semiconductor diode MCQs – Page 2

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

semiconductor diode Mcqs
21. A crystal diode is a ________________device?
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A. none of the above

B. non-linear

C. bilateral

D. linear

22. The knee voltage of a crystal diode is approximately equal to ________________?
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A. breakdown voltage

B. barrier potential

C. applied voltage

D. forward voltage

23. If the arrow of crystal diode symbol is positive w.r.t. bar, then diode is _____________biased?
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A. none of the above

B. reverse

C. forward

D. either forward or reverse

24. A crystal diode utilises .. characteristic for rectification
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A. reverse

B. forward or reverse

C. none of the above

D. forward
25. A zener diode is used as ______________?
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A. a rectifier

B. a multivibrator

C. a voltage regulator

D. an amplifier

26. A series resistance is connected in the zener circuit to_______________?
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A. none of the above

B. protect the zener

C. properly reverse bias the zener

D. properly forward bias the zener

27. A 10 V power supply would use ____________ as filter capacitor?
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A. air capacitor

B. electrolytic capacitor

C. paper capacitor

D. mica capacitor

28. A zener diode has ________________?
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A. three pn junctions

B. two pn junctions

C. one pn junction

D. none of the above

29. If the a.c. input to a half-wave rectifier is an r.m.s value of 400/?2 volts, then diode PIV rating is__________________?
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A. 400 x ?2 V

B. 400/?2 V

C. 400 V

D. none of the above

30. When the crystal current diode current is large, the bias is ______________?
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A. forward

B. reverse

C. inverse

D. poor

31. ____________ rectifier has the lowest forward resistance?
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A. vacuum tube

B. none of the above

C. solid state

D. gas tube

32. If the doping level in a crystal diode is increased, the width of depletion layer_____________?
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A. in increased

B. is decreased

C. none of the above

D. remains the same

33. When the graph between current through and voltage across a device is a straight line, the device is referred to as _______________?
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A. passive

B. nonlinear

C. active

D. linear
34. The maximum efficiency of a half-wave rectifier is _____________?
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A. 81.20%

B. 50%

C. 40.6 %

D. 25%

35. The d.c. resistance of a crystal diode is ______________ its a.c. resistance?
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A. none of the above

B. the same as

C. more than

D. less than
36. The ratio of reverse resistance and forward resistance of a germanium crystal diode is about ______________?
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A. 1000:01:00

B. 40,000 : 1

C. 1:01

D. 100:01:00

37. A zener diode is always_______________ connected?
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A. reverse

B. none of the above

C. forward

D. either reverse or forward

38. _____________ filter circuit results in the best voltage regulation?
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A. none of the above

B. resistance input

C. capacitor input

D. choke input
39. A zener diode is________________ device?
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A. a linear

B. none of the above

C. an amplifying

D. a non-linear
40. The forward voltage drop across a silicon diode is about _______________?
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A. 0.7 V

B. 3 V

C. 10 V

D. 2.5 V