3 review ECT

[ELEX COACHING 3] September 15, 2012

1 | Southern Luzon State University

ELECTRICITY/MAGNETISM/SEMICONDUCTOR FUNDAMENTALS

Current is directly proportional to voltage and inversely proportional to resistance.

OHM’s LAW

A law that states that the algebraic sum of the current entering and leaving the node or junction is

equal to zero.

KIRCHOFF’S CURRENT LAW

One coulomb is how many electrons?

6.25x108

One coulomb is equivalent to ___ electrons.

6.25 X 10^18

Energy gap of semiconductor

1eV

Permeability of a material when its has a relative permeability of 10^-6

4π x 10^-1 H/m

Electrostatic charges can develop up to

35 000 VOLTS

Electron is pack in a given volume

ELECTRON DENSITY

What definition best describes an insulator?

A MATERIAL THAT HAS HIGH RESISTANCE

Which of the following is not a purpose of resistor?

Current limiting

Biasing

Voltage dividing

NONE OF THESE

If you are preparing to single lace conductors, what total length must the lacing be in relationship to

the longest conductor?

TWO AND ONEHALF OF THE LENGTH

A material which allows the lowest forward voltage drop for a diode

GERMANIUM

Resistance in a semiconductor is known as___________.

BULK RESISTANCE

Typical range of resistivity of semiconductor



10x104

In resistor, 4K7 has what value

4.7kohms

Resistor value: red, red, red, gold

2.2kΩ ±5%

Strain gauge resistance

200

In resistor circuit, a connection with greater power dissipation per resistor

BOTH PARALLEL AND SERIES

Carbon composition resistor

ESSENTIALLY HAS NO INDUCTANCE AND CAPACITANCE

An insulator is best described as

A MATERIAL THAT HAS A VERY HIGH RESISTANCE

A logical place for a wirewound resistor is in ____.

A HIGH-POWER DC CIRCUIT

A network of resistors, diodes and capacitors that shifts the DC voltage level without changing its

waveform. (parang ganun)

CLAMPER

Two conductors with insulator in between

CONDENSER (OLD NAME); CAPACITOR (NEW NAME)

Capacitor stores energy in

ELECTRIC FIELD

When a capacitor is connected to an AC source, the current ___ the voltage by 90 degrees

LEADS

Energy stored in an electrostatic or magnetic field

POTENTIAL

A ferromagnetic core placed in an inductor to __

INCREASE INDUCTANCE

The advantage of toroid core over solenoid core is it

CONCENTRATES MAGNETIC FLUX

An advantage of toroid core over a solenoid core is the fact that ___

THE TOROID CONFINES THE MAGNETIC FLUX



The unit for overall magnetic field quantity

MAXWELL

Another name for dielectric constant

RELATIVE PERMITTIVITY

The geomagnetic line of flux are

HORIZONTAL AT THE GEOMAGNETIC EQUATOR

Attractive forces exist when two parallel conductors have currents that are

OPPOSITE IN DIRECTION

When inductance is small,

ENERGY IS STORED AND RELEASED QUICKLY

A good form of inductor at FM

AIR CORE

Ferromagnetic coils are not used in RF because air core is ____

A BETTER INDUCTOR AT FM

Paper capacitor has less service life than other capacitor. This is a _____ statement.

FALSE

A paper capacitor is generally has shorter life compared to other type of capacitor

FALSE

Typical value of paper capacitor

.01 pF

In a Variable air type capacitor, capacitance is maximum when ______

MOVABLE PLATES ARE CLOSE

The SI unit for exposure in x-ray, gamma, and in air.

COULOMB PER KILOGRAM ( C/KG )

The unit of a current.

AMPERE

When a charge of one Coulomb passes at one point in one second, the electrical charge is ___

1 AMP

Voltage drop is____

DIFFERENCE IN POTENTIAL BETWEEN TWO POINTS

Examples of trivalent impurities

BORON, GALLIUM, INDIUM



Acceptor impurities

TRIVALENT IMPURITIES

Energy gap of a semiconductor

1eV

Pure silicon

ELECTRON AND PROTON ARE EQUAL IN NUMBERS

The mostly used semiconductor material in manufacturing electronic devices

GE, SI AND GAAS

The most extensibly use semiconductor

SILICON

An intrinsic semiconductor has ___ bond that forms … tetra???

COVALENT

PN junctions are protected from contamination during the fabrication process by which materials?

OXIDE

Advantage of GaAs to Ge and Si.

FASTER

Of the following tests, which is the most valid for checking a diode

DYNAMIC ELECTRIC CHECK WITH DIODE TEST SET

What current flow in a semiconductor is due to the applied electric field?

