.The multiple prefix 'giga' (G) means :

98.Copper is often used as an electrical conductor because it :

1. Be certain that the replacement diode is the same polarity as the one removed. nmlkj2. Never alter the diode alignment to cause a change in the neutral plane. nmlkj3. Replacement of a diode also requires balancing of the rotor with a one-piece rotor lamination to be

shrunk fit and keyed to the shaft. nmlkj

4. The replacement diode must be dipped in varnish prior to installation to protect against humidity. nmlkj

1. immediately after shutting down the machine nmlkj2. every time the brush rigging is adjusted nmlkj3. immediately after starting up the machine nmlkj4. every 30 days whether the machine is in use or not nmlkj

1. two NPN transistors in parallel with a common base lead nmlkj2. a diode in series with a temperature sensitive capacitor nmlkj3. two back-to-back SCR's with a common gate lead nmlkj4. a triode tube with an extra heavy grid element nmlkj

1. true power nmlkj2. lead power nmlkj3. induced power nmlkj4. reactive power nmlkj

1. thousand (10 to the 3rd power) nmlkj2. million (10 to the 6th power) nmlkj3. billion (10 to the 9th power) nmlkj4. trillion (10 to the 12th power) nmlkj

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99.The unit of apparent power in a purely inductive circuit is called the :

100.A grounded switch or cable will be indicated by a megohmmeter reading of :

101.The multiple prefix 'kilo' means :

102.An adjustable resistor, whose resistance can be changed without opening the circuit in which it is connected, is called a :

103.The purpose of a heat sink, as frequently used with transistors, is to :

1. has high resistance at low temperatures nmlkj2. has a highly polished surface nmlkj3. is able to pass current with little opposition nmlkj4. holds insulation together well nmlkj

1. kva nmlkj2. var nmlkj3. emf nmlkj4. watt nmlkj

1. infinity nmlkj2. 'zero' nmlkj3. being unsteady in the high range nmlkj4. being unsteady in the low range nmlkj

1. thousand (10 to the 3rd power) nmlkj2. million (10 to the 6th power) nmlkj3. billion (10 to the 9th power) nmlkj4. trillion (10 to the 12 power) nmlkj

1. bleeder resistor nmlkj2. rheostat nmlkj3. bridge nmlkj4. variable shunt strip nmlkj

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104.The combined effect of inductive reactance, capacitive reactance, and resistance in an AC series circuit is known as :

105.In a DC series circuit, all the conductors have the same :

106.AC circuits develop resistance, inductance, and capacitance. The inductive reactance of a circuit is expressed in :

107.A silicon controlled rectifier (SCR) is a solid state device used to change :

1. prevent excessive temperature rise nmlkj2. compensate for excessive doping nmlkj3. increase the reverse current nmlkj4. decrease the forward current nmlkj

1. reactance nmlkj2. total reactance nmlkj3. impedance nmlkj4. resonance nmlkj

1. power expended in them nmlkj2. voltage drop across them nmlkj3. resistance to current flow nmlkj4. current passing through them nmlkj


1. DC to AC and control relatively low load current nmlkj2. AC to DC and control relatively high load current nmlkj3. DC to AC and control relatively high load current nmlkj4. AC to DC and control relatively low load current nmlkj

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108.The basic control action of a magnetic amplifier depends upon :

109.The process, whereby electrons gain sufficient energy to be released from the surface of a thin, heated metal plate, is known as :

110.Most conducting materials such as copper, aluminum, iron, nickel, and tungsten :

111.In a series circuit, which value will remain unchanged at all places in the circuit?

112.In electronic circuitry, the abbreviation 'PCB' commonly means ______________.

1. variations in the load capacitance nmlkj2. changes in inductance nmlkj3. type of core material nmlkj4. construction of the core nmlkj

1. photo electric emission nmlkj2. secondary emission nmlkj3. thermionic emission nmlkj4. regressive emission nmlkj

1. increase in resistance with increased temperature nmlkj2. increase in resistance with decreased temperature nmlkj3. decrease in resistance with increased temperature nmlkj4. increase in conductance with increased temperature nmlkj

1. Voltage nmlkj2. Current nmlkj3. Resistance nmlkj4. Inductance nmlkj

1. pulse coded binary nmlkj2. printed circuit board nmlkj3. poly-coated braid nmlkj4. personal computer bits nmlkj

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113.Which of the listed conditions describes the effect on intrinsic semiconductor operation as a result of a temperature increase?

114.In electronic circuits, DC voltages can be positive (+) or negative (-) when measured with respect to the :

115.Capacitors are used on the output of the power supply in today's consoles to :

116.Operational amplifiers, used primarily in analog circuits, are characterized by :

117.Reversing the current flow through a coil will :

1. Additional heat sinks will be required nmlkj2. Conductivity will increase nmlkj3. Conductivity will decrease nmlkj4. Resistivity will increase nmlkj

1. printed circuit board 'common' trace nmlkj2. chassis, console frame or hull 'ground' nmlkj3. analogue or digital circuitry 'common' bus nmlkj4. all of the above nmlkj

1. filter out 'ripple' nmlkj2. prevent overloads nmlkj3. act as a permanent load nmlkj4. decrease the average value of the output voltage nmlkj

1. high input impedance, high gain and low output impedance nmlkj2. high input impedance, high gain and high output impedance nmlkj3. low input impedance, low gain and high output impedance nmlkj4. low input impedance, high gain and low output impedance nmlkj

1. reduce the amount of flux produced nmlkj2. have no effect on the eddy currents produced nmlkj3. reduce the power consumed nmlkj4. reverse its two-pole field

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118.The schematic symbol for an operational amplifier in an analog circuit is a :

119.The total resistance of a parallel circuit is always :

120.Which of the following expresses the relationship of the input and output frequencies in a full wave rectifier?

121.A temperature instrumentation system for an engine room console consists of a resistance temperature detector (RTD), a measuring bridge circuit, and a meter (or alarm circuit).Which of the following statements is true concerning the measuring bridge circuit :

122.One feature of the operational amplifier is that it can have :

nmlkj

1. circle nmlkj2. square nmlkj3. trapezoid nmlkj4. triangle nmlkj

1. larger than the greatest branch resistance nmlkj2. smaller than the lowest branch resistance nmlkj3. equal to the sum of the individual branch resistances nmlkj4. one-half the sum of the individual branch resistances nmlkj

1. The output frequency is the same as input frequency. nmlkj2. The output frequency is one-half the input frequency. nmlkj3. The output frequency is twice the input frequency. nmlkj4. The output frequency is four times the input frequency. nmlkj

1. The input voltage varies in a linear fashion with temperature. nmlkj2. The voltage across the center of the resistance bridge is always constant. nmlkj3. The resistance bridge is said to be balanced when its output voltage is zero. nmlkj4. The input voltage of the resistance bridge is the constant temperature signal. nmlkj

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123.A signal derived from a controlled function and returned to the initiating point is called a/an :

124.A semiconductor is a material with a :

125.A capacitor can be tested using a megohmmeter or an ohmmeter. If the meter is connected to a shorted capacitor, the meter pointer should :

126.To provide its unique characteristics to analog circuits, the operational amplifier is made up of a/an :

127.When replacing a power transistor fitted with a heat sink in a circuit, a coating of silicone

1. up to ten outputs nmlkj2. binary coded decimal inputs nmlkj3. several hundred amps at the output nmlkj4. inverting and non-inverting inputs nmlkj

1. monitoring signal nmlkj2. inverse signal nmlkj3. reverse signal nmlkj4. feedback signal nmlkj

1. conductivity higher than a normal conductor nmlkj2. conductivity higher than a normal insulator nmlkj3. high conductivity at low temperatures nmlkj4. low conductivity at high temperatures nmlkj

1. immediately swing to the maximum resistance value for the capacitor nmlkj2. first swing quickly to 'zero', then gradually move up the scale as the capacitor charges nmlkj3. immediately deflect to and remain at zero nmlkj4. immediately swing to a high reading and then gradually decrease nmlkj

1. voltage amp, current amp and output amp nmlkj2. input amp, power amp and output amp nmlkj3. scaling amp, power amp and voltage amp nmlkj4. differential amp, voltage amp and output amp nmlkj

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grease is applied between the transistor case and the heat sink. This is done to :

128.The resistance of a conductor varies :

129.In order to check the performance of a transistor removed from its circuit, the instrument to be used should be a/an :

130.When a megohmmeter is being used to test insulation resistance, current leakage along the surface of the insulation is indicated by the megohmmeter's pointer :

131.Which of the following actions can be carried out in order to prevent thermal runaway in a transistor?

1. lubricate the transistor nmlkj2. lubricate the heat sink nmlkj3. aid in the removal of the heat sink nmlkj4. provide maximum heat transfer nmlkj

1. directly as its length and inversely as its cross-sectional area nmlkj2. inversely as its length and directly as its cross-sectional area nmlkj3. directly as its length and directly as its cross-sectional area nmlkj4. inversely as its length and inversely as its cross-sectional area nmlkj

1. voltmeter or transistor tester nmlkj2. impedance meter nmlkj3. ohmmeter or transistor tester nmlkj4. sensitive potentiometer nmlkj

1. dipping toward zero then raising slowly nmlkj2. continually rising as test voltage is applied nmlkj3. kicking slightly down scale as voltage is applied nmlkj4. fluctuating around a constant resistance reading nmlkj

1. Increase the current through the collector-base junction. nmlkj2. Install a heat sink. nmlkj3. Shift the "Q" point to increase collector current. nmlkj

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132.Basic operating characteristics of the operational amplifier such as gain and stability are the function of its :

133.Possible phase relationships between voltage and current in an alternating current circuit include which of the following conditions?

134.A suspected 'open' in a motor field can be tested by using a/an :

135.The sub-multiple prefix 'nano' (n) means :

136.A switchboard, for a AC electrical distribution system, will be provided with which of the following components?

4. Increase the potential difference between the emitter and the base. nmlkj

1. differential input stage nmlkj2. power output stage nmlkj3. feedback circuit nmlkj4. supply voltages nmlkj

1. Current and voltage may be in phase. nmlkj2. Current may lead the voltage. nmlkj3. Current may lag the voltage. nmlkj4. All of the above. nmlkj

1. potentiometer nmlkj2. ohmmeter nmlkj3. wattmeter nmlkj4. ammeter nmlkj

1. thousandth (10 to the -3rd power) nmlkj2. millionth (10 to the -6th power) nmlkj3. billionth (10 to the -9th power) nmlkj4. trillionth (10 to the -12th power) nmlkj

Page 27 of 205


137.Which of the procedures listed could result in damaging a transistor beyond repair?

138.Basically, a magnetic amplifier is a saturable reactor with the addition of :

139.Which of the electrical properties listed will always be the same for each component in a parallel circuit?

140.Which of the listed instruments can be best used to locate a grounded field coil in a synchronous motor?

141.A capacitor discolored due to excessive heat should be :

1. Frequency meter. nmlkj2. Ammeter nmlkj3. Voltmeter nmlkj4. All of the above nmlkj

1. Applying incorrect polarity to the collector circuit. nmlkj2. Applying excessive voltage to the input circuit. nmlkj3. Careless soldering which would overheat the transistor. nmlkj4. All of the above. nmlkj

1. AC to the bias winding nmlkj2. variable capacitance to all windings nmlkj3. eddy current protectors nmlkj4. a rectifier in the load circuit nmlkj

1. Impedance nmlkj2. Current nmlkj3. Resistance nmlkj4. Voltage nmlkj

1. Frequency meter nmlkj2. Megohmmeter nmlkj3. Voltmeter nmlkj4. Multimeter nmlkj

Page 28 of 205


142.A covalent bond:

143.If a silicon crystal is doped with a material having five valence electrons:

144.If a germanium crystal is doped with a material having three valence electrons:

145.In a PN-junction diode, the depletion region is formed by:

146.A PN-junction diode is said to be forward- or reverse-biased depending on:

1. calibrated nmlkj2. replaced nmlkj3. cooled nmlkj4. soldered nmlkj

1. bonds atoms in pure semiconductor materials. nmlkj2. involves the sharing of outer shell electrons. nmlkj3. produces the equivalent of an atom with a full outer shell. nmlkj4. all of these nmlkj

1. an insulator is formed. nmlkj2. its resistance goes up. nmlkj3. a P-type semiconductor is formed. nmlkj4. an N-type semiconductor is formed. nmlkj

1. a conductor is formed. nmlkj2. an insulator is formed. nmlkj3. a P-type semiconductor is formed. nmlkj4. an N-type semiconductor is formed. nmlkj

1. applying forward bias across the diode. nmlkj2. heating the diode to a high temperature. nmlkj3. electrons crossing the junction and filling the holes. nmlkj4. current flowing from anode to cathode. nmlkj

Page 29 of 205


147.Excessive reverse-bias voltage may cause a silicon diode to:

148.When checking a diode with an ohmmeter, a good diode would be indicated by:

149.A diode rated for 35-V peak forward-bias voltage is used in a circuit rated for a peak forward-bias voltage of 24 V. The diode will:

150.A light-emitting diode (LED) will:

151.The laser diode has a(n) ____ which is required for lasing production.

1. the type of dopant used. nmlkj2. the polarity of the AC voltage applied across it. nmlkj3. the polarity of the DC voltage applied across it. nmlkj4. all of these nmlkj

1. avalanche. nmlkj2. reverse its polarity. nmlkj3. turn OFF. nmlkj4. become an insulator. nmlkj

1. a low-resistance reading in both directions. nmlkj2. a high-resistance reading in both directions. nmlkj3. a zero-resistance reading in both directions. nmlkj4. a low-resistance reading in the one direction and a high-resistance reading in the other. nmlkj

1. operate normally. nmlkj2. not operate at all. nmlkj3. operate normally but will not last as long. nmlkj4. operate, but with different characteristics. nmlkj

1. conduct a current in one direction only. nmlkj2. give off light when current flows through it. nmlkj3. consume less energy than a filament-type light bulb. nmlkj4. all of these nmlkj

Page 30 of 205


152.The three leads of a bipolar junction transistor are:

153.Field-effect transistors (FETs) operate:

154.The PNP transistor is the complement of the NPN transistor. This means:

155.A bipolar-junction transistor circuit is operated so that:

156.The drain current produced by a properly biased N-channel junction FET will decrease when the FET's gate is:

1. optical cavity nmlkj2. depletion area nmlkj3. hole current carriers nmlkj4. electron current carriers nmlkj

1. the anode, the base, and the cathode. nmlkj2. the emitter, the gate, and the anode. nmlkj3. the base, the collector, and the emitter. nmlkj4. the grid, the anode, and the cathode. nmlkj

1. on the same principle as magnetic field devices. nmlkj2. with a small input voltage and current. nmlkj3. with a small input voltage but practically no input current. nmlkj4. with high input current. nmlkj

1. that the two operate on different principles. nmlkj2. that one can be replaced by the other in a given circuit, and it will still operate. nmlkj3. that the two are electrically similar except that opposite current and voltages are involved. nmlkj4. that one is designed to operate from an AC source and the other from a DC source. nmlkj

1. a small change in base current controls a large change in collector current. nmlkj2. a small change in collector current controls a large change in base current. nmlkj3. a small change in collector current controls a large change in emitter current. nmlkj4. a small change in emitter current controls a large change in collector current. nmlkj

Page 31 of 205


157.The input resistance of a junction FET will remain extremely high as long as the FET's gate-to-channel junction is:

158.An insulated-gate FET will maintain a high input resistance when its gate is made:

159.To protect MOSFETs against static charges:

160.A unijunction transistor (UJT):

161.When a UJT switches to the ON state, current is conducted between:

1. made more negative with respect to its source. nmlkj2. made less negative with respect to its source. nmlkj3. shorted to its source to reduce VGS to zero. nmlkj4. subjected to a potential, which decreases the size of the depletion region. nmlkj

1. biased so that the FET is operating in the enhancement mode. nmlkj2. biased so that the gate current flows. nmlkj3. forward-biased. nmlkj4. reverse-biased. nmlkj

1. positive only. nmlkj2. negative only. nmlkj3. positive or negative with respect to its source. nmlkj4. to conduct a low reverse current. nmlkj

1. the leads are coated with a varnish insulation. nmlkj2. the leads are shorted together until they are placed into a circuit. nmlkj3. they are shipped in special static-protection packages. nmlkj4. both b and c nmlkj

1. operates similar to a bipolar transistor. nmlkj2. operates similar to a field-effect transistor. nmlkj3. does not amplify. nmlkj4. none of these nmlkj

Page 32 of 205


162.The main application for SCRs and triacs is:

163.A silicon-controlled rectifier (SCR) is normally biased so that it can be turned ON by:

164.When an SCR circuit is operated from an AC source:

165.In order for an SCR to be triggered into conduction:

166.SCR phase-shift control circuits are used to vary the ____ between the trigger pulse and the point in the conducting cycle when the pulse occurs.

