Review Questions in Electronics.ppt

7/27/2019 Review Questions in Electronics.ppt

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REVIEWQUESTIONS

Engr. Jaime P. Licuanan, CCNP, CWSP


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1. Which diode has negative resistance characteristics?

a. Tunnel diode

b. varactor

c. LED

d. Schottky diode

2. What is the reduction in the power rating of a device because of an increase intemperature?

a. Power derating

b. Power dissipation

c. Power loss

d. Power evaporation

3. It is the process of liberating electrons from surfaces of materials

a. fission

b. fusion

c. possession

d. emission


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4. The term used to describe sudden reverse conduction of an electronic componentcaused by excess reverse voltage across the device?

a. avalanche

b. tsunami

c. saturationd. Reverberation

5. What type of diode is made of metal whisker touching a very small semiconductordie?

a. Zener diode

b. PIN diode

c Point contact diode.d. TRAPATT

6. Amount of energy needed to liberate electrons from the surface of metals.

a. Ionic discharge

b. corona

c. workfunctiond. potential


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7. Most screen nowadays are LCD, what do you call the liquid crystal in the LCD?

a. pneumatic fluid

b. nematic fluid

c. clean and refreshing mineral water

d. plasma

8. Negative feedback was developed by Harold Black and typically employed in amplifiersto reduce what?

a. feedback fraction

b. error voltage

c. distortiond. gains full control

9. Zener diodes are used in voltage regulation, as an engineer how are you going todescribe the breakdown voltage of a zener diode?

a. its increasing exponentially

b. its almost constant

c. it destroy the zener dioded. well measured and apply to forward biased the zener diode


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10. Which of the following is not a pentavalent impurity?

a. Arsenic

b. Phosphorus

c. Antimony

d. Indium

11. Minority carriers are due to ___________.

a. doping

b. ionization

c. Thermal increase

d. Minority block

12. It is a transistor application used as an interface between a circuit with a highoutput resistance and a low-resistance load.

a. isolator

c. buffer

b. circulator

d. amplifier

13. Which amplifier configuration has the lowest current gain?

a. common collector

c. common emitter

b. emitter-follower

d. common base


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14. what is the main feature of crystal oscillator?

a. economy

b. reliability

c. durability

d. beauty

15. Combination of two class B amplifiers working together is known as

a. pull-pull amplifier

b. push-push amplifier

c. push-pull amplifier

d. power amplifier

16. What is the most efficient type of amplifiers?

a. Class A

c. Class C

b. Class Bd. Class AB


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17. With the rise in temperature of a PN junction, which of the following will increase?

a. Width of the depletion layer

b. Junction barrier voltage

c. Reverse leakage current

d. All of the above

18. A circuit has a supply voltage of 0.65Volts forward biasing a silicon diode and a LEDat the output. What most likely will occur?

a. the LED wont light

b. the LED will blink and goes off

c. the LED light steadily

d. the LED changes its color from red, orange and then busted

19. ECG was developed by Wilhem Einthoven purposely to record hearts electricalactivity. What ECG type is capable of displaying the cross section of the valves andchambers of the heart?

a. M-mode

b. 2D-echo

c. 3D-echod. Cupid telescope


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20. A breakthrough in medical field when Wilhelm Roentgen developed X-ray in1895. X-ray is a diagnostic equipment using short wavelength of light thatpenetrate the body. Assuming your grandmother has scoliosis, what possible X-ray type that a radiologist will use?

a. myelogram

b. arthrogramc. scoliogram

d. lolagram

21. MOS family used extensively where lowest power consumption is necessary is

a. PMOSb. NMOS

c. CMOS

d. GMOS

22. In a system with MOS devices, the main bus loading factor is likely to be:

a. resistive

b. currentc. capacitive

d. inductive


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23. When a logic circuit rejects an unwanted signal, this is termed as______.

a. logic levels

b. noise margin

c. power consumption

d. propagation delay

24.The connecting leads of an IC chip is made of ___________.

a. aluminum

b. gold

c. silver

d. copper

25. A circuit that converts its input to its complement.

a. inverter

b. NOR gate with inputs tied together

c. NAND gate with inputs tied together

d. all of the above

26. How many NAND gates are needed to form an AND gate?

a. 1

b. 2

c. 3

d. 4


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27. MOS family that dominates the LSI field

a. CMOS

b. PMOS

c. GMOS

d. NMOS

28. Breaking capacity of a circuit breaker is usually expressed in terms of

a. MVA

b. Amperes

c. volts

d. MW

29. the illumination is directly proportional to the cosine of the angle made by the normal to theilluminated surface with the direction of the incident flux This statement is associated with

a. Plancks Trigo Law

b. Lamberts Cosine Law

c. Macbeths law of associated lighting

d. Kagibuyos flux emission


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30. 1991 saw the 'Tequila' virus outbreak. It was the first virus that could change itssignature (binary pattern) with each new replication in an attempt to escapedetection from antivirus software. What's the term for this type of virus?

a. alcoholic

b. polymorphic

c. geneophic

d. Transmutant

31. A current surge takes place when a power supply is first tuned in because

a. transformer core is suddenly magnetized

b. the diodes suddenly start to conduct

c. the filter capacitor must be initially chargedd. arcing takes place in the switch

32. For a good 0.05 uF paper capacitor, the ohmmeter reading should

a. Go quickly to 100 ohms approximately and remain there

b. show low resistance momentarily and back off to a very high resistance

c. show high resistance momentarily and then a very low resistance

d. the pointer does not move at all

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Review Questions in Electronics.ppt