Drift Current

A semiconductor equivalent to two diode in series with reversed polarity

THYRECTOR

Intrinsic semiconductors (or impurities?) have

COVALENT BOND FORMING TETRAHEDRAL STRUCTURE

A compound of the elements gallium and arsenic used in the manufacture of devices such as

microwave frequency integrated circuits, monolithic microwave integrated circuits, infrared LED,

laser diode, solar cells and optical window.

GALLIUM ARSENIDE (GaAs)

A solid form in which atoms, ion, and molecules are ordered in well arrangement

CRYSTALLINE

A structure of solid in which the position of atoms are predetermined

CRYSTALLINE

A liquid crystal that is least ordered and more liquid-like



NEMATIC

An ac electromagnet ___

ATTRACTS PURE, UNMAGNETIZED IRON

The force between a permanent magnet and a ferromagnetic material that is not yet magnetized is

NEVER REPULSIVE

Increase in space in electromagnetic circuit …

INCREASE RELUCTANCE

Advantage of electromagnet over permanent magnet

ELECTROMAGNET CAN BE SWITCHED ON AND OFF

When an ion …… on ground state…

IONIZATION ENERGY

…… expand the surface area….

SURFACE TENSION

Describes the color of radiation emitted by a blackbody at a given temperature.

WIEN’S LAW

Nonmetallic protection for wires and cables

FIBROUS BRAID

A button-shaped carbon composition resistor microphone.

BUTTON MICROPHONE

AC/DC CIRCUITS

A complex circuit simplified to an open circuit voltage and open circuit resistor

THEVENIN'S THEOREM

What theorem is used in solving electrical circuits with several voltage sources?

SUPERPOSITION

Refer to current pulses that flow in the same direction

PULSATING DIRECT CURRENT

Relays are used to.

DECREASE THE CURRENT IN THE CIRCUIT



Damage to the electric component occurs at what minimum electrostatic potential.

35 VOLTS

Type of converter used to convert DC voltage to AC voltage

INVERTER

A process of converting an alternating current to a pulsating dc.

RECTIFICATION

In circuit, it is use to convert AC voltage to DC voltage

RECTIFIER

Vrms in an ac…

HOLDING VOLTAGE

A value at any instant time

INSTANTANEOUS VALUE

Voltage/current along at any instant of time

INSTANTANEOUS

Frequency is inversely proportional to . . . slope

SINE WAVE

What is the amplitude of two waves with equal amplitude and frequency but opposite in phase

ZERO ( THE SIGNAL WILL CANCEL EACH OTHER)

Represents a cycle of degree of phase

1/360

The angular frequency of a 60-Hz AC source

377 RAD/SEC

Two same frequencies 1/10 cycle apart has a phase difference of

36 DEGREES

Two AC signals with the same frequency but differs in phase by 1/10 of a cycle. What is the

difference of two signals?

36 degrees

The length of time between a point in one cycle and the same point in the next cycle of an AC wave

is the ___

PERIOD

When a capacitor is placed in an AC supply, the current ____ voltage by 90 deg

LEADS

The absolute value of the impedance in a circuit increases ___



THE FLOW OF AC DECREASES

Relay that conducts only when current is supplied.

NORMALLY OPEN

When there is a reactance in the load where the transformer is connected

PERFECT IMPEDANCE MATCH CANNOT BE OBTAINED

POWER SUPPLY/GENERATORS and MOTORS

Efficiency of silicon solar cells __

22%

Efficiency of a full wave rectifier

81.2%

Efficiency of a half wave rectifier

40.6%

In full-wave rectifier, the ripple is ________ than that of a half-wave rectifier.

TWICE

Combination of cells connected in series

BATTERY

A battery consists of_____________.

NUMBER OF CELLS

A latern battery is most like to be found in __

A TWO WAY RADIO

A nickel-iron cell has a nominal voltage of 1.2V. It is also known as ___ cell.

EDISON

A modified version of the UPS which is used as back-up power supply

STAND-BY POWER SUPPLY

Where would you most likely find a lead-acid battery?

IN AN UNINTERRUPTABLE POWER SUPPLY

As a rule of thumb, Power rectifier ... back-to-front or front-to-back ratio is __

10-to-1

As a rule of thumb, Signal diode ... back-to-front or front-to-back ratio is __

300-to-1



A modified UPS wherein the power line itself serves as a back-up for the system

STANDBY POWER SUPPLY

In a Carbon zinc battery, zinc serves as

NEGATIVE CATHODE

What is the advantage of Alkaline cell over zinc-carbon cell

ALKALINE CELL WORKS WITH LOW TEMPERATURE

An advantage of alkaline cell over zinc-carbon cells

THE ALKALINE CELL CAN DELIVER USEFUL CURRENT AT LOWER TEMPERATURES

(mahabang intro…..tapos,)If you need low volume, low mass, and do not need regular maintenance,

what type of battery should you use?