1. collector and emitter. nmlkj2. base 1 and base 2. nmlkj3. emitter and base 1. nmlkj4. all of these nmlkj

1. as audio amplifiers. nmlkj2. as oscillators. nmlkj3. for control of current in the milliampere range. nmlkj4. for control of power in the watt or kilowatt range. nmlkj

1. momentarily increasing its forward voltage. nmlkj2. increasing its reverse voltage. nmlkj3. momentarily applying a gate current. nmlkj4. momentarily decreasing its gate current. nmlkj

1. the gate can be used to switch the circuit ON and OFF at all times. nmlkj2. once switched ON by the gate, the circuit can not be switched OFF by the gate. nmlkj3. the output is always DC. nmlkj4. both a and c nmlkj

1. the anode must be positive with respect to the cathode. nmlkj2. both the anode and the gate must be positive with respect to the cathode. nmlkj3. the anode must be negative with respect to the cathode. nmlkj4. the gate must be positive with respect to the cathode. nmlkj

Page 33 of 205


167.____ of the positive half-cycle will be conducted to the load, depending on when the SCR fires.

168.How is a silicon-controlled rectifier similar to a diode rectifier?

169.The main difference between the operation of an SCR and a triac is:

170.An out-of-circuit ohmmeter check of a non-defective 24-V diac should indicate:

171.Breakover voltage of a diac is:

1. power delivered nmlkj2. time relationship nmlkj3. different points nmlkj4. motor speed nmlkj

1. All nmlkj2. None nmlkj3. Part nmlkj4. all of these nmlkj

1. Both conduct current in one direction only. nmlkj2. Both can be classified as thyristors. nmlkj3. Both have one PN junction. nmlkj4. all of these nmlkj

1. an SCR produces less heat than a triac during normal operation. nmlkj2. an SCR is a switching device, while a triac is an amplifying device. nmlkj3. an SCR can be triggered into conduction in only one direction. nmlkj4. an SCR is made of silicon but a triac is not. nmlkj

1. a high resistance reading in both directions. nmlkj2. a low resistance reading in both directions. nmlkj3. a high resistance reading in one direction and a low resistance reading in the other. nmlkj4. zero resistance in one direction and infinite resistance in the other. nmlkj

1. never to be exceeded. nmlkj

Page 34 of 205


172.The joule is the base unit of:

173.The part of the atom that has no electric charge is the:

174.A positive charge can:

175.The nucleus of most atoms contain:

176.A negative ion has an excess of:

2. the point at which its resistance changes from high to low. nmlkj3. the same as avalanche voltage. nmlkj4. always less than 0.6 V. nmlkj

1. energy nmlkj2. work nmlkj3. neither of the above nmlkj4. both of the above nmlkj

1. neutron nmlkj2. nucleus nmlkj3. neither of the above nmlkj4. both of the above nmlkj

1. attract a negatively charged object nmlkj2. attract and then repel a neutral object nmlkj3. neither of the above nmlkj4. both of the above nmlkj

1. neutrons nmlkj2. protons nmlkj3. neither of the above nmlkj4. both of the above nmlkj

1. electrons

Page 35 of 205


177.A proton has:

178.Electrons in the outermost shell of an atom are called:

179.When an electron becomes a free electron its energy level is:

180.The base unit of charge is the:

181.The joule is the base unit of:

nmlkj2. protons nmlkj3. neither of the above nmlkj4. both of the above nmlkj

1. a positive electric charge nmlkj2. a negative electric charge nmlkj3. neither of the above nmlkj4. both of the above nmlkj

1. free electrons nmlkj2. valence electrons nmlkj3. neither of the above nmlkj4. both of the above nmlkj

1. cut in half nmlkj2. unchanged nmlkj3. doubled nmlkj4. none of the above nmlkj

1. ampere nmlkj2. coulomb nmlkj3. ohm nmlkj4. volt nmlkj

1. energy nmlkj

Page 36 of 205


182.Kilowatthour is a unit of:

183.A wattsecond is equal to a(n):

184.

185.A coulomb per second equals the base unit of:

2. current nmlkj3. power nmlkj4. resistance nmlkj

1. charge nmlkj2. energy nmlkj3. power nmlkj4. time nmlkj

1. ampere nmlkj2. coulomb nmlkj3. joule nmlkj4. volt nmlkj

The charge possessed by 6.25 x 1018 electrons equals one:

1. ampere nmlkj2. coulomb nmlkj3. joule nmlkj4. volt nmlkj

1. current nmlkj2. power nmlkj3. resistance nmlkj4. voltage nmlkj

Page 37 of 205


186.Joule per coulomb is the definition of a:

187.The amount of resistance is expressed in:

188.A current of 0.04 A could also be expressed as:

189.In addition to Ohm’s law, solving multiple-load circuits requires the use of:

1. watt nmlkj2. ohm nmlkj3. coulomb nmlkj4. volt nmlkj

1. watts nmlkj2. ohms nmlkj3. coulombs nmlkj4. volts nmlkj

1.

4 x 10-3 A

nmlkj

2. Maximizeaza

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nmlkj

3. 40 mA nmlkj4. 0.4 kA nmlkj

Page 38 of 205


190.The formula that can be used in any type of circuit is:

191.

Maximizeaza

1. Coulomb’s laws nmlkj2. Ampere’s laws nmlkj3. Kirchhoff’s laws nmlkj4. none of the above nmlkj

1.

IT = IR1 + IR2 + IR3 + etc.

nmlkj

2.

RT = RR1 + RR2 + RR3 + etc.

nmlkj

3.

PT = PR1 + PR2 + PR3 + etc.

nmlkj

4. none of the above nmlkj







1. a series circuit nmlkj2. a parallel circuit nmlkj

Page 39 of 205


192.

193.A condition that is necessary for maximum power transfer is:

194.The smallest resistance always dissipates the most power in:

4. both B and C above nmlkj

IR1 is always less than IT in:

1. a series circuit nmlkj2. a parallel circuit nmlkj3. a series-parallel circuit nmlkj4. both A and C above nmlkj

1.

Rsource = Rload

nmlkj

2.

Rsource = 10Rload

nmlkj

3.

10 x Rsource = Rload

nmlkj

4.

100 x Rsource = Rload

nmlkj

1. a series circuit nmlkj2. a parallel circuit nmlkj3. a series-parallel circuit nmlkj4. both b and c above nmlkj

Page 40 of 205


195.The largest resistance always drops the most voltage in:

196.

197.

1. a series circuit nmlkj2. a parallel circuit nmlkj3. a series-parallel circuit nmlkj4. both a and c above nmlkj

For the circuit below, PT is equal to:

1. 40 mW nmlkj2. 0.04W nmlkj3. 320 mW nmlkj4. none of the above nmlkj

For the circuit below:

1.

RT = 1 k Ω

nmlkj

2. nmlkj

Page 41 of 205


198.

199.Solving simultaneous equations requires:

200.The technique that can’t be used on single-source circuits is:

PR2 = 533 mW

3.

PT = 1.6 W

nmlkj

4. all of the above nmlkj

For the circuit below:

1.

IR3 = 4 mA

nmlkj

2.

IR2 = 8 mA

nmlkj

3. neither of the above nmlkj4. both of the above nmlkj

1. no more than two independent equations nmlkj2. at least three independent equations nmlkj3. as many independent equations as there are unknown variables nmlkj4. one fewer independent equations than unknown variables nmlkj

Page 42 of 205


201.The technique that can’t be used on multiple-source circuits is:

202.The technique that uses only series-parallel rules and procedures is:

203.The technique that may not determine all current and voltage values is

204.The technique that may require the use of another technique before it can be applied is:

205.The technique that requires only one calculation to determine the new load current when the load resistance is changed is:

1. loop equations nmlkj2. superposition theorem nmlkj3. Norton’s theorem nmlkj4. none of the above nmlkj

1. loop equations nmlkj2. superposition theorem nmlkj3. Thevenin’s theorem nmlkj4. none of the above nmlkj



1. loop equations nmlkj2. superposition theorem nmlkj3. Thevenin’s theorem nmlkj4. all of the above nmlkj

Page 43 of 205


206.The technique that may yield a negative value of current is:

207.


1. loop equations nmlkj2. superposition theorem nmlkj3. Norton’s theorem nmlkj4. all of the above nmlkj

Determine the value of IR2, IR3, and VR2 in the circuit below.

1.

IR2 = 1.25 mA, IR3 = 1.75 mA, VR2 = 3 V

nmlkj

2.

IR2 = 2.05 mA, IR3 = 1.99 mA, VR2 = 3 V

nmlkj

3.

IR2 = 3.98 mA, IR3 = 2.09 mA, VR2 = 4 V

nmlkj

4. nmlkj

Page 44 of 205


208.The direction of the flux around a conductor can be determined by:

209.The invisible lines of force around a magnet are called:

210.When the currents in two parallel conductors are in the same direction:

211.The most magnetic element is:

212.Increasing the space between the turns in a coil:

IR2 = 7.90 mA, IR3 = 3.00 mA, VR2 = 5 V

1. the left-hand rule and the polarity of the applied voltage nmlkj2. the left-hand rule and the direction of the current flow nmlkj3. either of the above nmlkj4. neither of the above nmlkj

1. magnetic flux nmlkj2. mmf nmlkj3. poles nmlkj4. reluctance nmlkj

1. the flux produced by one conductor cancels the flux from the other conductor nmlkj2. the conductors attract each other nmlkj3. the conductors repel each other nmlkj4. none of the above nmlkj

1. cobalt nmlkj2. nickel nmlkj3. silicon nmlkj4. iron nmlkj

1. increases the flux at the poles nmlkj

Page 45 of 205


213.The flux associated with a temporary magnetic material after the material is removed from a magnetic field is called:

214.The unit used to specify flux density is the:

215.The unit for permeability is the:

216.Magnetic shields are usually made from:

217.The most common waveform for ac is the:

2. decreases the flux at the poles nmlkj3. does not change the flux at the poles nmlkj4. none of the above nmlkj

1. resident magnetism nmlkj2. retained magnetism nmlkj3. induced magnetism nmlkj4. none of the above nmlkj

1. ampere-turn nmlkj2. tesla nmlkj3. weber nmlkj4. none of the above nmlkj

1. ampere-turn nmlkj2. tesla nmlkj3. weber nmlkj4. none of the above nmlkj

1. nonmagnetic materials nmlkj2. temporary magnetic materials nmlkj3. permanent magnetic materials nmlkj4. none of the above nmlkj

Page 46 of 205


218.One cycle of an ac waveform:

219.The rate at which cycles are produced is called the:

220.One cycle per second is equal to:

221.Unless otherwise specified, ac values are assumed to be:

222.One cycle spans:

1. triangle wave nmlkj2. sawtooth wave nmlkj3. square wave nmlkj4. sine wave nmlkj

1. has two alternations nmlkj2. reverses polarity once nmlkj3. neither of the above nmlkj4. both of the above nmlkj

1. cycle nmlkj2. frequency nmlkj3. period nmlkj4. rapidity nmlkj

1. a hertz nmlkj2. a period nmlkj3. an alternation nmlkj4. none of the above nmlkj

1. effective values nmlkj2. average values nmlkj3. peak values nmlkj4. none of the above nmlkj

1. 90 electrical degrees nmlkj

Page 47 of 205


223.The phase voltages in a three-phase system are separated by:

224.When the T = 2 ms, f will equal:

225.The f of an eight-pole generator rotating at 600 r/min will be:

226.In a wye-connected three-phase system, the relationship between the magnitudes of the phase and the line voltages is:

2. 120 electrical degrees nmlkj3. 180 electrical degrees nmlkj4. 360 electrical degrees nmlkj

1. 90 electrical degrees nmlkj2. 120 electrical degrees nmlkj3. 180 electrical degrees nmlkj4. 360 electrical degrees nmlkj

1. 0.5 Hz nmlkj2. 50 Hz nmlkj3. 500 Hz nmlkj4. none of the above nmlkj

1. 4800 Hz nmlkj2. 2400 Hz nmlkj3. 80 Hz nmlkj4. 40 Hz nmlkj

1.

1.732Vline = Vphase

nmlkj

2.

Vline = 1.732 Vphase

nmlkj

Page 48 of 205


227.The particles that can be found within an atom are:

228.The smallest negative particle of electricity is called:

229.The weight of a proton is:

230.A negatively charged ion has:

3.


nmlkj

4.


nmlkj

1. electrons and protons. nmlkj2. protons and neutrons. nmlkj3. neutrons, protons, and electrons. nmlkj4. electrons, molecules, and protons. nmlkj

1. an electron. nmlkj2. a neutron. nmlkj3. an element. nmlkj4. a proton. nmlkj

1. much greater than that of an electron. nmlkj2. much less than that of an electron. nmlkj3. much less than that of a neutron. nmlkj4. much greater than that of a neutron. nmlkj

1. more electrons that protons. nmlkj2. fewer electrons than protons. nmlkj3. a complete outer electron shell. nmlkj4. an incomplete outer electron shell. nmlkj

Page 49 of 205


231.The outer-shell electrons of an atom:

232.Electrons are held in their orbital path by:

233.A good insulator of electricity is a substance that:

234.A transistor can be classified as:

235.A continuity tester is basically:

1. are called valence electrons. nmlkj2. are set free most easily. nmlkj3. become free electrons once they are set free. nmlkj4. all of these nmlkj

1. centrifugal forces counterbalancing attraction forces. nmlkj2. centrifugal forces only. nmlkj3. attraction forces only. nmlkj4. unlike electrical forces. nmlkj

1. is used to conduct an electric current. nmlkj2. is a metal. nmlkj3. has 1, 2, or 3 valence electrons. nmlkj4. is used to prevent the flow of electrons. nmlkj

1. a conductor. nmlkj2. an insulator. nmlkj3. a pure semiconductor. nmlkj4. a specially-treated semiconductor. nmlkj

1. a series circuit consisting of a battery, switch, and test leads. nmlkj2. a parallel circuit consisting of a battery, light bulb, and test leads. nmlkj3. a parallel circuit consisting of a battery, switch, and test leads. nmlkj4. a series circuit consisting of a battery, light bulb, and test leads. nmlkj

Page 50 of 205


236.A continuity tester is used to check a fuse. When the fuse is connected across the test leads, a blown fuse is indicated when:

237.Static electricity is:

238.When a hard rubber rod and a piece of fur are rubbed together, the fur gives up electrons to the rubber rod. As a result:

239.The law of electric charges states:

240.Current electricity:

1. the lamp comes on with full brightness. nmlkj2. the lamp comes on with approximately half the normal brightness. nmlkj3. the lamp does not come on at all. nmlkj4. either a or b nmlkj

1. the same as alternating current. nmlkj2. the same as direct current. nmlkj3. an electrical charge in motion. nmlkj4. an electrical charge at rest. nmlkj

1. the fur and rod become positively charged. nmlkj2. the fur and rod become negatively charged. nmlkj3. the rod becomes positively charged. nmlkj4. the rod becomes negatively charged. nmlkj

1. like charges can neither repel nor attract. nmlkj2. like charges repel, unlike charges attract. nmlkj3. unlike charges can neither repel nor attract, whereas like charges can both repel and attract. nmlkj4. unlike charges repel, like charges attract. nmlkj

1. is an electric charge in motion. nmlkj2. can be classified as being AC. nmlkj3. can be classified as being DC. nmlkj4. all of these

Page 51 of 205


241.When a charge is transferred without direct physical contact, this is known as charging by:

242.When an alternating current power source is connected to a circuit, it produces a current that:

243.Voltage is produced in a battery by means of:

244.A device that produces a voltage when put under pressure is:

245.Large amounts of electricity are usually produced using:

nmlkj

1. induction. nmlkj2. conduction. nmlkj3. deduction. nmlkj4. friction. nmlkj

1. changes in direction, but not in magnitude. nmlkj2. changes in magnitude, but not in direction. nmlkj3. does not change in magnitude or direction. nmlkj4. changes in both direction and magnitude. nmlkj

1. heat. nmlkj2. light. nmlkj3. a chemical reaction. nmlkj4. a solar cell. nmlkj

1. a battery. nmlkj2. a generator. nmlkj3. a solar cell. nmlkj4. a crystal. nmlkj

1. a battery. nmlkj2. a solar cell. nmlkj

Page 52 of 205


246.In the battery, or voltaic cell, electrons are transferred from one electrode to the other. The electrode that gains electrons is:

247.Technician A says that when taking measurements with a voltmeter and an ammeter, the meters are both connected into the circuit in the same way. Technician B says the voltmeter is connected in series and the ammeter is connected in parallel. Who is correct?

