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semiconductor diode MCQs

Practise focused semiconductor diode questions with marked answers for exam preparation and subject revision.

semiconductor diode Mcqs
1. The reverse current in a diode is of the order of _____________?
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A. mA

B. ?A

C. A

D. kA

2. The doping level in a zener diode is______________ that of a crystal diode?
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A. more than

B. the same as

C. less than

D. none of the above

3. A zener diode has ______________ breakdown voltage?
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A. zero

B. none of the above

C. sharp

D. undefined

4. If the PIV rating of a diode is exceeded,_______________?
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A. the diode is destroyed

B. the diode behaves like a zener diode

C. none of the above

D. the diode conducts poorly

5. A crystal diode has______________?
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A. two pn junctions

B. none of the above

C. three pn junctions

D. one pn junction
6. If the doping level of a crystal diode is increased, the breakdown voltage__________________?
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A. remains the same

B. none of the above

C. is decreased

D. is increased

7. Mains a.c. power is converrted into d.c. power for_________________?
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A. using in electronic equipment

B. lighting purposes

C. heaters

D. none of the above

8. A zener diode is destroyed if it______________?
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A. carrier more than rated current

B. is forward biased

C. is reverse biased

D. none of the above

9. A crystal diode has forward resistance of the order of ________________?
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A. ?

B. none of the above

C. k?

D. M?

10. The ripple factor of a half-wave rectifier is_________________?
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A. 2.5

B. 2

C. 0.48

D. 1.21

11. A crystal diode is used as______________?
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A. a voltage regulator

B. an oscillator

C. a rectifier

D. an amplifier

12. If the temperature of a crystal diode increases, then leakage current ______________?
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A. becomes zero

B. increases

C. decreases

D. remains the same

13. A half-wave rectifier has an input voltage of 240 V r.m.s. If the step-down transformer has a turns ratio of 8:1, what is the peak load voltage? Ignore diode drop?
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A. 42.5 V

B. 30 V

C. 86.5 V

D. 27.5 V

14. The most widely used rectifier is ________________?
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A. bridge full-wave rectifier

B. none of the above

C. centre-tap full-wave rectifier

D. half-wave rectifier

15. When a crystal diode is used as a rectifier, the most important consideration is ____________?
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A. reverse characteristic

B. PIC rating

C. doping level

D. forward characteristic

16. The leakage current in a crystal diode is due to _________________?
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A. minority carriers

B. none of the above

C. junction capacitance

D. majority carriers

17. A zener diode utilizes ______________ characteristics for its operation?
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A. forward

B. reverse

C. both forward and reverse

D. none of the above

18. The PIV rating of each diode in a bridge rectifier is ___________that of the equivalent center-tap rectifier?
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A. twice

B. the same as

C. one-half

D. four times

19. For the same secondary voltage, the output voltage from a centre-tap rectifier is___________ than that of bridge rectifier?
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A. four time

B. twice

C. thrice

D. one-half
20. In the breakdown region, a zener didoe behaves like a _______________source?
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A. none of the above

B. constant current

C. constant voltage

D. constant resistance