LITHIUM BATTERY

Typical output of silicon photovoltaic cell

0.6 VOLTS

Maximum theoretical efficiency of solar cell

22%

The electrical power that a solar panel can provide either in direct sunlight depends on all of the

following factors except

AC VOLTAGE APPLIED DIRECT TO PANEL

A variable positive regulator.

317

A fixed positive regulator

74XX

The most efficient regulator, used for high voltage and high current application

SWITCHING REGULATOR

Regulator that dissipates less power and less heat

SWITCHING REGULATOR

Linear regulator in which the load connected to the unregulated source must be kept constant

SHUNT REGULATOR

A regulator that dissipates less heat and less power

SWITCHING REGULATOR

…frequency varies…

VOLTAGE CONTROLLED RECTIFIER



In a rectifier, to have a desired dc voltage output, ________ should be installed.

FILTER CAPACITOR

A current surge takes place when a power supply is first turned on because, ___

FILTER CAPACITOR MUST BE INITIALLY CHARGED

The part of a power supply immediately preceeding the regulator is

FILTER

It is not a main component of an AC power supply.

RECTIFIER

A plate-type capacitor with two stator sections and a single rotor section common on both stators

BUTTERFLY CAPACITOR

If there is reactance in the load to which a transformer is connected, then ___

A PERFECT IMPEDANCE MATCH CANNOT BE OBTAINED

When reactance exists in the output of a ??? transformer,

THERE WILL ALWAYS BE AN IMPEDANCE MISMATCH

Maximum efficiency of half-wave rectifier

40.6 %

One revolution is equal to 200 steps. What is the angle movement?

1.8

Which is easily filtered by a power supply?

HIGH FREQUENCY PULSATING DC

Which motor is the best choice for handling heavy loads at short duration

COMMULATIVELY COMPOUNDED

In shunt wound with constant speed, as the current increases the _____

TERMINAL VOLTAGE INCREASES

The spin of a motor is 100% until the motor reach

LOW VALUE

Maintains the current in varying load better than series

SHUNT

Two primary parts of a rotating generator

PERMANENT OR TEMPORARY MAGNETS AND ARMATURE WINDINGS

Alternative to DC Motor as actuator.

PIEZO MOTOR OR ULTRASONIC MOTOR



Compared to straight cut spur gear, helical gear has_____________.

LESS BACKLASH

The current in secondary winding is greater than primary winding in step-up transformer.

This statement is _______.

FALSE

A transducer which converts linear motion of the object mechanically connected to it to electrical

signal

LINEAR VARIABLE DIFFERENTIAL TRANSFORMER (LVDT)

A shell method in transformer winding

PULSE MAXIMUM COUPLING

The electronic transfer of energy from one stage to another is called_____.

COUPLING

SOLID STATE DEVICES and CIRCUITS

(BJT/FET/MOSFET)

In JFET, the transconductance is the ratio of ______

CHANGE IN DRAIN CURRENT OVER THE CHANGE IN THE GATE VOLTAGE

MOSFET vs JFET

MOSFETS CAN HANDLE A WIDE RANGE OF BIAS VOLTAGE

Field-effect transistor combining the depletion mode properties and enhancement mode properties

MESFET

Signal diode can operate satisfactorily from front-to-back ratio or back-to-front ratio.

300 to 1

Ratio of small change of zener voltage with the small change of zener current

ZENER DYNAMIC IMPEDANCE

Cutting and peeling is an easy way to remove what kind of coating?

SILICONE

In n-channel JFET, pinch-off occurs when the gate bias is

VERY NEGATIVE

If gate source voltage is zero, the current that flows in the JFET is

DRAIN SOURCE SATURATION CURRENT

Bipolar transistor and JFET in multivibrator are in

COMMON-EMITTER AND COMMON-SOURCE CONNECTION



Used in most voltage regulators as their control element

BJT

The input saturates the transistor. This will __

REDUCE EFFICIENCY

The hfe of a bipolar transistor corresponds to

BETA

Current gain in common collector is called______.