248.The force that causes the flow of electrons through a conductor is known as:

249.The unit of measurement for the difference of potential between two points is:

250.An electric toaster is rated for 220 V and 10 A. Its power rating would be:

3. a thermocouple. nmlkj4. a generator. nmlkj

1. the negative terminal. nmlkj2. the positive terminal. nmlkj3. the electrolyte. nmlkj4. both a and c nmlkj


1. the power. nmlkj2. the current. nmlkj3. the voltage. nmlkj4. the resistance nmlkj

1. the volt nmlkj2. the ampere. nmlkj3. the PD. nmlkj4. the ohm nmlkj

Page 53 of 205


251.Which of the following is an example of a voltage source?

252.In a basic electrical circuit, the part that stores electric energy or changes it into other forms is:

253.Electrical conductors:

254.Which of the following is an example of a load?

255.Which of the following is classified as a protective device?

1. 2200 W nmlkj2. 2200 Wh nmlkj3. 2200 kWh nmlkj4. 2200 J nmlkj

1. a battery nmlkj2. a light bulb nmlkj3. a switch nmlkj4. copper wire conductors nmlkj

1. the load. nmlkj2. the source. nmlkj3. the conductor(s). nmlkj4. the switch. nmlkj

1. have high resistance. nmlkj2. use most of the energy available from the source. nmlkj3. complete the electron path from the source to the load. nmlkj4. all of these nmlkj

1. an electrical wall outlet nmlkj2. a hair dryer nmlkj3. a pushbutton nmlkj4. an extension cord nmlkj

Page 54 of 205


256.A switch would be classified as:

257.A poorly made electrical connection:

258.For practical purposes, all the circuit resistance is considered to be contained in:

259.The purpose of the energy source is to:

260.A fuse is used to:

1. a pushbutton nmlkj2. a fuse nmlkj3. a circuit breaker nmlkj4. both b and c nmlkj

1. a control device nmlkj2. a protective device. nmlkj3. a load device. nmlkj4. a voltage source. nmlkj

1. has a much higher-than-normal resistance. nmlkj2. can produce excessive heat when normal current flows through the circuit. nmlkj3. can reduce the total energy normally available for the load. nmlkj4. all of these nmlkj

1. the load device. nmlkj2. the conductors or wires. nmlkj3. the control device. nmlkj4. the protective device. nmlkj

1. protect circuit wiring and equipment. nmlkj2. start, stop, or vary the electron flow. nmlkj3. supply the voltage required to move the free electrons nmlkj4. all of these. nmlkj

1. protect circuit wiring and equipment. nmlkj

Page 55 of 205


261.Which of the following electrical diagrams is easiest to read?

262.A string of lamps is connected in parallel to a voltage source. If one lamp burns out, all the other lamps:

263.A string of lamps are connected in series to a voltage source. This connection would result in:

264.An AND-type control circuit consists of switches connected in:

265.If a circuit is constructed to allow the electrons to follow only one possible path, the circuit is called:

2. allow only currents within safe limits to flow. nmlkj3. automatically open the circuit when a higher current flows. nmlkj4. all of these. nmlkj

1. pictorial nmlkj2. wiring nmlkj3. perspective nmlkj4. schematic nmlkj

1. will go out. nmlkj2. will get brighter. nmlkj3. will not be affected. nmlkj4. will get dimmer. nmlkj

1. two voltage paths. nmlkj2. one voltage path nmlkj3. one current path. nmlkj4. two current paths. nmlkj

1. parallel. nmlkj2. parallel and series combination. nmlkj3. series. nmlkj4. series and parallel combination. nmlkj

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266.Two switches are connected to control a lamp. A ____ can be used to show how the switches work the lamp.

267.Replacing a fuse with one of a higher current rating can cause:

268.One of the factors involved in an electric shock is body resistance. Which of the following statements about body resistance is not true?

269.Generally, any voltage above ____ V is considered dangerous.

270.The severity of an electric shock increases with:

1. a series-parallel circuit. nmlkj2. an open circuit. nmlkj3. a series circuit nmlkj4. a parallel circuit. nmlkj

1. truth table nmlkj2. wiring sequence chart nmlkj3. block diagram nmlkj4. all of these nmlkj

1. lights in a house to flicker. nmlkj2. a short circuit. nmlkj3. wiring to overheat. nmlkj4. all of these nmlkj

1. The higher the body resistance, the greater the potential shock hazard. nmlkj2. The lower the body resistance, the greater the potential shock hazard. nmlkj3. The wetter the skin, the greater the potential shock hazard. nmlkj4. The drier the surface that a person is standing on, the greater the body-to-surface electrical

resistance. nmlkj

1. 9 nmlkj2. 48 nmlkj3. 110 nmlkj4. 220 nmlkj

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271.Resistance wire is designed primarily to convert electricity energy into:

272.When a resistor has a 2-W rating, this means that it:

273.Which resistor would you choose if you were asked to pick a resistor to use on a printed-circuit board circuit in which a large number of identical resistors were required?

274.Which of these variable resistors would most likely be used to control current in a higher power-level circuit?

1. an increase in voltage levels. nmlkj2. an increase in body current flow. nmlkj3. a decrease in body resistance. nmlkj4. all of these nmlkj

1. sound. nmlkj2. heat nmlkj3. mechanical energy nmlkj4. magnetism. nmlkj

1. can safely dissipate 2 W, or less, of power. nmlkj2. always dissipates exactly 2 W of power. nmlkj3. always provides 2 W of power. nmlkj4. all of these nmlkj

1. precision resistor nmlkj2. resistor network nmlkj3. wire-wound resistor nmlkj4. trim pot nmlkj

1. rheostat nmlkj2. trimmer potentiometer nmlkj3. nonlinear potentiometer nmlkj4. linear potentiometer nmlkj

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275.

276.The symbol for the prefix micro (metric measure) is:

277.

A voltage divider is formed by connecting a 6-kΩ resistor and a 2-kΩ resistor in series across a 20-V source. The voltage drop across each resistor would be, respectively:

1. 15 V and 5 V nmlkj2. 8 V and 12 V. nmlkj3. 6 V and 4 V. nmlkj4. 4 V and 6 V. nmlkj

1. m. nmlkj2. M nmlkj3.

µ

nmlkj

4. mic nmlkj

A 470,000 Ω resistor may be designated as:

1.

47 MΩ

nmlkj

2.

470 kΩ

nmlkj

3. nmlkj

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278.Converting 1 mA to its base unit produces:

279.A voltage of 0.48 V can be expressed as:

280.Ohm's law states that:

281.Technician A says that in a electrical circuit, voltage can exist without current. Technician B says that current cannot exist without voltage. Who is correct?

47 kΩ

4.

4,7 MΩ

nmlkj

1. 0.1 A. nmlkj2. 0.001 A nmlkj3. 10,000 A nmlkj4. 100,000 A. nmlkj

1. 4800 mV. nmlkj2. 480 mV. nmlkj3. 48 mV. nmlkj4. 4.8 mV. nmlkj

1. current is directly proportional to the resistance and inversely proportional to the voltage. nmlkj2. voltage is directly proportional to the current and inversely proportional to the resistance. nmlkj3. current is directly proportional to the voltage and inversely proportional to the resistance nmlkj4. voltage is directly proportional to the resistance and inversely proportional to the current. nmlkj

1. Technician A only nmlkj2. Technician B only nmlkj3. both Technician A and Technician B nmlkj

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282.

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283.

284.What is the resistance of a soldering iron element that conducts a current of 4 A when connected to a 120-V electric outlet?

4. neither Technician A nor Technician B nmlkj







1. 16 A nmlkj2. 18 A nmlkj3. 9 A nmlkj4. 12 A nmlkj

The current flowing through a 72 Ω resistor is measured and found to be 0.5 A. How much voltage is being applied across the resistor?

1. 90 V nmlkj2. 9 V nmlkj3. 360 V nmlkj4. 36 V nmlkj

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285.

286.A series circuit has:

287.In a series circuit, the amount of voltage each load receives is:

288.Three resistors (R1, R2, and R3) are connected in series to a 120-V source. The values of V1 and V3 are measured and found to be 42 V and 8 V, respectively. The value of V2 would then be:

1. 480 ohm nmlkj2. 360 ohm nmlkj3. 160 ohm nmlkj4. 30 ohm nmlkj

If a voltage of 3 V is applied across a resistor of 9 Ω how many watts of power does the resistor dissipate?

1. 27 W nmlkj2. 9 W nmlkj3. 3 W nmlkj4. 1 W nmlkj

1. one pathway for current flow. nmlkj2. two pathways for current flow nmlkj3. three pathways for current flow. nmlkj4. as many pathways for current flow as there are loads connected in series nmlkj

1. the same as the applied voltage. nmlkj2. inversely proportional to the resistance value of the load. nmlkj3. directly proportional to the resistance value of the load. nmlkj4. determined by its position in the series string. nmlkj

1. 40 V nmlkj

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289.

2. 24 V nmlkj3. 70 V nmlkj4. 56 V nmlkj

How much resistance R1 must be added in series with a 400 Ω R2 to limit the current to 0.25 A with 120 V applied?

1. Maximizeaza







nmlkj

2. Maximizeaza







nmlkj

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290.

291.

3. Maximizeaza







nmlkj

4.

80 Ω

nmlkj

Resistors R1 - 8 kΩ, R2 - 4 kΩ, R3 - 6 kΩ, and R4 - 2 kΩ are connected in series to a voltage source. Which resistor will dissipate the most power?

1. R1 nmlkj2. R2 nmlkj3. R3 nmlkj4. R4 nmlkj

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292.A string of twelve holidy lamps is designed to be connected in series to a 120-V source. If one of the lamps burned out and was shorted from the circuit, the operating voltage across each of the other eleven lamps would be:

293.Which resistor of a series circuit receives the largest voltage drop?

294.The polarity of the voltage drop across a resistor depends on:

295.Two voltage sources are connected series-opposing. Technician A says the two voltages are added to obtain the total equivalent voltage. Technician B says the equivalent voltage is given the

Three resistors with values of 1 kΩ, 5 kΩ, and 3 kΩ, respectively, are connected in series with a fourth resistor of unknown value. The applied voltage is 120 V and the current flow is 5 mA. What is the resistance value of the unknown resistor?

1. 15 kOhm nmlkj2. 8 kOhm nmlkj3. 4.5 kOhm nmlkj4. 3.2 kOhm nmlkj

1. 10.9 V nmlkj2. 20 V nmlkj3. 32 V nmlkj4. 48 V nmlkj

1. the first resistor in the string nmlkj2. the last resistor in the string nmlkj3. the one with the least resistance nmlkj4. the one with the most resistance nmlkj

1. its resistance value. nmlkj2. its position in the circuit. nmlkj3. the direction of current flow through it. nmlkj4. all of these nmlkj

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polarity of the greater voltage. Who is correct?

296.

297.With two resistances connected in parallel, if each dissipates 5 W, the total power supplied by the voltage source equals:

298.With two resistances connected in parallel:

299.


With 24 V applied across five 6 Ω resistors in parallel, the total current equals ____.


1. 4 W nmlkj2. 6 W nmlkj3. 8 W nmlkj4. 10 W nmlkj

1. the current through each must be the same. nmlkj2. the voltage across each must be the same. nmlkj3. their combined resistance equals the sum of the individual values. nmlkj4. both b and c nmlkj

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300.A three-branch parallel resistor circuit is connected to a 6-V source. The branch currents are 1.2 A, 800 mA, and 250 mA, respectively. The total current is:

301.

Maximizeaza

Resistors of 10 Ω and 30 Ω are connected in parallel to a 120-V supply. The current flow through the 10 Ω resistor would be:


1. less than 1.2 A nmlkj2. less than 800 mA. nmlkj3. about 1050 mA. nmlkj4. about 2.25 A nmlkj







1. 100 Ohm nmlkj2. 150 Ohm nmlkj3. 200 Ohm nmlkj4. 250 Ohm nmlkj

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302.

303.The voltage across an open component in a parallel circuit is always equal to:

304.With a short in one of the branches of a parallel circuit:

305.Technician A says that in a parallel circuit, a shorted resistor shorts out the entire circuit. Technician B says this can burn out the power supply unless the circuit is protected by a fuse or a circuit breaker. Who is correct?

Four resistors, 1 kΩ each, are connected in parallel. This group is connected to a 9-V source. The current in the line leading to the group of resistors is:

1. 12 mA nmlkj2. 18 mA nmlkj3. 36 mA nmlkj4. 500 mA nmlkj

1. the source voltage nmlkj2. the dropped voltage. nmlkj3. the lowest circuit voltage. nmlkj4. zero. nmlkj

1. the voltage source is shorted out. nmlkj2. the voltage source will deliver its maximum current flow. nmlkj3. the total circuit resistance drops to near zero resistance. nmlkj4. all of these nmlkj


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306.

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307.

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Consider the circuit in Figure 1. The known voltages and currents are as indicated. Applying Kirchhoff's voltage and current laws, the value of the voltage drop across R2 would be:


Consider the circuit in Figure 2. The known voltages and currents are as indicated. Applying Kirchhoff's voltage and current laws, answer the following question. The value of the applied voltage source would be:

1. 28 V nmlkj2. 36 V nmlkj

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308.

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309.

Maximizeaza


The value of the voltage drop across R4 Figure 2 would be:


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310.

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The value of the current flow through R1 Figure 2 would be:

1. 9 mA nmlkj2. 6 mA nmlkj3. 1.5 mA nmlkj4. 15 mA nmlkj

.Answer the following question with reference to the series-parallel circuit in Figure 3.