GAMMA

_____ configuration is used as a stable RF power amplifier

COMMON BASE

To obtain a high input impedance, __ configuration is used

COMMON COLLECTOR

When looking for good voltage gain and high input resistance ___ must be used

COMMON-SOURCE AMPLIFIER

Transient supression avoid the risk of _____

DIODE FAILURE

Checking of transistor become cumbersome when more than one is defective

SUBSTITUTION METHOD

Emitter junction produced on the base layer of the mesa transistor

VACUUM EVAPORATION OR DIFFUSION

Solid without crystalline formation

AMORPHOUS

ELECTRONIC (AUDIO/RF) CIRCUIT/ANALYSIS/DESIGN

(Oscillators &Multivibrators, Feedbacks, Amplifiers, Attenuators, Filters)

Two split capacitance parallel with an inductance

COLPITTS

Used in Op amp differential amplifier.

RESISTOR

Purpose of a varactor

TUNING A GUNN-DIODE OSCILLATOR

In an op amplifier, the peak value decreases when _____



POWER BANDWIDTH INCREASES

A voltage follower amplifier has a voltage gain of_____.

UNITY

Voltage amplifier is also called as

PRE-AMPLIFIER

Voltage gain is practically expressed in

dB UNITS

The voltage gain of an amplifier is expressed in

dB units

Current supplied in the input of an amplifier

INPUT BIAS CURRENT

What is the closest value of MPP of an op-amp if its two supply voltages are ± 18V?

36V

Typical external frequency-compensating capacitance on op-amps

3-30PF

Rate of output voltage of op-amp with respect to input signal

SLEW RATE

In amplifiers, it is made with compensating circuit,… the reason for high open loop gain….

(mahabayungtanong)

ROLL OFF

A 74IC op-amp unity loop gain frequency is

1 MHZ

An LF 157A is a/an _____ op amp

BIFET

In inverter amplifier, the closed loop voltage is equal to

FEEDBACK RESISTANCE DIVIDED BY INPUT RESISTANCE

Preventing the compensating capacitor in OP AMP

OSCILLATION

Bandpass, bandstop, high pass or low pass filter characterized by flat pass and high attenuation..

BUTTERWORTH FILTER

Frequency of the crystal depends on the _____

THICKNESS OF THE CRYSTAL



Rejects the band and allows the upper and lower frequency to pass. Also known as band

suppression and band rejection filter.

BANDSTOP FILTER

A filter that allows a narrow band of frequency to pass through the circuit and rejects or attenuates

the frequencies that is below or above the frequency range.

BANDPASS FILTER

The main disadvantage of single balance mixer is that ____________.

INPUT IS NOT COMPLETELY ISOLATED

MICROELECTRONICS

A technology that uses an extremely small elements…

MICROELECTRONICS

Electronic system which consists extremely small elements

MICROELECTRONICS

An assembly of microcircuit or combination of microcircuit and discrete components

MICROCIRCUIT MODULE

Name and letter fabricated in the body of the IC provide what information.

USE

Letters and number stamped on body of an IC serve to provide which of the following types of

information?

USE

A compound of Gallium and Arsenide that is used in manufacturing microwave frequency integrated

circuit, monolithic microwave frequency integrated circuit, at marami pang iba…. :]

GALLIUM ARSENIDE

Conformal coating is said to be thin if it is less than what thickness?

0.025 inch

The most popular op-amp packages are the metal can, 8-pin DIP and the SMT. Which of these

corresponds to TO-99?

METAL CAN

Plug-in DIPs are susceptible to loosening because of which of the following causes?

VIBRATION

Layer of aligned atoms used as coating in IC production.

EPITAXIAL LAYER

When there is no input signal, Ic is minimum



WHEN E-B IS REVERSE BIASED

Maximum number of IC in large scale integration

2000

In IC fabrication, gold and aluminum are used to

TO CONNECT PACKET LEADS

In IC, lead is protected from contamination during fabrication process by which of the following

material

OXIDE

Approximate typical diameter and thickness of silicon wafer

2” ; 0.01”-0.02”

A device that allows the depositing of material in selected areas of a semiconductor substrate, but

not in others is known as a

WAFER MASK

The most complex to produce and difficult to repair printed circuit boards are those made using

which of the following methods

LAYER BUILD UP METHOD

Advantage of IC over discrete components

HIGHER ATTAINABLE SWITCHING SPEED

Assembly of microelectronics or combination of microelectronics and discrete component is

referred as ____

MICROCIRCUIT MODULE

Recommended way of removing imbedded TOs

PULL OUT GENTLY

Deposition of a highly radiated material in wafer

VACUUM EVAPORATION

A single chip with dual 555 timer built in.

556

Plastic insulation is commonly used in what voltage level?

MEDIUM TO LOW

. . . ___ Total heat if electrodes.

TWO THIRDS

LOGIC/COMPUTER The size of an empty folder is approximately ____________.



1KB

8086 is a ___ bit microprocessor.

16

The average latency of magnetic tape memory is __ seconds

60

A program that lies in between the application software and computer hardware.

OPERATING PROGRAM

(Some computer descriptions..) Computer handles: I-Input devices, II-Processor, III-Output devices,

IV-Storage

I, II, III AND IV

Which of the the ff. is not a fundamental features of computer

SPEED, HIGH COST, RELIABILITY, STORAGE CAPACITY

Signal that the computer is awaiting a command from the user

PROMPT

Pulse counter accelerometer is only used at what kind of computers?

DIGITAL COMPUTERS

Supercomputers are measured in terms of ____

FLOPS (FLOATING POINT OPERATIONS PER SECOND)

Main program of operating system

KERNEL

In computer, file size is measured in _

BYTES

Time between the user’s request and the computer’s reply

RESPONSE TIME

Most common application for accessing the internet

BROWSER

Desktop and personal computers are also known as

MICROCOMPUTERS

Computer user which is not a personal user is also called

END USER

In computer system, central processing unit is part of the?

HARDWARE



Which is not a local storage device?

PCI STATUS REGISTER

Confining each program at certain defined limits in memory is called _____________.

MEMORY PROTECTION

Fundamental characteristics of computer

I. SPEED

II. RELIABILITY

III. STORAGE CAPABILITY

I, II, III

The use of byte to store two numerals

PACKED BCD

Term used to describe the first remainder when converting decimal numbers to other bases

LSD

Type of IC that is needed to be physically removed to change the data…

EPROM

What is the output if the input of a RS flipflop is R=low, S=high?

LOW

In positive edge triggering, the change of state occurs when

THE PULSE LEVEL IS GOING FROM LOW TO HIGH

Major cause of frequency error in counters

COUNT-HOLD CIRCUIT

PDA means

PERSONAL DIGITAL ASSISTANT

Free cable technology…that people can surf… e-mail..

WI-FI

An ultraspeed and long range connection intended for houses and businesses that are not reachable

by cables.

WiMax

??????

MAGNETIC BUBBLE DISK, RAM, MAGNETIC DISK, FLOPPY DISK

The input of an OR gate is inverted by a not gate the resulting gate is a

NAND

If the input of OR gates are connected with NOT gates, the output will be the same as __

NAND GATE



In 74LSXX, LS means __

LOW POWER SCHOTTKY

All logic gates is made of ____

TRANSISTOR

Advantage of JK to RS FlipFlop.

PREDICTABLE OUTPUT

INSTRUMENTATION

(Test/Measurements, AC/DC Bridges) Process of determining the magnitude of a .… standards

MEASUREMENT

A technique that detects the presence or absence of a feature. It has also simple mechanical probe

and vision system.

AUTOMATED INSPECTION

Equilibria which is present between two different states of matter can be represented by what

graphical diagram?

PHASE DIAGRAM

In damage electronic components, what is the minimum electrostatic?

37

Common type of meter movement.

D’ ARSONOVAL MOVEMENT

Combination of Voltmeter, Milliameter, and Ohmeter

VOM

Instrumentation amplifiers are used in

HIGH-NOISE ENVIRONMENT

Most accurate device for measuring dc voltages

DIFFERENTIAL VOLTMETER

How do you increase the range of voltmeter?

INSERT HIGH RESISTANCE IN SERIES

Device used to measure power

WATTMETER

A special type of magnetomotive use to measure the earth’s ……..

KEW MAGNETOMOTIVE

To remove the insulation in a wire, what tool is use?



WIRE STRIPPER

It is sometimes called as Maxwell-Wien bridge used to measure inductance using known capacitance

MAXWELL BRIDGE

Sometimes called as Maxwell-Wien bridge that is used to measure unknown inductance with

capacitance standard

MAXWELL BRIDGE

A contact used to remove lead resistance on the accuracy of measurement

KELVIN CONTACT

Test to locate the ground fault in a single cable

BLAVIER’S TEST

Horizontal displacement in oscilloscope CRT is measured in___________.

TIME PER VOLT DIVISION

In time-domain oscilloscope, the wave to be analyzed is applied to _______.

VERTICAL DEFLECTION PLATES OR COILS

What does OMR stands for?

OPTICAL MARK RECOGNITION

To increase the range of a voltmeter one must insert a high resistance in ______

SERIES

Torque produced with the effects of voltage or current in an instrument

DEFLECTING TORQUE

Test equipment that continuously monitors performance and automatically isolates faults to

removable assemblies is what category equipment?

ON-LINE

When a wire is insulated with glass braid or asbestos and requires stripping, which of the following

tools should not be used?

HOT-BLADE STRIPPER

Because its resistance changes very little temperature changes, what conductor is best suited for

use in measuring instruments?