1. 10 Ohm nmlkj2. 15 Ohm nmlkj3. 22.5 Ohm nmlkj4. 31 Ohm nmlkj

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311.

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312.

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The total power dissipated by the circuit in Figure 3 is:

1. 1440 W nmlkj2. 240 W nmlkj3. 360 mW nmlkj4. 240 mW nmlkj







1. 1.33 mA nmlkj

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313.

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314.

2. 1.5 mA nmlkj3. 12 mA nmlkj4. 2 mA nmlkj

The total current flow of the circuit in Figure 5 is:

1. 9 A nmlkj2. 30 A nmlkj3. 10 A nmlkj4. 1.5 A nmlkj

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315.

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The current flow through resistor R2 in Figure 5 is:


If resistor R1 in Figure 5 becomes short-circuited, the total resistance of the circuit will:

1. increase. nmlkj2. decrease. nmlkj3. be infinite. nmlkj4. be zero. nmlkj

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316.Three substances that are classified as magnetic materials are:

317.The lodestone is a natural form of a:

318.Soft iron is most suitable for use in a:

319.Artificial magnets can be produced by:

320.The magnetic force between two poles:

1. aluminum, steel, and copper. nmlkj2. gold, silver, and nickel. nmlkj3. steel, nickel, and cobalt. nmlkj4. wood, paper, and glass. nmlkj

1. temporary magnet. nmlkj2. permanent magnet nmlkj3. soft magnet. nmlkj4. heavy magnet. nmlkj

1. permanent magnet. nmlkj2. natural magnet. nmlkj3. temporary magnet. nmlkj4. magneto. nmlkj

1. a.placing a nonmagnetic material in the core of a coil and applying an AC voltage of the coil. nmlkj2. placing magnetic material in the core of a coil and applying a DC voltage to the coil. nmlkj3. placing a magnetic material in the core of a coil and applying an AC voltage to the coil. nmlkj4. placing a nonmagnetic material in the core of a coil and applying a DC voltage of the coil. nmlkj

1. is measured using a galvanometer. nmlkj2. is measured using a multimeter. nmlkj3. increases as the distance between the two poles decreases. nmlkj4. decreases as the distance between the two poles decreases. nmlkj

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321.Permanent horseshoe-shaped magnets:

322.A permanent ring magnet:

323.A material that acts as an insulator for magnetic flux is:

324.Which of the following is not assumed to be a characteristic of magnetic lines of force?

325.Which of these does not normally have a demagnetizing effect?

326.A DC current flow through a conductor will produce:

1. retain their magnetism longer than the bar type. nmlkj2. will not retain their magnetism as well as the bar type. nmlkj3. will not provide as strong a magnetic field as a bar magnet. nmlkj4. provide a much stronger magnetic field than a bar magnet of equal material. nmlkj

1. acts like two horseshoe magnets. nmlkj2. acts like two horseshoe magnets placed together with opposite poles touching. nmlkj3. has no designated poles. nmlkj4. both b and c nmlkj

1. glass. nmlkj2. aluminum. nmlkj3. soft iron nmlkj4. unknown today nmlkj

1. They travel most easily through air. nmlkj2. They form closed loops. nmlkj3. They repel each other. nmlkj4. They exit at the magnet's N-pole and enter at its S-pole. nmlkj

1. DC applied to a coil nmlkj2. AC applied to a coil nmlkj3. heat nmlkj4. mechanical vibration nmlkj

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327.The left-hand conductor rule is used for a current-carrying conductor to determine the:

328.Lines of force of two parallel conductors with current flows in opposite directions will:

329.If the electromagnet is operated with direct current, the polarity of its magnetic poles:

330.The advantage of a toroidal core over a straight core is that the toroid is:

331.If other factors remain constant, which of the following combinations of electric current and the number of turns in the coil produces the strongest electromagnet?

1. a magnetic field that acts in a clockwise direction. nmlkj2. a magnetic field that acts in a counter-clockwise direction. nmlkj3. a magnetic field that varies in direction. nmlkj4. either a or b nmlkj

1. a direction of the lines of force around the current-carrying conductor. nmlkj2. south pole of the magnet by the direction of the thumb. nmlkj3. flux density of a magnetic field. nmlkj4. direction of rotation of the poles. nmlkj

1. oppose each other to produce a weaker field. nmlkj2. aid each other to produce a stronger field. nmlkj3. tend to move together. nmlkj4. both a and c nmlkj

1. remains fixed. nmlkj2. constantly reverses. nmlkj3. is not affected by the polarity of the DC voltage source. nmlkj4. both b and c nmlkj

1. self-shielding. nmlkj2. cheaper to operate. nmlkj3. more compact. nmlkj4. easier to mount. nmlkj

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332.The magnetic circuit consists of:

333.

334.A solenoid can be classified as an electromagnet with:

1. 500 turns and 2 A nmlkj2. 700 turns and 2 A nmlkj3. 300 turns and 4 A nmlkj4. 100 turns and 10 A nmlkj

1. electrons traveling from the negative to the positive terminal. nmlkj2. molecular magnets traveling from the north pole to the south pole. nmlkj3. electrons spinning in the same direction. nmlkj4. lines of force travelling from the N pole to the S pole. nmlkj

Consider the following changes made to an electromagnet: (i) increasing the number of turns in the coil; (ii) using a copper core instead of an iron core; (iii) decreasing the current flow in the coil. The strength of the electromagnet is increased by:

1. (i) only. nmlkj2. (ii) only. nmlkj3. (iii) only. nmlkj4. (i) and (ii) only. nmlkj

1. an air core. nmlkj2. a copper core. nmlkj3. moveable brass core. nmlkj4. a moveable iron core. nmlkj

Page 78 of 205


335.Solenoids can be used to operate:

336.Generating stations are classified according to:

337.The cheapest and most environmentally-safe type of generating station is:

338.Which of the following converts the sun's energy directly into electrical energy?

339.Transmitting electrical energy from the generating station to the consumer usually takes place at:

1. valves. nmlkj2. latches. nmlkj3. switches. nmlkj4. all of these nmlkj

1. the type of voltage generated. nmlkj2. their location. nmlkj3. the method used to drive their generators. nmlkj4. high voltage or low voltage. nmlkj

1. a hydroelectric generating station. nmlkj2. a nuclear power generating station. nmlkj3. a coal power generating station. nmlkj4. a natural gas power generating station. nmlkj

1. steam turbine nmlkj2. water turbine nmlkj3. wind turbine nmlkj4. silicon wafer nmlkj

1. very high AC-voltage levels. nmlkj2. very high DC-voltage levels. nmlkj3. very low AC-voltage levels. nmlkj4. very low DC-voltage levels. nmlkj

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340.Electrical transmission power-line losses are kept to a minimum by:

341.The unit used to measure electric power is:

342.When a 12-V battery delivers 18.0 A of current the power supplied is:

343.What is the power rating of an electric dryer element which has a resistance of 7.2 Ohm and is rated for 240 V?

344.A wattmeter is connected:

1. using large-diameter conductors. nmlkj2. using a high voltage and a low current. nmlkj3. using a low voltage and a high current. nmlkj4. both a and c nmlkj

1. the volt. nmlkj2. the ampere. nmlkj3. the watt. nmlkj4. the watthour. nmlkj

1. 180 kW. nmlkj2. 180 W nmlkj3. 1.25 W. nmlkj4. 216 W. nmlkj

1. 1728 W nmlkj2. 33.3 kW nmlkj3. 7200 kW nmlkj4. 17.28 kW nmlkj

1. in series with the load. nmlkj2. in parallel with the load. nmlkj3. with the ammeter section in parallel and the voltmeter section in series with the load. nmlkj4. with the ammeter section in series and the voltmeter section in parallel with the load. nmlkj

Page 80 of 205


345.A wattmeter is connected into a circuit and the pointer moves in the reverse direction. The problem can be corrected by:

346.Technician A says electric energy is measured in joules. Technician B says it is measured in kilowatthours. Who is correct?

347.An electric lamp transforms electric energy into:

348.How much energy is consumed when a 2000-W electric device is left on for 1 h?

349.The amount of electric energy used for electric appliances depends on:

1. reversing the two voltmeter leads. nmlkj2. reversing the two ammeter leads. nmlkj3. reversing both the voltmeter and ammeter leads. nmlkj4. either a or b nmlkj


1. chemical energy. nmlkj2. light energy. nmlkj3. heat energy. nmlkj4. both b and c nmlkj

1. 2 kJ nmlkj2. 2000 kJ nmlkj3. 2000 kWh nmlkj4. 2 kWh nmlkj

1. the physical size of the appliance. nmlkj2. the length of time the appliance is used. nmlkj3. the amount of electric power required to make the appliance operate. nmlkj4. both b and c

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350.Which of the following electric devices has, on an average, the highest annual energy consumption?

351.Alternating current is current that:

352.Generating a voltage by rotating a coil at a constant rate through a magnetic field results in a voltage that:

353.The standard frequency of the AC voltage available from the electric outlet in your home is:

354.If a sine wave has a peak-to-peak voltage value of 60 V, what is the rms value?

nmlkj

1. a range nmlkj2. a clothes dryer nmlkj3. a dishwasher nmlkj4. an air conditioner nmlkj

1. operates from a voltage source that has a fixed polarity. nmlkj2. operates from a voltage source that has a constantly reversing polarity. nmlkj3. flows from negative to positive. nmlkj4. flows from positive to negative. nmlkj

1. varies in magnitude. nmlkj2. varies in polarity. nmlkj3. varies in frequency. nmlkj4. both a and b nmlkj

1. 220 V nmlkj2. 50 V nmlkj3. 50 Hz nmlkj4. 220 Hz nmlkj

1. 0 V nmlkj

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355.If a sine wave has a peak value of 220 V, what is the rms value?

356.For any given generator the output voltage varies:

357.In an automobile alternator the three-phase AC stator voltage is converted to DC using:

358.The value of inductance is expressed in ohms.

359.In AC circuits the ohmic value of resistive elements depends on the frequency of the AC.

2. 21.2 V nmlkj3. 37 V nmlkj4. 74 V nmlkj


1. directly with its speed and the strength of the magnetic field. nmlkj2. inversely with its speed and the strength of the magnetic field. nmlkj3. directly with its speed and inversely with the strength of the magnetic field. nmlkj4. directly with the strength of the magnetic field and inversely with its speed. nmlkj

1. slip rings. nmlkj2. diodes nmlkj3. a commutator. nmlkj4. a regulator. nmlkj



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360.

361.The capacitive voltage can be higher than the source voltage is a series RLC circuit.

362.The cut-off frequency determines if the filter is a low-pass or high-pass filter.

363.The total opposition to current flow in an AC circuit is called :

364.The true power in a resistance is measured in :

365.

A resistance of 6Ω in series with 14Ω of reactance results in an impedance of 20Ω .




1. Capacitance nmlkj2. Resistance nmlkj3. Impedance nmlkj4. Resonance nmlkj

1. Ohms nmlkj2. Watts nmlkj3. Volts nmlkj4. Amperes nmlkj

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366.

367.When a Norton equivalent circuit is converted to Thevenin equivalent circuit RTH will be equal to RN.

368.A Thevenin equivalent circuit represents an ideal (constant) voltage source.

369.

In a series resonant band-pass filter where: fr = 100 Hz, f1 = 95 Hz, f2 = 105 Hz, the bandwidth is _____.

1. 10 Hz nmlkj2. 10 kHz nmlkj3. 200 Hz nmlkj4. 20 Hz nmlkj

A series RLC circuit is _____ when XL is greater than XC.

1. resonant nmlkj2. capacitive nmlkj3. inductive nmlkj4. none of the above nmlkj



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370.Current is independent of load resistance for a current source.

371.Norton's theorem reduces a resistive network to an ideal current source and a parallel resistance.

372.If two currents are in opposing directions through a branch of a circuit, the direction of the net current will be the same as that of the smaller current.

373.

When VRL for many values of VL must be determined, a circuit should be thevenized.





What is the Norton resistance as viewed by RL for the circuit below?

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374.

375.

1. 3 Ohm nmlkj2. 6 A nmlkj3. 0.5 A nmlkj4. 5 V nmlkj

Find the Thevenin resistance, as viewed by RL, for the circuit drawn below.

1. 30 Ohm nmlkj2. 30 V nmlkj3. 25 Ohm nmlkj4. 25 V nmlkj

Find the Thevenin voltage, as viewed by RL, for the circuit drawn below.

1. 30 Ohm nmlkj

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376.

377.A trilight or dual filament lamp is rated for 40-60-100 W. This bulb would contain:

378.The best way to test an incandescent lamp filament is:

379.The resistance of a 200-W, 120-V incandescent lamp would be:

2. 30 V nmlkj3. 25 Ohm nmlkj4. 25 V nmlkj

What is the Norton current as viewed by RL for the circuit below?

1. 3 Ohm nmlkj2. 6 A nmlkj3. 0.5 A nmlkj4. 5 V nmlkj

1. one 40-W and one 60-W filament. nmlkj2. one 100-W and one 50-W filament. nmlkj3. two 50-W filaments. nmlkj4. two 75-W filaments. nmlkj

1. to shake it. nmlkj2. to check it for continuity with an ohmmeter. nmlkj3. to check it for voltage with a voltmeter. nmlkj4. to visually inspect it. nmlkj

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380.Recessed ceiling fixtures require special installation safety procedures because:

381.Which of the following is not an advantage of fluorescent lamps over the incandescent types?

382.The fluorescent bulb produces light by:

383.The instant-start fluorescent tube:

384.A cycling ballast that turns power OFF and ON is most likely caused by:

1. higher than that of a 40-W, 120-V incandescent lamp. nmlkj2. lower than that of a 40-W, 120-V incandescent lamp. nmlkj3. the same as that of a 40-W, 120-V incandescent lamp. nmlkj4. 30 Q. nmlkj

1. they operate at higher current values. nmlkj2. they operate at higher voltage values. nmlkj3. they have very poor ventilation. nmlkj4. they can become grounded very easily. nmlkj

1. lower initial cost nmlkj2. produce less heat during normal operation nmlkj3. produce more light per watt of power consumed nmlkj4. will last longer nmlkj

1. heating a filament to a white-heat temperature. nmlkj2. means of a chemical reaction within the tube. nmlkj3. means of an electron arc established between two cathodes. nmlkj4. means of magnet induction between two electrodes. nmlkj

1. has a single-pin connection at each end. nmlkj2. requires a very high starting voltage. nmlkj3. requires a bulkier and more expensive type of ballast. nmlkj4. all of these nmlkj

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385.Which of the following is not an advantage of high-intensity discharge lamps?

386.High-intensity discharge lamps:

387.In an ideal inductor:

388.Energy is stored in a capacitor by means of:

389.As applied to a capacitor, the word dielectric refers to:

1. an overheated ballast. nmlkj2. the fixture not being adequately grounded. nmlkj3. the tube pins making power contact. nmlkj4. the line voltage being too low. nmlkj

1. They operate at low current. nmlkj2. They have a very long life expectancy. nmlkj3. They have a high light efficiency. nmlkj4. They have a high watt output from a single fixture. nmlkj

1. operate without the use of a ballast. nmlkj2. operate ON and OFF very quickly. nmlkj3. operate at low brightness when first turned on. nmlkj4. both a and c nmlkj

1. current lags the voltage by 90?. nmlkj2. current leads the voltage by 90?. nmlkj3. current lags the voltage by 180?. nmlkj4. current leads the voltage by 180?. nmlkj

1. its electrolytic field. nmlkj2. its force field. nmlkj3. its magnetic field. nmlkj4. its electrostatic field. nmlkj

1. the conducting material of the capacitor. nmlkj

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390.Polarized fixed capacitors must be connected:

391.Which indication on an ohmmeter should you most likely expect when testing a good capacitor?