MANGANIN

Instrument used to monitor/measure animals’ activities (i.e., PH…)

RADIO PILL

INDUSTRIAL ELECTRONICS

(Thyristors, SCR, opto…)



Outermost spectrum of the broadest LED

100nm

A unit that is used to derive the quantity called absorbed dose.

RAD

Application of biometry are the following except

a. INVESTIGATION

b. authentication

c. identification

d. verification

Biometry is used in:

AUTHENTICATION; IDENTIFICATION; VERIFICATION

A PN junction of a point (a) to ……. Point (b).. of an SCR.

EMITTER, EMITTER

The minimum current needed by SCR to maintain its conducting state

HOLDING CURRENT

TRIAC voltage capacity in volts?

1000V

The typical turn-off voltage of a MOS controlled thyristor or MCT

15V

In motor action, the firing angle of an SCR is used. What % of the power is transferred?

95

Source of energy of IRED

ELECTRON CHANGE OF POTENTIAL

Intermediate junction of the wires in thermocouples.

COLD-JUNCTION EFFFECT

Most commonly used metal in metallization process

ALUMINUM

The process of making a material “passive” in relation to another material and use the material

together

PASSIVATION

RUBBER TAPE AND SHRINKABLE TUBE

MASNY CIRCUIT



Printed circuit board is mainly damaged by______________.

REMOVAL OF THE COMPONENTS

SYNCHROS, SERVOS, GYROS

If the synchro has loose bearing_____________.

REPLACE THE SYNCHRO

Advantage of multispeed synchro over single speed synchro.

GREATER ACCURACY

The arrow on the synchro schematic symbol indicates the

ANGULAR POSITION OF THE ROTOR

Minimum number of synchros required to make a simple synchro system

2

Minimum number of syncro for a syncro system

2

Indicating device installed in the stator circuit of the torque in synchro . . .

OVERLOAD INDICATOR

In synchro allignment the purpose of coarse setting

TO MAINTAIN 0 DEGREES RATHER THAN 180 DEGREES

Number of direction a rate gyro is free to precess

TWO

For a gyro to be universally mounted, it must have ___ gimbals.

TWO (2)

In gyro to be universally mounted, must have _____ gimbals.

2

What gyro characteristic provides the bases of the operation at a rate gyro?

PRECESSION

In order to have a smooth and efficient servo system, the two factors need to be balance

AMPLIFICATION AND DAMPING

Synchro capacitance is use to __ in synchro system

IMPROVE ACCURACY

A device that can be used as a position sensor in a servo system

POTENTIOMETER



Used as position sensor of servo system

POTENTIOMETER

WELDING

Most efficient soldering temperature.

500˚F

What should be done to the removable tip of a solder gun when it is pitted

FILE THE TIP TO SMOOTH AND RETIN

Solder fracture occurs when the

SOLDER IS MOVED WHILE BEING COOLED

In removing solder using solder wick, wick is placed where?

BETWEEN THE JOINTS AND IRON

An electric arc welding that uses arc between the..

FCAW

High frequency resistance welding (HFRW) uses high frequency up to ___.

450 kHz

In SMAW, the use of less spatter but medium penetration

DC STRAIGHT OR DCSP

….1/32 inch long….. to

TO PREVENT BURNING OF INSULATION

The bend of fullclinched iron and halfclinched iron

90 AND 45 DEGREES

To remove a solder with a twick where should the twick be in relation to the joint and iron

BETWEEN JOINT AND IRON

One of the most commonly used type of welding is manual metal arc welding (MMA) or ???. It is

also known as

SHIELDED METAL ARC WELDING (SMAW)

In welding, . . . to protect the weld from contamination

MIG/GMAW

In automatic welding, release is followed by ___ interval.

STANDBY

Supply in SMAW deep weld penetration?

DC REVERCED (DC+ OR DCRP)



During arc welding process, current is in the range of

50A-450A

In AWS (american welding S******), for ES60xx, 60 means a tensile strength of _______

60 000 psi

A part of the welding process interval when there is a flow f current

HEAT SUB-INTERVAL

In Ultrasonic welding, frequency is in the range of _______

10 KHZ-75KHZ

High Frequency Resistance Welding (HFRW), uses high frequency current up to

450Khz

After weld interval, ____ interval in which electrodes are placed in metal surface

HOLD

Steering the leads during desoldering prevents __

SWEAT JOINT

When a TO or DIP is to be replaced, the termination applied is

THROUGH-THE BOARD

Type of PCB that is most complex to build and most difficult to repair.

LAYER BUILD-UP

ROBOTICS

What is a robot?

It is a piece of machine……(mahabaito)… useful tool for manufacturing

The science and technology concerning robots, its design, . . . and applications.