392.Approximately what percentage of the applied voltage does the capacitor charge to at the end of the first time constant?

393.A 50- F capacitor is connected to a 120-V, 60-Hz source. The capacitive reactance of this capacitor would be approximately ____ ohms.

394.In general, impedance has an effect on an AC circuit similar to:

2. the metal used as the plate. nmlkj3. the insulating material separating the plates. nmlkj4. the capacitance of the capacitor. nmlkj

1. in series only. nmlkj2. in parallel only. nmlkj3. with the positive lead of the capacitor connected to the positive lead of the circuit. nmlkj4. with the negative lead of the capacitor connected to the positive lead of the circuit. nmlkj

1. no pointer deflection at all nmlkj2. momentary upscale pointer deflection nmlkj3. full-scale deflection of pointer nmlkj4. midscale indication nmlkj

1. 70 percent nmlkj2. 63 percent nmlkj3. 33 percent nmlkj4. 15 percent nmlkj

1. 2650 nmlkj2. 265 nmlkj3. 53 nmlkj4. 2.65 nmlkj

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395.Impedance may be defined as:

396.Lagging power factor is often produced by:

397.A transformer is a device used to:

398.An iron core is used in a transformer to:

399.A step-down transformer is used to change:

1. frequency. nmlkj2. voltage. nmlkj3. current. nmlkj4. resistance. nmlkj

1. the total opposition to current flow in an AC circuit. nmlkj2. the total opposition to current flow in a DC circuit. nmlkj3. the total opposition offered by a capacitor to alternating current flow. nmlkj4. the total opposition offered by an inductor to alternating current flow. nmlkj

1. fluorescent lamp ballasts. nmlkj2. induction motor windings. nmlkj3. solenoid coils in relays. nmlkj4. all of these nmlkj

1. rectify voltages from AC to DC. nmlkj2. transfer electric energy by mutual induction. nmlkj3. convert mechanical energy into electric energy. nmlkj4. all of these nmlkj

1. reduce hysteresis loss. nmlkj2. eliminate eddy current losses. nmlkj3. ensure good magnetic linkage between windings. nmlkj4. reduce the counter-emf. nmlkj

Page 92 of 205


400.The transformer used with a certain model car set has 240 turns in its primary coil and 24 turns in its secondary coil. If the transformer is connected to a 120-V wall receptacle the secondary voltage output would be approximately:

401.Most transformers operate to transfer energy at an efficiency of about:

402.A certain transformer has a turns ratio of 1:1. The transformer is used for:

403.Power transformers are designed to operate:

404.Which of these would most likely be used to match a 4- speaker to a 400-- amplifier output?

1. high power to low power. nmlkj2. alternating current to direct current. nmlkj3. high voltage to low voltage. nmlkj4. high current to low current. nmlkj

1. 6-V AC. nmlkj2. 12-V AC. nmlkj3. 18-V AC. nmlkj4. 24-V AC. nmlkj

1. 25 percent. nmlkj2. 75 percent. nmlkj3. 80 percent. nmlkj4. 95 percent. nmlkj

1. impedance matching. nmlkj2. changing frequency. nmlkj3. isolation. nmlkj4. stepping-up voltage. nmlkj

1. from 60-Hz line frequency. nmlkj2. in the audio frequency range. nmlkj3. in the radio frequency range. nmlkj4. all of these nmlkj

Page 93 of 205


405.A transformer coil can be checked with an ohmmeter for:

406.The rated input and output voltages of a transformer are checked with a voltmeter. Technician A says a normal primary voltage reading and no secondary voltage reading is an indication of an open secondary coil. Technician B says it is normal for the transformer output voltage to be higher than specified if no load is connected to the output. Who is correct?

407.The purpose of a power supply is:

408.In a power-supply circuit the transformer can be used to:

1. audio impedance-matching resistor nmlkj2. IF transformer nmlkj3. current transformer nmlkj4. auto transformer nmlkj

1. continuity. nmlkj2. eddy currents. nmlkj3. overloads. nmlkj4. overheating. nmlkj


1. to amplify weak signals. nmlkj2. to rectify weak signals. nmlkj3. to convert the electrical input voltage to the proper type and value needed to operate circuits. nmlkj4. all of these nmlkj

1. step up voltages. nmlkj2. electrically isolate circuits. nmlkj3. supply a variable AC voltage. nmlkj4. all of these nmlkj

Page 94 of 205


409.A step-down transformer will have:

410.A step-up transformer will have:

411.A standard transformer can safely isolate a 120-V primary circuit from a 10-V secondary circuit because:

412.What is the output ripple frequency of a bridge rectifier?

413.The approximate DC voltage output of a full-wave rectifier is equal to:

1. more turns on the secondary than on the primary. nmlkj2. a higher primary than secondary voltage. nmlkj3. a higher primary than secondary current. nmlkj4. all of these nmlkj

1. less turns on the primary than on the secondary. nmlkj2. a higher secondary than primary voltage. nmlkj3. a lower secondary than primary current. nmlkj4. all of these nmlkj

1. the primary and secondary coils are connected in parallel with each other. nmlkj2. no physical electrical connection exists between the primary and secondary coils. nmlkj3. the primary and secondary coils are connected in series with each other. nmlkj4. the primary and secondary coils are connected so as to lower the input voltage. nmlkj

1. one-half the input frequency nmlkj2. twice the input frequency nmlkj3. the same as the input frequency nmlkj4. one-fourth the input frequency. nmlkj

1. the rms value of the peak output value. nmlkj2. the peak value of the output voltage. nmlkj3. 0.318 of the peak output voltage. nmlkj4. 0.637 of the peak output voltage.

Page 95 of 205


414.Which of the following components is commonly used as a filter device?

415.Increasing the capacitance of the filter capacitor will have what effect on the ripple amplitude?

416.The voltage regulation of a power supply refers to:

417.Voltage and current are in phase when the load contains:

418.Current and voltage will be 90 degrees out of phase when the load contains:

nmlkj

1. a transformer nmlkj2. a resistor nmlkj3. a capacitor nmlkj4. a diode nmlkj

1. ripple will increase nmlkj2. ripple will remain the same nmlkj3. ripple will double nmlkj4. ripple will decrease nmlkj

1. the rules applied when wiring it. nmlkj2. the specifications of the components used in wiring it. nmlkj3. the ability of a power supply to maintain a constant output voltage. nmlkj4. the ability of a power supply to withstand overloads. nmlkj

1. nothing but reactance nmlkj2. nothing but resistance nmlkj3. neither of the above nmlkj4. both of the above nmlkj

1. nothing but reactance nmlkj2. nothing but resistance nmlkj

Page 96 of 205


419.The magnitude and direction of an electrical quantity can be shown with:

420.Power is used by the

421.The unit for apparent power is the:

422.Current will lead voltage by 90 degrees when the load is:

423.The numerical value of the cos O when the load contains only resistance is:

3. neither of the above nmlkj4. both of the above nmlkj

1. a victor nmlkj2. a pure number nmlkj3. neither of the above nmlkj4. both of the above nmlkj

1. resistive part of a load nmlkj2. reactive part of the load nmlkj3. all parts of the load nmlkj4. none of the above nmlkj

1. apparent watt nmlkj2. apparent joule nmlkj3. apparent dissipation nmlkj4. voltampere nmlkj

1. pure capacitance nmlkj2. pure inductance nmlkj3. both inductance and resistance nmlkj4. none of the above nmlkj

1. zero nmlkj2. 0.707

Page 97 of 205


424.When the PF = 90%, the cos O is:

425.When P = 500 W, I = 6 A, and V = 120 V, the PF will be:

426.When I = 4 A, P =300 W, and V= 240 V, angle theta will be:

427.A capacitor consists of two conductive plates separated by a(n):

428.The base unit of capacitance is the:

nmlkj3. one nmlkj4. infinite nmlkj

1. one nmlkj2. 0.988 nmlkj3. 0.900 nmlkj4. unknown nmlkj

1. greater than 1.0 nmlkj2. negative nmlkj3. unknown nmlkj4. 0.69 nmlkj

1. 71.8grd nmlkj2. 77.0grd nmlkj3. 0.77grd nmlkj4. 3.2grd nmlkj

1. dielectric nmlkj2. insulator nmlkj3. neither of the above nmlkj4. both of the above nmlkj

1. farad

Page 98 of 205


429.Most electrolytic capacitors are:

430.The relative energy loss of a capacitor is specified by its:

431.In one time constant, a capacitor charges to:

432.In the circuit below, VC2 will be:

nmlkj2. tesla nmlkj3. ohm nmlkj4. none of the above nmlkj

1. ac capacitors nmlkj2. very high Q capacitors nmlkj3. polarized capacitors nmlkj4. none of the above nmlkj

1. quality rating nmlkj2. power factor rating nmlkj3. dissipation factor rating nmlkj4. any of the above nmlkj

1. the source voltage nmlkj2. 63.2 % of the source voltage nmlkj3. 63.2 % of the available voltage nmlkj4. none of the above nmlkj


Page 99 of 205


433.CT for the circuit in question 6 will be:

434.The reactance of a 0.022-uF capacitor at 500 Hz will be:

435.For the circuit below, XCT will be:

436.The energy stored in a 2000-uF capacitor when the capacitor is charged to 150 V is:

3. 80 V nmlkj4. none of the above nmlkj

1. 5 uF nmlkj2. 1.25 uF nmlkj3. 0.8 uF nmlkj4. none of the above nmlkj

1. 69 Ohm nmlkj2. 14.5 mOhm nmlkj3. 1450 Ohm nmlkj4. none of the above nmlkj

1. 1592 Ohm nmlkj2. 796 Ohm nmlkj3. 318 Ohm nmlkj4. 531 Ohm nmlkj

1. 22.5 kJ nmlkj2. 22.5 J nmlkj3. 45 J nmlkj

Page 100 of 205


437.Inductance opposes any change in:

438.According to Lenz?s law, the polarity of a cemf is such that the cemf always:

439.The base unit of inductance is the:

440.The dc resistance of an inductor is also known as its:

441.Arcing in switch contacts that control an inductive circuit:

4. 0.24 J nmlkj

1. reluctance nmlkj2. charge nmlkj3. current nmlkj4. voltage nmlkj

1. opposes the force that created it nmlkj2. opposes the source voltage nmlkj3. aids the source voltage nmlkj4. none of the above nmlkj

1. henry nmlkj2. tesla nmlkj3. weber nmlkj4. none of the above nmlkj

1. quality factor nmlkj2. ESR nmlkj3. ohmic resistance nmlkj4. none of the above nmlkj

1. only occurs when the contacts open nmlkj2. is caused by an inductive kick nmlkj3. both of the above

Page 101 of 205


442.The resistance of a conductor increases as frequency increases because of the:

443.The induced voltage in an inductor is called its:

444.The reactance of a 0.1-mH inductor at 2.1 MHz is:

445.If the effective resistance is 20 Ohm, the Q of a 2.5-mH inductor at 30 kHz is:

446.IT for the circuit below is:

nmlkj4. none of the above nmlkj

1. heating effect nmlkj2. skin effect nmlkj3. magnetizing effect nmlkj4. none of the above nmlkj

1. cemf nmlkj2. bemf nmlkj3. both of the above nmlkj4. neither of the above nmlkj

1. 2638 Ohm nmlkj2. 758 Ohm nmlkj3. 1.3 Ohm nmlkj4. none of the above nmlkj

1. 9.4 nmlkj2. 23.6 nmlkj3. 9420 nmlkj4. none of the above nmlkj

Page 102 of 205


447.The primary coil of a transformer:

448.Copper loss in a transformer is also called:

449.The portion of the primary flux that links with the secondary coil is specified by the:

450.An isolation transformer:

1. 398 mA nmlkj2. 265 mA nmlkj3. 159 mA nmlkj4. 6.4 mA nmlkj

1. must have fewer turns than the secondary coil nmlkj2. must have more turns than the secondary coil nmlkj3. must have the same number of turns as the secondary coil nmlkj4. none of the above nmlkj

1. V^2/R loss nmlkj2. I^2R loss nmlkj3. IV loss nmlkj4. none of the above nmlkj

1. permeability factor nmlkj2. cutting factor nmlkj3. coefficient of coupling nmlkj4. none of the above nmlkj

1. isolates its load from the power distribution system nmlkj

Page 103 of 205


451.The currents induced in the core of a transformer are called:

452.Hysteresis loss in a transformer is caused by:

453.When a transformer has 100% coupling:

454.One disadvantage of the autotransformer is:

455.A transformer can not be overloaded:

2. has equal primary and secondary voltages nmlkj3. is a type of power transformer nmlkj4. all of the above nmlkj

1. eddy currents nmlkj2. hysteresis currents nmlkj3. secondary currents nmlkj4. none of the above nmlkj

1. magnetic reluctance nmlkj2. low permeability nmlkj3. residual magnetism nmlkj4. magnetic saturation nmlkj

1. the turns ratio is equal to the voltage ratio nmlkj2. impedance matching occurs nmlkj3. it is 100% efficient nmlkj4. it has an air core nmlkj

1. it can only step up the voltage nmlkj2. it can only step down the voltage nmlkj3. it does not provide electrical isolation nmlkj4. none of the above nmlkj

1. without exceeding its power rating

Page 104 of 205


456.A 4-Ohm resistive load connected to a source by a transformer with a 9:1 turns ratio will appear to the source as a:

457.In a parallel RC circuit where R exceeds XC:

458.In a parallel RC circuit where XC exceeds R:

459.In a series RC circuit where R exceeds XC:

460.In a parallel RL circuit where R exceeds XL:

nmlkj2. while using a low PF load nmlkj3. unless the VA rating of one or more windings is exceeded nmlkj4. unless the sum of all winding currents exceeds the total current rating nmlkj

1. 324-Ohm resistive load nmlkj2. 324-Ohm inductive load nmlkj3. 36-Ohm resistive load nmlkj4. 36-Ohm inductive load nmlkj

1. IT will lag VT nmlkj2. Phi will be < 45grd nmlkj3. PC will be > PR nmlkj4. none of the above nmlkj

1. IT will lead VT nmlkj2. Phi will be > 45grd nmlkj3. PC will be > PR nmlkj4. none of the above nmlkj

1. IT will lag VT nmlkj2. Phi will be < 45grd nmlkj3. PC will be > PR nmlkj4. none of the above nmlkj

Page 105 of 205


461.In a series RL circuit where XL exceeds R:

462.In a parallel RCL circuit where XL = 250 , XC = 400 , and R =300 :

463.In a series RCL circuit:

464.What is the bandwidth of a circuit that is resonant at 470 kHz and has a Q of 90?

465.Determine Z and Phi for the circuit below.

1. IT will lag VT nmlkj2. Phi will be < 45grd nmlkj3. PL will be > PR nmlkj4. none of the above nmlkj

1. IT will lead VT nmlkj2. Phi will be < 45grd nmlkj3. PL will be > PR nmlkj4. none of the above nmlkj

1. IT will lead VT nmlkj2. Phi will be > 45grd nmlkj3. PT will = PR nmlkj4. all of the above nmlkj

1. both the inductive and the capacitive voltages can exceed the source voltage nmlkj2. the true power can equal the apparent power nmlkj3. angle theta can be zero nmlkj4. all of the above nmlkj

1. 1.338 Hz nmlkj2. 5.2 kHz nmlkj3. 90 kHz nmlkj4. 470 kHz nmlkj

Page 106 of 205


466.Determine the resonant frequency of a 270-uH inductor and a 220-pF capacitor.