ROBOTICS

Introduction to robotics, industry

LABOR SAVINGS, IMPROVED QUALITY PRODUCTS, REDUCE MATERIAL COSTS

Large size man ..aphend robot

SCARA… IN Z AXIS..

Moving in one direction rate motor has how many precession

2

A solid mass has how many degrees of freedom

6



DEA pragma robots

3P, 2R, 3P2R

Low technology robots have

2 TO 4 AXES

The ability of a robot to position its end effectors at programmed location in space

ACCURACY

In robotics, __ has a limit but no trajectory

FIXEDSTOP ALSO KNOWN AS NONSERVO ROBOT, OR OPEN ROBOT

Keyword: “two fingers” . . . The grasping hand of a robot, which manipulates objects and tools to

fulfill a given task

GRIPPER

Robot hand; robot arm

END EFFECTOR; MANIPULATOR

Muscle of robot

ACTUATOR

An actuator which resembles a biological muscle.

AIR MUSCLE

A robot with rotary joint just like a human arm

ANTHROPOMORPHIC ROBOT

A robot used to assist doctor/nurses

MEDICAL ROBOT

Total environment of robot, a robot must performs its task

WORK CELL

In, robotics measuring quantities(resistance, voltage, rotation) also use in pneumatic, hydraulic and

electric actuator

ANALOG SYSTEM

Harmonic drive in robot transmission system has _____

HIGH RELIABILITY

In robot, a program that uses numeric symbol

NUMERICAL METHOD

In robot, an actuator that rotates few degrees when a signal is send by the controller

STEPPER MOTOR

In robotics, opposition … electro values, as done in path planning



INVERSE KINEMATICS

Calculation of the forces applied by the actuator to know the proper end-effector acceleration

INVERSE DYNAMICS

Used to calculate the end effectors……

DIRECT KINEMATICS

Developing robot programs partially or completely without requiring the use of the robot itself.

OFF-LINE PROGRAMMING

Harmonic drive in robot.

WAVE GENERATOR, FLEXSPLINE, CIRCULAR SPLINE

What is the most popular output type of driver used in robot transmission system?

TOTEM POLE DRIVER

Area where human is trapped in the work envelope without having an avenue of escape on it

PINCHPOINT

Desire characteristic of a robot

GOOD LOAD CAPACITY, . . . . . .

Use to be able to walk the robot . . . .

DYNAMIC BALANCE

In low technology robot; which drive is easiest to control?

hydraulic

pneumatic

ELECTRIC

Process of transferring mechanical.. from one place to another. Has a nominal constant gear ratio.

CHAIN DRIVE

In robotics, it refers to the promising and experimental form of actuator.

ELECTRIC NANOTUBE

What is/are the basic parts of a robot?

i. Commulator

ii. End Effector

iii. Manipulator

iv. Power Source

i-iv

In robot it is use to grasp, hold, and transport also called robot “hand”.

GRIPPER



In robot, part of joint-arm connected to the shoulder

UPPER ARM

Chain is composed of, _____ (its bone), _____ (its muscle) and ____ for more degrees of freedom

LINKS, ACTUATOR, JOINTS

Used as gripper to grasp and handle tools

END-EFFECTOR

Robot which motions are controlled by driving the axis or degree of freedom against mechanical

limit stop.

BANG BANG ROBOT

Type of robot with two moves or three degrees of freedom to transfer item from source to

destination by point-to-point contact

BANG-BANG ROBOT

A robot that has only two moves or three degrees of freedom that picks a material from source to

destination or from point-to-point.

PICK AND PLACE ROBOT OR BANGBANG ROBOT

Robot that is capable to stop at or move in unlimited number of points in executing a programmed

trajectory.

SERVOCONTROLLED ROBOT

What do call a robot where its base is permanently or semi-permanently attached to the floor?

FLOOR MOUNTED ROBOT or PEDESTRAL ROBOT

In robotics, the loading/ unloading of cartoons, container, or pallet

PALLETING/DEPALLETING

In robot, the rotational and translational axes which measures robot motion.

DEGREE OF FREEDOM

It is a sensor used in magnetoencephalography.

SUPERCONDUCTING QUANTUM INTERFERENCE

In robotics, DC motors and stepper motors are preferred over AC motors because ____

THEY CAN WITHSTAND LARGE OVERLOADS

The detection by a robot though contact of touch, force, pattern slip and movement. It allows for

the determination of local shape, orientation and feedback forces of a grasped workspace.-

TACTILE SENSING

Desired output parameter by a sensor

SET POINT

Will be turned on when motion limit occurs



LIMIT SWITCH

Mechatronics is the combination of mechanics and electronics. Mechatronics is coined in what

country?