467.Motors are not available in this size:

468.Motors are usually not rated for:

469.Voltage-rating tolerance for motors is typically:

1. 924.6 , 59.4 grd nmlkj2. 1.50 k , 89.0 grd nmlkj3. 2.52 k , 39.8 grd nmlkj4. 22.0 k , 19.9 grd nmlkj

1. 17.0 kHz nmlkj2. 540 kHz nmlkj3. 599 kHz nmlkj4. 653 kHz nmlkj

1. fhp nmlkj2. ihp nmlkj3. mihp nmlkj4. sfhp nmlkj

1. power factor nmlkj2. duty cycle nmlkj3. service factor nmlkj4. temperature nmlkj

1. +/- 1% nmlkj

Page 107 of 205


470.For motor-design, ambient temperature is usually considered to be:

471.With the highest class of insulation, a motor can operate at a temperature of:

472.Which of these motors is synchronous?

473.Which of these motors has the least starting torque?

474.Which of these motors has the most starting torque?

2. +/- 5% nmlkj3. +/- 10% nmlkj4. +/-15% nmlkj

1. 23grdC nmlkj2. 30grdC nmlkj3. 40grdC nmlkj4. 50grdC nmlkj

1. 105grdC nmlkj2. 130grdC nmlkj3. 155grdC nmlkj4. 180grdC nmlkj

1. permanent-capacitor nmlkj2. reluctance nmlkj3. shaded-pole nmlkj4. split-phase nmlkj

1. capacitor-starting nmlkj2. permanent-capacitor nmlkj3. shaded-pole nmlkj4. split-phase nmlkj

1. capacitor-starting

Page 108 of 205


475.Determine the power for a dc motor that develops 3 lb-ft of torque at 2500 r/min.

476.What is the synchronous speed of an eight-pole, 240-V, 50-Hz motor?

477.The meter movement most often used in analog multimeters is the:

478.The meter movement used in the analog wattmeters is the:

479.A rectifier can convert:

nmlkj2. permanent-capacitor nmlkj3. shaded-pole nmlkj4. split-phase nmlkj

1. 0.941 hp nmlkj2. 1.43 hp nmlkj3. 2.22 hp nmlkj4. 2.81 hp nmlkj

1. 750 r/min nmlkj2. 1250 r/min nmlkj3. 1600 r/min nmlkj4. 3600 r/min nmlkj

1. d'Arsonval movement nmlkj2. electrodynamometer movement nmlkj3. iron-vane movement nmlkj4. thermocouple movement nmlkj

1. d'Arsonval movement nmlkj2. electrodynamometer movement nmlkj3. iron-vane movement nmlkj4. thermocouple movement nmlkj

1. alternating current to pure direct current nmlkj

Page 109 of 205


480.The range of an analog ammeter is determined by:

481.The range of an analog voltmeter is determined by:

482.The sensitivity of a VOM is specified by its:

483.Testing for minute leakage current in motors, transformers, etc. is done with:

484.Digital meters measure inductance by measuring:

2. direct current to alternating current nmlkj3. alternating current to pulsating direct current nmlkj4. all of the above nmlkj

1. the value of the multiplier resistor nmlkj2. the value of the shunt resistor nmlkj3. neither of the above nmlkj4. both of the above nmlkj

1. the value of the multiplier resistor nmlkj2. the value of the shunt resistor nmlkj3. neither of the above nmlkj4. both of the above nmlkj

1. lowest current range nmlkj2. highest voltage range nmlkj3. Ohm/V rating nmlkj4. A/Ohm rating nmlkj

1. an insulation tester nmlkj2. a high-voltage tester nmlkj3. a high-resistance tester nmlkj4. none of the above nmlkj

1. the inductor's cemf

Page 110 of 205


485.Digital meters measure capacitance by measuring:

486.Digital meters measure frequency by:

487.Analog meters:

488.The multimeter:

489.

nmlkj2. the RL time constant nmlkj3. the rate of the current rise in the inductor nmlkj4. the mmf produced by the inductor nmlkj

1. the RC time constant nmlkj2. the charge required to charge the capacitor nmlkj3. the time required to charge the capacitor nmlkj4. the energy required to charge the capacitor nmlkj

1. measuring the slope of the rising waveform nmlkj2. measuring the slope of the falling waveform nmlkj3. measuring the period of the waveform nmlkj4. counting the cycles per unit of time nmlkj

1. make use of a digital display. nmlkj2. use a mechanical type of meter movement. nmlkj3. usually cost more than the digital type. nmlkj4. give a more accurate reading than the digital type. nmlkj

1. can measure voltage, current, or resistance. nmlkj2. is the most widely used of all test instruments nmlkj3. is a combination ammeter, voltmeter, and ohmmeter in one single, cased instrument. nmlkj4. all of these. nmlkj

Page 111 of 205


490.A DC analog voltmeter can be used to measure an AC voltage if:

491.An analog multimeter is connected to measure a DC voltage, and the needle reads below zero. The most likely cause is:

492.A milliammeter is designed measure:

A reading of 4.7 kΩ on the display of a digital multimeter indicates a resistance reading of:

1.

47000Ω

nmlkj

2.

4700Ω

nmlkj

3.

470Ω

nmlkj

4.

47Ω

nmlkj

1. the incoming AC voltage is rectified. nmlkj2. the incoming AC voltage is amplified. nmlkj3. an additional multiplier resistor is connected to the circuit. nmlkj4. an additional shunt resistor is connected to the circuit. nmlkj

1. loss of potential. nmlkj2. an incorrect meter setting. nmlkj3. a damaged needle. nmlkj4. reversed polarity. nmlkj

1. higher values of current than an ammeter does. nmlkj

Page 112 of 205


493.To zero set an analog-type ohmmeter, adjust the zero-set knob for a pointer reading of:

494.When using the ohmmeter as a continuity tester, an open circuit is indicated by:

495.Technician A says analog meters are more accurate than digital meters. Technician B says digital meters that use a light-emitting diode (LED) display have a longer battery life than those that use a liquid-crystal display (LCD). Who is correct?

496.Auto ranging is a feature of a multimeter that:

497.When using the oscilloscope you should avoid:

2. lower values of current than an ammeter does. nmlkj3. DC current only. nmlkj4. AC current only. nmlkj

1. infinity with the meter-test leads open. nmlkj2. infinity with the meter-test leads connected together nmlkj3. zero with the meter-test leads connected together. nmlkj4. zero with the meter-test leads open. nmlkj

1. a low-resistance reading. nmlkj2. a high-resistance reading. nmlkj3. an infinite-resistance reading. nmlkj4. a zero-resistance reading. nmlkj


1. automatically indicates the polarity of DC measurements nmlkj2. automatically adjusts the meter's measuring circuits to the correct range. nmlkj3. captures a reading and displays it from memory. nmlkj4. responds to the effective heating valve of an AC waveform. nmlkj

Page 113 of 205


498.The waveform displayed on the screen of the oscilloscope represents a plot of:

499.The AC/DC switch of an oscilloscope:

500.A signal displayed on the calibrated time base of the oscilloscope covers 1 cycle in 10 DIV with the TIME/DIV control set at 20 ms. The waveform frequency is:

501.Technician A says when connecting the test probe of a scope to a grounded circuit, the grounded conductor of the probe is connected to the grounded side of the circuit. Technician B says the scope should never be used to test a grounded circuit. Who is correct?

1. operating it for long periods of time. nmlkj2. turning it ON and OFF frequently. nmlkj3. operating it with a high-intensity spot displayed. nmlkj4. operating it with high-frequency signal circuits. nmlkj

1. voltage versus time. nmlkj2. voltage versus current. nmlkj3. current versus time. nmlkj4. current versus resistance. nmlkj

1. selects the AC signal input. nmlkj2. change AC-to-DC. nmlkj3. selects the DC signal. nmlkj4. selects how the input signal is coupled to the oscilloscope. nmlkj

1. 20 Hz. nmlkj2. 15 Hz. nmlkj3. 12 Hz. nmlkj4. 5 Hz. nmlkj


Page 114 of 205


502.A dual-trace oscilloscope:

503.A digital storage scope allows you to:

504.The control of a signal generator used to adjust the voltage value of the output signal is:

505.Technician A says that a function generator can do all of the things an audio generator can do. Technician B says the function generator is more compatible with solid-state electronic circuitry than the audio generator. Who is correct?

506.A DC power supply has a rated output of 3 W at 9 V. The maximum current rating of this power supply would be approximately:

1. has one set of controls to control two different traces. nmlkj2. has two sets of controls to control one trace. nmlkj3. can only be operated with two different signals applied to it. nmlkj4. has two sets of controls to control two different traces. nmlkj

1. display a signal. nmlkj2. store a signal. nmlkj3. analyze a signal. nmlkj4. all of these nmlkj

1. the vernier control. nmlkj2. the amplitude control. nmlkj3. the function selector. nmlkj4. the frequency selector. nmlkj


1. 1.8 A. nmlkj2. 45 A. nmlkj3. 250 mA. nmlkj

Page 115 of 205


507.Clasificarea sistemelor automate dupa structura lor

508.Clasificarea sistemelor automate dupa cantitatea de informatie apriori disponibila :

509.Clasificarea sistemelor automate dupa numarul de variabile de intrare si de iesire :

510.Clasificarea sistemelor automate dupa natura semnalelor prelucrate de sistemul automat :

511.Teoria sistemelor automate se ocupa cu :

4. 333 mA. nmlkj

1. sisteme automat conventionale; sisteme adaptive; nmlkj2. sisteme deschise; sisteme inchise; nmlkj3. sisteme monovariabile; sisteme multivariabile nmlkj4. sisteme automate continue; sisteme numerice; nmlkj




1. analiza functionala a sistemelor automate nmlkj2. corectia functionala si structurale a sistemelor automate nmlkj3. sinteza proiectarii sistemelor automate

Page 116 of 205


512.Functia de transfer pentru un element proportional

513.Functia de transfer pentru un element de ordinul I

514.Functia de transfer pentru un element de ordinul II

nmlkj4. a,b si c nmlkj

1.

sTKsH+

=1

)(

nmlkj

2.

ωωωξ 22

2

2)(

+⋅⋅⋅+

⋅=

s

KsHs

nmlkj

3.

KsH =)(

nmlkj

4. nici-o varianta nmlkj

1.

sTKsH+

=1

)(

nmlkj

2.

ωωωξ 22

2

2)(

+⋅⋅⋅+

⋅=

s

KsHs

nmlkj

3.

KsH =)(

nmlkj


Page 117 of 205


515.Functia de transfer pentru un element de ordinul III

1.

sTKsH+

=1

)(

nmlkj

2.

ωωωξ 22

2

2)(

+⋅⋅⋅+

⋅=

s

KsHs

nmlkj

3.

KsH =)(

nmlkj


1. Maximizeaza







nmlkj

2.

ωωωξ 22

2

2)(

+⋅⋅⋅+

⋅=

s

KsHs

nmlkj

3. nmlkj

Page 118 of 205


516.Timpul de raspuns al unui sistem este :

517.Circuitul din figura58 realizeaza functia

Maximizeaza

KsH =)(


1. timpul dintre momentul pornirii procesului pana cand marimea de iesire prezinta un maxim in evolutia ei

nmlkj

2. timpul dintre momentul pornirii procesului pana cand marimea de iesire prezinta un minim in evolutia ei

nmlkj

3. timpul dupa care valoarea absoluta a diferentei dintre marimea de iesire si valoarea ei de regim stationar devine mai mica si se mentine sub o anumita limita

nmlkj

4. timpul dintre momentul pornirii procesului pana cand acesta ia sfarsit nmlkj







1.

DCBAf +=

nmlkj

2.

DCBAf +=

nmlkj

3. AB+CD nmlkj

Page 119 of 205


518.Figura52 prezinta simbolul unui



4. AC+BD nmlkj

Figura 52

1. AND (SI) nmlkj2. NAND (SI negat) nmlkj3. EOR (SAU exclusiv) nmlkj4. ENOR (SAU exclusiv negat) nmlkj

Figura 53


Figura 54

1. AND (SI) nmlkj2. NAND (SI negat) nmlkj

Page 120 of 205





3. EOR (SAU exclusiv) nmlkj4. ENOR (SAU exclusiv negat) nmlkj

Figura 55


Figura 56

1. AND (SI) nmlkj2. NAND (SI negat) nmlkj3. OR (SAU) nmlkj4. NOR (SAU negat) nmlkj

Figura 57

1. AND (SI) nmlkj2. NAND (SI negat) nmlkj

Page 121 of 205


524.O memorie RAM este o memorie cu access de _________:

525.O memorie ROM este o memorie _________

526.Procesoarele sunt automate de ordinul ____

527.Arhitectura minimala a unui calculator este formata din :

528.Porturile de I/O sunt cuplate la procesor prin intermediul _______

3. OR (SAU) nmlkj4. NOR (SAU negat) nmlkj

1. citire nmlkj2. scriere nmlkj3. citire si scriere nmlkj4. initializare nmlkj

1. volatila nmlkj2. nevolativa nmlkj3. distructiva nmlkj

1. I nmlkj2. II nmlkj3. III sau mai mare nmlkj4. nu sunt automate nmlkj

1. procesor, memorie (RAM, ROM), bus de semnale, porturi de I/O nmlkj2. procesor, tastatura, monitor nmlkj3. monitor, tastatura nmlkj4. placa de baza, procesor, hard-disk, floppy nmlkj

1. firelor nmlkj2. panglici de semnale nmlkj3. bus-ului procesor de date, adrese si semnale de comanda si contro

Page 122 of 205


529.Procesorul este format din :

530.Microprocesorul Intel PIV este realizat in tehnologie

531.Indicatorul Z (zero -Flag) al RALU indica

532.Indicatorul CY (Carry -Flag) al RALU indica

533.Indicatorul S (S - Sign) al RALU

nmlkj

1. o unitate aritmetica RALU nmlkj2. o unitate de comenzi nmlkj3. un calculator nmlkj4. a si b nmlkj

1. LSI nmlkj2. MSI nmlkj3. VLSI nmlkj

1. Registrul acumulator este 0 nmlkj2. In urma unei operatii aritmetica sau logice rezultatul a fost nul nmlkj3. RALU a generat o eroare nmlkj4. Lipsa tensiune la RALU nmlkj

1. A aparut un transport de iesire din cel mai semnificativ bit al rezultatului in urma unei operatii aritmetice(logice)

nmlkj

2. Operatie cu operanzi invalizai in RALU nmlkj3. Valoare din registrul acumulator este negativa nmlkj4. Nu exista un astfel de fanion nmlkj

1. Bitul cel mai semnificativ al rezultatului ia valoarea 1 in urma unei operatii aritmetice sau logice gfedc2. Bitul cel mai semnificativ al acumulatorului este 1, in urma unei operatii de transfer gfedc3. Acumulatorul contine unnumar negativ gfedc

Page 123 of 205


534.Indicatorul H (H- Half carry) al RALU

535.Dimensiunea acumulatorului dintr-un microprocesor de 8 biti

536.Cati biti are un Byte

537.Cea mai mica unitatea informationala de transport

538.Unitatea de decodofocare a instructiunilor este ______ .

4. In urma unei operatii aritmetice intre numere cu semn, rezultatul este negativ gfedc

1. Nu exista un astfel de fanion nmlkj2. S-a realizat un transfer de la bitul 4 la bitul 5 in urma operatiei de scadere nmlkj3. S-a realizat un transfer de la bitul 7 la bitul 8 in urma operatiei de adunare nmlkj4. In urma unei operati logice nu a avut loc nici-un transfer nmlkj

1. 1 Byte nmlkj2. 16 biti nmlkj3. 1 bit nmlkj4. 2 Bytes nmlkj

1. 8 biti nmlkj2. 7 biti nmlkj3. 4 biti nmlkj4. 32 biti nmlkj

1. Byte nmlkj2. Word nmlkj3. bit nmlkj4. mol nmlkj

1. un circuit logic combinational (CLC) nmlkj2. un buffer nmlkj3. o memorie

Page 124 of 205


539.Contorul de adrese de program este numit ____ :

540.Procesorul acceseza programul executat curent din _______

541.Tastatura este ________

542.Denumirea primului ciclu masina:

543.Se aplica un semnal sinusoidal la intrarea unui amplificator functionand in clasa A. Unghiul de conductie al elementului amplificator este:

nmlkj4. un automat programabil nmlkj

1. Nu exista un astfel de registru nmlkj2. Registru de deplasare nmlkj3. PAC (Programm addressing Counter) nmlkj4. PC ( program counter) register nmlkj

1. dispozitivul de lucru cu operatorul nmlkj2. unitatea floppy nmlkj3. segmentul de memorie alocat programului ce se afla in executie nmlkj4. de la tastatura nmlkj

1. un dispozitiv absolut necesar pentru functionarea calculatorului nmlkj2. un set de butoane conectate la microprocero prin intermediul unui cablu nmlkj3. un periferic de interfata a calculatorului cu operatorul uman nmlkj

1. DOWNLOAD nmlkj2. RETRIVE DATA nmlkj3. FETCH nmlkj4. LOAD nmlkj

1. 360grd; nmlkj2. cuprins intre 180 grd si 360grd; nmlkj

Page 125 of 205


544.Se aplica un semnal sinusoidal la intrarea unui amplificator functionand in clasa AB. Unghiul de conductie al elementului amplificator este:

545.Se aplica un semnal sinusoidal la intrarea unui amplificator functionand in clasa B. Unghiul de conductie al elementului amplificator este:

546.Se aplica un semnal sinusoidal la intrarea unui amplificator functionand in clasa C. Unghiul de conductie al elementului amplificator este:

547.Figura27 prezinta:

Maximizeaza

3. 180grd nmlkj4. mai mic de 180grd; nmlkj

1. 360grd; nmlkj2. cuprins intre 180 grd si 360grd; nmlkj3. 180grd nmlkj4. mai mic de 180grd; nmlkj



Page 126 of 205



Maximizeaza

Figura 27

fu

au

UoUfUi U ε

+

-

1. schema bloc a unui amplificator cu reactie serie paralel nmlkj2. schema bloc a unui amplificator cu reactie serie serie nmlkj3. schema bloc a unui amplificator cu reactie paralel paralel nmlkj4. schema bloc a unui amplificator cu reactie paralel serie nmlkj

Figura 28

fy

az

UoIfIi U ε

1. schema bloc a unui amplificator cu reactie paralel serie nmlkj2. schema bloc a unui amplificator cu reactie serie paralel nmlkj3. schema bloc a unui amplificator cu reactie serie serie nmlkj4. schema bloc a unui amplificator cu reactie paralel paralel nmlkj

Page 127 of 205



Maximizeaza


Maximizeaza

Figura 29

fi

ai

IoIfIi U ε

1. schema bloc a unui amplificator cu reactie serie paralel nmlkj2. schema bloc a unui amplificator cu reactie serie serie nmlkj3. schema bloc a unui amplificator cu reactie paralel paralel nmlkj4. schema bloc a unui amplificator cu reactie paralel serie nmlkj

Figura 30

fz

ay

IoUfUi U ε

+

-

1. schema bloc a unui amplificator cu reactie serie paralel nmlkj

Page 128 of 205


551.In mod uzual amplificatorul electronic este definit cu ajutorul schemei bloc din figura 40. Marimea ²xi² reprezinta

552.Marimea ²xo² din figura 40 reprezinta

2. schema bloc a unui amplificator cu reactie serie serie nmlkj3. schema bloc a unui amplificator cu reactie paralel paralel nmlkj4. schema bloc a unui amplificator cu reactie paralel serie nmlkj

Figura 40

xoxi

a

1. valoarea instantanee a semnalului de intrare sau excitatie nmlkj2. valoarea instantanee a semnalului de iesire sau raspuns nmlkj3. amplificarea amplificatorului nmlkj4. impedanta de intrare nmlkj

Figura 40

xoxi

a


Page 129 of 205


553.Marimea ²a² din figura 40 reprezinta

Maximizeaza

554.Pentru amplificatorul transconductanta (transadmitanta)

555.in practica, sunt tranzistoarele din amplificatoarele in contratimp clasa B au jonctiunea baza - emitor prepolarizata direct astfel ca prin fiecare tranzistor sa circule un mic curent de repaus. Despre aceste amplificatoare se spune ca lucreaza in clasa AB. Prin aceasta se urmareste:








1. atat semnalul de excitatie cat si semnalului de raspuns reprezinta tensiuni nmlkj2. atat semnalul de excitatie cat si semnalului de raspuns reprezinta curenti nmlkj3. semnalul de excitatie este curent iar cel de raspuns tensiune nmlkj4. semnalul de excitatie este tensiune iar cel de raspuns curent nmlkj

1. marirea randamentului; nmlkj2. marirea amplificarii in putere nmlkj3. marirea benzii de trecere nmlkj4. reducerea distorsiunii de trecere nmlkj

Page 130 of 205


556.Variatoarele de tensiune continue sunt de obicei utilizate pentru:

557.Ce particularitate au invertoarele de comutatie fortata fara de cele cu comutatie naturala?

558.Ce rol are condensatorul din schema invertorului Wagner?

559.Ce caracteristica principala au invertoarele autonome de tensiune trifazate?

560.Variatorul de tensiune continua pentru patru cadrane, permite functionarea motorului de curent continuu astfel

1. alimentarea motoarelor asincrone nmlkj2. reglarea turatiilor masinilor electrice de curent continuu nmlkj3. alimentarea generatoarelor sincrone nmlkj4. reglarea turatiei motoarelor sincrone nmlkj

1. se alimenteaza direct de la retea nmlkj2. au sarcina rezistiva nmlkj3. au circuite auxiliare pentru blocarea dispozitivelor semi-conductoare nmlkj4. se alimenteaza prin intermediul unui transformator coborator de tensiune nmlkj

1. filtru nmlkj2. de a reduce armonicile de curent nmlkj3. de a mari tensiunea nmlkj4. de a furniza energia reactiva necesara comutatiei nmlkj

1. pot avea numai sarcina rezistiva nmlkj2. pot fi alimentate numai de la un transformator nmlkj3. sunt necomandate nmlkj4. blocarea tiristorului principal se realizeaza prin amorsarea unui alt tiristor principal nmlkj

1. in regim de motor, generator, in ambele sensuri de rotatie nmlkj2. in regim de motor nmlkj3. in regim de generator nmlkj4. in regim de frana nmlkj

Page 131 of 205


561.Un amplificator operational lucrand in bucla inchisa (cu reactie negativa) are amplificarea in tensiune intotdeauna:

562.Figura22 prezinta configuratia standard de stabilizator serie cu reactie. Blocul notat AE – amplificatorul de eroare - are rolul:

Maximizeaza

563.Figura22 prezinta configuratia standard de stabilizator serie cu reactie. Blocul notat UREF – tensiunea de referinta- are rolul

Maximizeaza

1. unitara nmlkj2. subununitara nmlkj3. determinata de reteaua de reactie nmlkj4. foarte mare nmlkj

+uRED

TRAE

uO

UREF

R2

+

-

R1

1. de a asigura reactia negativa nmlkj2. de a compara compara nivelul de tensiune cules de reteaua de reactie cu nivelul de tensiune al sursei

de referinta si a genera un semnal proportional cu diferenta dintre ele (amplifica semnalul de eroare). nmlkj

3. unei rezistente variabile, astfel incat tensiunea pe sarcina sa fie mentinuta constanta nmlkj4. de a asigura un nivel constant al tensiunii pe care o genereaza nmlkj

Page 132 of 205


564.Figura22 prezinta configuratia standard de stabilizator serie cu reactie. Rezistorii R1 si R2 au rolul

Maximizeaza










+uRED

TRAE

uO

UREF

R2

+

-

R1



3. unei rezistente variabile, astfel incat tensiunea pe sarcina sa fie mentinuta constanta nmlkj

Page 133 of 205


565.Figura22 prezinta configuratia standard de stabilizator serie cu reactie. TR – tranzistorul regulator - are rolul

Maximizeaza

566.Figura23 prezinta exemplul tipic de stabilizator serie cu reactie. Grupul R3, Dz are rolul

Maximizeaza

4. de a asigura un nivel constant al tensiunii pe care o genereaza nmlkj

+uRED

TRAE

uO

UREF

R2

+

-

R1

1. de a asigura reactia negativa nmlkj2. de a compara nivelul de tensiune cules de reteaua de reactie cu nivelul de tensiune al sursei de

referinta si a genera un semnal proportional cu diferenta dintre ele (amplifica semnalul de eroare). nmlkj


Page 134 of 205


567.Figura23 prezinta exemplul tipic de stabilizator serie cu reactie. Grupul R4, T1 are rolul

Maximizeaza

+uREDT1

Dz

R4

R3

T2

uO

iO

RL

R1

R2

1. de element regulator nmlkj2. de retea de reactie nmlkj3. de sursa de referinta nmlkj4. de amplificator de eroare nmlkj








Page 135 of 205


568.Figura23 prezinta exemplul tipic de stabilizator serie cu reactie. Tranzistorul T2 are rolul

Maximizeaza

569.Figura23 prezinta exemplul tipic de stabilizator serie cu reactie. Grupul R1, R2 are rolul

Maximizeaza

+uREDT1

Dz

R4

R3

T2

uO

iO

RL

R1

R2


+uREDT1

Dz

R4

R3

T2

uO

iO

RL

R1

R2

1. de element regulator nmlkj

Page 136 of 205


570.Figura25 prezinta un stabilizator cu dioda Zener imbunatatit. Cea de a doua celula de stabilizare are rolul de a

571.Figura26 prezinta un stabilizator cu dioda Zener imbunatatit. Tranzistorul T are rolul de a

Maximizeaza

2. de retea de reactie nmlkj3. de sursa de referinta nmlkj4. de amplificator de eroare nmlkj

Figura 25

uRED

iRED

Dz1

RB1

uL RL

RB2 iL

Dz2

1. mari curentul de iesire nmlkj2. micsora curentul de iesire nmlkj3. micsora factorul de stabilizare nmlkj4. mari factorul de stabilizare nmlkj

Figura 26

uRED

Dz

RB

T

uL RL

iL

Page 137 of 205


572.Pentru amplificatorul de tensiune

573.Pentru amplificatorul de curent

574.Pentru amplificatorul transrezistenta (tranzimpedanta)

575.Figura31 prezinta un amplificator cu reactie. in acest caz reactia este de tipul:

Maximizeaza

1. mari curentul de iesire nmlkj2. micsora curentul de iesire nmlkj3. micsora factorul de stabilizare nmlkj4. mari factorul de stabilizare nmlkj




Page 138 of 205



Maximizeaza

Figura 31

IS

RF

RC1RS

T2T1

T3

RC2 RL

1. serie paralel nmlkj2. serie serie nmlkj3. paralel paralel nmlkj4. paralel serie nmlkj

ES

+

- RF

RC1

RE1

RS T2T1

T3

RE2

RC2 RL


Page 139 of 205



Maximizeaza


Maximizeaza

Fi 33

ES

+

- RF

RC

RERL

RS T2T1


Figura 34

IS

RF

RC RE RLRS

T2T1

1. serie paralel nmlkj

Page 140 of 205


579.Figura41 prezinta schema echivalenta ideala pentru


2. serie serie nmlkj3. paralel paralel nmlkj4. paralel serie nmlkj

Figura 41

auUi

+

-

Ui Uo

1. amplificatorul de tensiune nmlkj2. amplificatorul de curent nmlkj3. amplificatorul transrezistenta nmlkj4. amplificatorul transconductanta nmlkj

Figura 42

aiIi

Ii Io


Page 141 of 205




583.Figura45 prezinta schema echivalenta uzuala pentru amplificatorul de tensiune. Despre rI si ro se poate spune:

Figura 43

azIi

+

-

Ii

Uo


Figura 44

ayUiUi

Io


Page 142 of 205




Figura 45

auUi

+

-

ro

riUi Uo

1. rI are valori foarte mici in timp ce r0 este foarte mare nmlkj2. rI are valori foarte mari in timp ce r0 este foarte mic nmlkj3. atat rI cat si ro sunt foarte mici nmlkj4. atat rI cat si ro sunt foarte mari nmlkj

Figura 46

aiIi

Ii Io

ri ro


Page 143 of 205



587.Castigul in tensiune al unui amplificator de tensiune se masoara in

Figura 47

azIi

+

-

ro

rπ

Ii

Uo


Figura 48

Ui ayUi

Io

rori


1. dB nmlkj

Page 144 of 205


588.Castigul in curent al unui amplificator de curent se masoara in

589.Amplificarea transimpedanta a unui amplificator transimpedanta se masoara in

590.Amplificarea transadmitanta a unui amplificator transadmitanta se masoara in

591.Considerand RB>>rz rezistenta de iesire a circuitului de stabilizare din figura 14, este aproximativ

2. Ohm nmlkj3. S nmlkj4. m nmlkj

1. dB nmlkj2. Ohm nmlkj3. S nmlkj4. m nmlkj



Page 145 of 205


592.Pentru etajul emitor comun prezentat in figura 15, considerand RC< Maximizeaza

Figura 14. Stabilizator cu diodã Zener.

uRED uL

iRED

RLDz

RB iLiZ

1. RB; nmlkj2. RB+rZ nmlkj3. rz nmlkj4. foarte mare nmlkj

Figura 15 Etaj emitor comun încãrcat la intrare ºi la ieºire

+EC

RC

Uo

RB1

RB2 RE

C1C2

CE

RG

+

-

Ein RL

1.

Lmu RgA −≅

nmlkj

2. Maximizeaza

nmlkj

Page 146 of 205


593.in prezenta unei reactii negative globale aplicata unui amplificator construit din mai multe etaje, valoarea raportului S/N (semnal/zgomot) masurata la iesire este:

594.Reactia negativa aplicata unui etaj de amplificare face ca valoarea raportului S/N (semnal/zgomot) masurata la iesire sa fie:







3.

; Lmu RgA ≅

nmlkj

4.

Cmu RgA ≅

nmlkj

1. mai mare; nmlkj2. neschimbata nmlkj3. mai mica nmlkj4. mult mai mare nmlkj

1. mai mare; nmlkj2. neschimbata nmlkj3. mai mica nmlkj4. mult mai mare nmlkj

Page 147 of 205


595.Randamentul unui amplificator ideal in clasa A (figura 16), avand sarcina cuplata prin transformator este:

Maximizeaza

596.in figura 17 este reprezentata schema de principiu a unui un amplificator in contratimp cu tranzistoare identice functionand in clasa B. Excursia maxima de tensiune este:

Maximizeaza

EC

RL

uIN

uOiIN

Tr

RB1

RB2 RE

C1

CE

1. 12,5%; nmlkj2. 25%; nmlkj3. 50%; nmlkj4. 1 nmlkj







Page 148 of 205


597.in figura 17 este reprezentat un amplificator in contratimp cu tranzistoare identice functionand in clasa B. Randamentul amplificatorului este aproximativ

Maximizeaza

598.Pentru etajul emitor comun prezentat in figura 15 rezistenta de intrare, in regim cvasistatic de semnal mic, este

Maximizeaza

1. 1/2 EC; nmlkj2. EC; nmlkj3. 2EC; nmlkj4. 4EC; nmlkj

Figura 4. Etaj de iesire in clasa B. Schema de principiu.