JAPAN

Robots with little if any computer power. Their only intelligent functions consist of learning a

sequence of manipulative actions, choreographed by a human operator using a teach box

FIRST GENERATION OF ROBOT SYSTEM

A robot with a computer processes added to the robotic controller. This addition makes it possible

to perform, in real time, the calculations required to control the motions of each degree of freedom

in a cooperative manner to effect smooth motions of the

SECOND GENERATION ROBOT

Consists of multiple microprocessors

3RD GENERATION ROBOT SYSTEM

EXPERT SYSTEM

BIOMEDICAL ELECTRONICS

Imaging technique used to measure the magnetic field produced by the electrical activity of the

brain

MAGNETOENCEPHALOGRAPH

Curie has how many transformations (decay) or disintegrations per second

37, 000,000,000

Dose of radiation that can cause symptoms of radiation (e.g. tiredness and nausea) if takes within 24

hours has what value?

1000mSv

One becquerel =_____dps

ONE

Radiation dose of a person when he/she is X-rayed

0.1 MSv

One curie is equal to ____ Bq

3.77x1010

Biological dose of radiation in a HUMAN tissue that had been absorbed.

ROENTGEN EQUIVALENT MAN (REM)

A unit used to measure a quantity called absorbed dose that relates to the amount of energy

actually absorbed in some material and is used for any type of radiation and any material.



RAD (RADIATION ABSORBED DOSE)

SI unit used of the absorbed dose in HUMAN tissue to the effective biological damage of the

radiation.

SIEVERT

SI unit of absorbed dose (absorbed in some MATERIAL)

GRAY

A person can die recieving this amount of mSV dose at the same time

6000 mSv

Maximum allowable dose for a radiation worker in 5 years

100mSv

It is a measure of the ionizations of the molecules in a mass of air. The main advantage of this unit is

that it is easy to measure directly, but it is limited because it is only for deposition in air, and only for

gamma and x rays.

ROENTGEN

The dose of radiation a patient is exposed when having a teeth/tooth check up

0.01 mSv

1 roentgen = Coulumb/kg

0.000258

Physiological biometry uses

IRIS AND RETINA

FACIAL RECOGNITION

FINGER AND HAND PRINTS

HALL OF FAME

Discovered the magnetic effect

HANS CHRISTIAN OERSTED

Invented IC

JACK KILBY

TELL ME WHEN

The first systematic work in liquid crystals was first reported on

1888



ELECTRONIC EFFECTS

The voltage produced in the thermocouple is directly proportional to the temperature in the

junction. This is also known as

SEEBECK EFFECT

In thermocouple, when one junction is heated (absorbs energy) and the other junction is cooled

(releases energy)..

PELTIER EFFECT

The liberation or absorption of heat when an electronic current flows from a warmer to a cooler

part of conductor.

THOMSON EFFECT

Nucleus are stimulated to emit a defined beam of gamma ray

MOSSBAUER EFFECT

Condition where in a nucleus can be stimulated to emit upon sharply defined beams of gamma rays.

MOSSBAUER EFFECT

The sudden, large increase in current that occurs when the particular value of the reverse voltage is

reached, and in which is due to ionization by the high intensity electric field in the depletion region

in reversed biased pn junction.

ZENER EFFECT

Magnetization of a helically wound, ferromagnetic wire fluctuates, the tendency for a potential

difference to occur

MATEUCCI EFFECT

LAWS AND THEORIES

Law which states that the force of repulsion or attraction between charges is directly proportional to

their strength

COULOMB’S FIRST LAW

MAXWELL’s LAW

UNCLASSIFIED

Each satellite in the Iridium Satellite system has how many spot beams

48

Change of state from solid to gas

SUBLIMATION



Visual inspection of a completed repair is conducted to evaluate which of the following aspects of

the repair?

WORKMANSHIP QUALITY

Which of the following splices is NOT butted?

KNOTTED TAP JOINT

Orbital that has one electron that is outside the orbital that is closest to and nearer to L orbital.

M ORBITAL

Inclusion of loop/subroute to larger loop/subroute

NESTING

The approved way of removing xxx coating xxx?

MECHANICAL, THERMAL AND CHEMICAL

Which is NOT a solid?

SUPERCRITICAL

Changes color in different temperature

CHOLESTERIC

A flow of current through an ionized path by electrical arc

HOLDOVER

The manufacture of parts in discrete runs or lots, generally interspersed with other production procedures. BATCH MANUFACTURING

?????

IN PHASE ONLY

??????

DISCHARGE CURRENT

??????

INVERSE SQUARE LAW

??????

85-90%

Documents

3 review ECT