RLT2

-EC

+EC

uOuIN

T1

1. 25 %; nmlkj2. 50 %; nmlkj3. 78 %; nmlkj4. 88 %; nmlkj

Page 149 of 205


599.Pentru etajul emitor comun prezentat in figura 15 rezistenta de iesire, in regim cvasistatic de semnal mic, este:

Maximizeaza


+EC

RC

Uo

RB1

RB2 RE

C1C2

CE

RG

+

-

Ein RL

1.

Rin≅ rπ

nmlkj

2.

Rin≅

rπβ

nmlkj

3.

EBin RRR β≅

nmlkj

4.

Rin≅ Rc

nmlkj

Page 150 of 205


600.Pentru etajul emitor comun prezentat in figura 15 frecventa superioara de lucru este:

Maximizeaza


+EC

RC

Uo

RB1

RB2 RE

C1C2

CE

RG

+

-

Ein RL

1.

Rr

o ≅π

β

nmlkj

2.

Ro≅Rc

nmlkj

3.

β

≅ co

RR

nmlkj

4.

π≅ rRo

nmlkj

Page 151 of 205



+EC

RC

Uo

RB1

RB2 RE

C1C2

CE

RG

+

-

Ein RL

1.

ωH≤ω

β

nmlkj

2. Maximizeaza







nmlkj

3. Maximizeaza

nmlkj

Page 152 of 205


601.Pentru etajul colector comun prezentat in figura 18 amplificarea in tensiune U0/Ein, in regim cvasistatic de semnal mic, este:

Maximizeaza







4.

∞→ωH

nmlkj







1.

Lmu RgA −≅

nmlkj

2. nmlkj

Page 153 of 205


602.Pentru etajul colector comun prezentat in figura 18 rezistenta de intrare, in regim cvasistatic de semnal mic, este:

Maximizeaza

;

1Au ≅

3. Maximizeaza







nmlkj

4.

1Au −≅

nmlkj

Page 154 of 205


603.Pentru etajul colector comun prezentat in figura 18 rezistenta de iesire (cu intrare in scurtcircuit), in regim cvasistatic de semnal mic, este

Maximizeaza

+EC

Uin Uo

iIN

iO

RB1

RB2 RE

C1

C2 RL

Io

IinRG

+

-

Ein

1.

Rin≅ rπ

nmlkj

2.

Rin≅

rπβ

nmlkj

3.

EBin RRR β≅

nmlkj

4.

Rin≅ RE

nmlkj

Page 155 of 205


+EC

Uin Uo

iIN

iO

RB1

RB2 RE

C1

C2 RL

Io

IinRG

+

-

Ein

1.

Rr

o ≅π

β

nmlkj

2.

Ro≅RE

nmlkj

3.

β

≅ Eo

RR

nmlkj

4. Maximizeaza

nmlkj

Page 156 of 205


604.Pentru etajul baza comuna prezentat in figura19 amplificarea in tensiune U0/Uin, in regim cvasistatic de semnal mic (considerand RC< Maximizeaza













1.

Lmu RgA −≅

nmlkj

2.

;

Cmu RgA −≅

nmlkj

3. nmlkj

Page 157 of 205


605.Pentru etajul baza comuna prezentat in figura 19 rezistenta de intrare, in regim cvasistatic de semnal mic, este:

Maximizeaza

;

Lmu RgA ≅

4.

Cmu RgA ≅

nmlkj

Figura 19. Schema electricã a unui etaj bazã comunã încãrcat la intrare ºi

ieºire

RE

C1

Iin

Uin

RB1

RB2 RC

+EC

CB

C2

Io

UoIG RG RL

1.

Rin≅ rπ

nmlkj

2. Maximizeaza

nmlkj

Page 158 of 205


606.Pentru etajul baza comuna prezentat in figura 19 rezistenta de iesire (cu intrare in scurtcircuit), in regim cvasistatic de semnal mic, este:

Maximizeaza







3.

EBin RRR β≅

nmlkj

4.

Rin≅ RE

nmlkj







Page 159 of 205


607.Pentru etajul baza comuna prezentat in figura 19 frecventa superioara de lucru este:

Maximizeaza

1.

Rr

o ≅π

β

nmlkj

2.

Ro≅Rc

nmlkj

3.

β

≅ co

RR

nmlkj

4.

π≅ rRo

nmlkj

Figura 19. Schema electricã a unui etaj bazã comunã încãrcat la intrare ºi

ieºire

RE

C1

Iin

Uin

RB1

RB2 RC

+EC

CB

C2

Io

UoIG RG RL

1.

Page 160 of 205


608.Schema din figura 20 prezinta un amplificator inversor construit cu ajutorul unui amplificator operational. Amplificarea in tensiune este:

Maximizeaza

ωH≤ω

β

nmlkj

2.

ωH≤ω

T

nmlkj

3. Maximizeaza







nmlkj

4.

∞→ωH

nmlkj

Page 161 of 205


609.Schema din figura 21 prezinta un amplificator neinversor construit cu ajutorul unui amplificator operational. Amplificarea in tensiune este

Maximizeaza

Figura 20 Amplificator inversor

R2

R1

uIN +

-

uO

i1

i2

u+

u- (punct de masã vi

1.

1

2u R

RA −=

nmlkj

2.

1

2u R

R1A +=

nmlkj

3. Au=1 nmlkj4. Au este foarte mare nmlkj

Page 162 of 205


610.Figura24 prezinta un stabilizator cu dioda Zener. in functionare normala iZ indeplineste conditia

R2

R1

uIN

+

-

uO

i1

i2

1.

1

2u R

RA −=

nmlkj

2.

1

2u R

R1A +=

nmlkj

3. Au=1 nmlkj4. Au este foarte mare nmlkj

Page 163 of 205


611.Coeficientul de stabilizare al stabilizatorului din figura 24 este aproximativ

Figura 24 Stabilizator cu diodã Zener.

uRED uL

iRED

RLDz

RB iLiZ

1.

maxZZminZ iii ≥≤

nmlkj

2.

maxZZminZ iii ≤≤

nmlkj

3.

maxZZminZ iii ≤≥

nmlkj

4.

maxZZminZ iii ≥≥

nmlkj

Page 164 of 205



uRED uL

iRED

RLDz

RB iLiZ

1.

z

B

r

RS ≅

nmlkj

2. Maximizeaza







nmlkj

3.

L

B

RRS ≅

nmlkj

4.

1

≅S

nmlkj

Page 165 of 205


612.Rezistenta de iesire a stabilizatorului din figura 24 este aproximativ

613.Figura35 prezinta schema unui amplificator sumator. Tensiunea de iesire are expresia

Maximizeaza


uRED uL

iRED

RLDz

RB iLiZ

1.

Bo Rr ≅

nmlkj

2.

Lo Rr ≅

nmlkj

3.

Zo rr ≅

nmlkj

4.

BZo Rrr +≅

nmlkj

Page 166 of 205








1.

∑=

=

−=nk

1k k

kO

R

uRu

nmlkj

2. Maximizeaza







nmlkj

3. Maximizeaza

nmlkj

Page 167 of 205


614.Figura36 prezinta schema unui circuit de integrare. Tensiunea de iesire are expresia

Maximizeaza







4. Maximizeaza







nmlkj

Page 168 of 205








1. Maximizeaza







nmlkj

2.

( ) ( ) ξξ−= ∫ duRC

1tu

t

0

INO

nmlkj

3.

( ) ( ) ξξ−= ∫ duRCtut

0INO

nmlkj

4. nmlkj

Page 169 of 205


615.Figura37 prezinta schema unui circuit de derivare. Tensiunea de iesire are expresia

Maximizeaza

( ) ( ) ξξ= ∫ duRC1tu

t

0INO

Figura 37

+

-

uO

R

uIN

iR

C iC

1.

( )dt

tduRC)t(u INO −=

nmlkj

2.

( )dt

tduRC1)t(u IN

O =

nmlkj

3. Maximizeaza

nmlkj

Page 170 of 205


616.Figura38 prezinta schema unui circuit de logaritmare. Tensiunea de iesire are expresia

Maximizeaza







4.

( )dt

tduRC)t(u IN

O =

nmlkj

Figura 38 Circuit de logaritmare

D

+

-

uO

iD

R

uIN

iR

1. nmlkj

Page 171 of 205


617.Figura39 prezinta schema unui circuit de antilogaritmare. Tensiunea de iesire are expresia

Maximizeaza

( )

−

−=

≅ S

INT

S

INTO Iln

Rulne

IRulneu

2.

( )

−

−=

−≅ S

INT

S

INTO Iln

R

ulne

IR

ulneu

nmlkj

3. uO=1 nmlkj4. uO=uIN nmlkj

Figura 39 Circuit de antilogaritmare

+

-

uOuIN

RiR

DiD

1. uO=1 nmlkj2. uO=uIN nmlkj3.

T

INeU

SO eRIu −≅

nmlkj

4. nmlkj

Page 172 of 205


618.Impedanta de intrare in regim cvasistatic de semnal mic a unui amplificator de tensiune se determina

619.Impedanta de intrare in regim cvasistatic de semnal mic a unui amplificator de curent se determina

620.Impedanta de intrare in regim cvasistatic de semnal mic a unui amplificator transimpedanta se determina

621.Impedanta de intrare in regim cvasistatic de semnal mic a unui amplificator transadmitanta se determina

T

IN

e

U

SO eRIu ≅

1. introducand o sursa de test la intrare, iesirea fiind lasata in gol nmlkj2. introducand o sursa de test la intrare, la iesire introducandu-se o rezistenta sarcina de un 1 kW nmlkj3. introducand o sursa de test la intrare, iesirea fiind scurtcircuitata nmlkj4. introducand o sursa de test la intrare, la iesire introducandu-se o rezistenta sarcina a carei valoare se

determina din calcul nmlkj





1. introducand o sursa de test la intrare, iesirea fiind lasata in gol nmlkj

Page 173 of 205


622.Impedanta de iesire in regim cvasistatic de semnal mic a unui amplificator de tensiune se determina

623.Impedanta de iesire in regim cvasistatic de semnal mic a unui amplificator de curent se determina

624.Impedanta de iesire in regim cvasistatic de semnal mic a unui amplificator transimpedanta se determina

625.Impedanta de iesire in regim cvasistatic de semnal mic a unui amplificator transadmitanta se determina

2. introducand o sursa de test la intrare, la iesire introducandu-se o rezistenta sarcina de un 1 kW nmlkj3. introducand o sursa de test la intrare, iesirea fiind scurtcircuitata nmlkj4. introducand o sursa de test la intrare, la iesire introducandu-se o rezistenta sarcina a carei valoare se








1. introducand o sursa de test la intrare, iesirea fiind lasata in gol nmlkj2. introducand o sursa de test la intrare, la iesire introducandu-se o rezistenta sarcina de un 1 kW nmlkj

Page 174 of 205


626.Pentru un tranzistor bipolar in regim de blocare

627.Pentru un tranzistor bipolar in regim saturat

628.Pentru un tranzistor bipolar in regim activ normal inversat

629.In regim de blocare

630.In regim saturat

3. introducand o sursa de test la intrare, iesirea fiind scurtcircuitata nmlkj4. introducand o sursa de test la intrare, la iesire introducandu-se o rezistenta sarcina a carei valoare se


1. ambele jonctiuni sunt polarizate invers nmlkj2. ambele jonctiuni sunt polarizate direct nmlkj3. jonctiunea emitorului este polarizata direct, iar jonctiunea emitorului este polarizata invers nmlkj4. jonctiunea colectorului este polarizata direct, iar jonctiunea emitorului este polarizata invers nmlkj



1. tranzistorul bipolar se comporta ca un circuit intrerupt nmlkj2. tranzistorul bipolar se comporta ca un scurt circuit nmlkj3. apare efectul de transistor nmlkj4. tranzistorul nu se foloseste nmlkj

Page 175 of 205


631.In regim activ normal

632.In regim activ normal inversat

633.In conditii normale, o dioda stabilizatoare functioneaza

634.Tranzitia din starea de blocare in starea de conductie (amorsarea sau aprinderea) unui tiristor se face prin

635.Blocarea tiristorului se face




1. in regim de polarizare directa nmlkj2. in regim de polarizare inversa la tensiunea de strapungere V(BR) nmlkj3. in regim de polarizare inversa, la o tensiune mai mica decat V(BR); nmlkj4. in regim de polarizare inversa, la o tensiune mai mare decat V(BR); nmlkj

1. numai comanda de pe poarta nmlkj2. comanda de pe poarta si polarizarea directa a structurii (plus pe anod minus pe catod). nmlkj3. numai polarizarea directa a structurii (plus pe anod minus pe catod). nmlkj4. comanda de pe poarta si polarizarea inversa a structurii (minus pe anod pe plus catod) nmlkj

Page 176 of 205



637.Figura7 prezinta simbolul unui:

Maximizeaza

1. actionand in circuitul de forta prin reducerea curentului principal nmlkj2. polarizind invers jonctiunea poarta (grila) catod nmlkj3. polarizind invers jonctiunea poarta (grila) anod nmlkj4. prin efect duA/dt nmlkj

Figura 6

S

G

D

iD

iSuDS

uGS

uDG

iG

1. TECMOS cu canal initial p nmlkj2. TECMOS cu canal initial n nmlkj3. TECMOS cu canal indus p nmlkj4. TECMOS cu canal indus n nmlkj

Page 177 of 205



Maximizeaza

Figura 7

S

G

D

iD

iSuSD

uSG

uGD

iG


Figura 8

S

G

D

iD

iSuDS

uGS

uDG

iG


Page 178 of 205



Maximizeaza

640.Mecanismul strapungerii intr-o dioda de referinta (stabilizatoare) este:

1. 1. 2. 3. 4.

2. 1. 2. 3. 4.

3. 1. 2. 3. 4.

4. 1. 2. 3. 4.

5. 1. 2. 3. 4.

6. 1. 2. 3. 4.








1. totdeauna Zener nmlkj2. totdeauna strapungere prin avalansa nmlkj3. uneori strapungere Zener, alteori strapungere prin avalansa dar niciodata o combinatie a ambelor nmlkj4. uneori strapungere Zener, alteori strapungere prin avalansa si cateodata o combinatie a ambelor nmlkj

nmlkj nmlkji nmlkj nmlkj

nmlkji nmlkj nmlkj nmlkj





Page 179 of 205


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nmlkj nmlkj nmlkj nmlkji


nmlkj nmlkj nmlkji nmlkj























Page 180 of 205


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nmlkji nmlkj

nmlkji nmlkj

nmlkj nmlkji

nmlkji nmlkj

nmlkji nmlkj

nmlkj nmlkji

nmlkj nmlkji

nmlkji nmlkj

nmlkj nmlkji

nmlkji nmlkj

nmlkji nmlkj

nmlkj nmlkji

nmlkji nmlkj

nmlkji nmlkj

nmlkji nmlkj

nmlkji nmlkj

nmlkji nmlkj

nmlkji nmlkj

nmlkji nmlkj

nmlkj nmlkji



Page 181 of 205


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nmlkj nmlkji

nmlkj nmlkji

nmlkj nmlkji

nmlkji nmlkj

nmlkj nmlkji





nmlkj nmlkji

nmlkji nmlkj

nmlkji nmlkj

nmlkji nmlkj

nmlkji nmlkj

nmlkj nmlkji










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18-ELECTROTEHNICA