Semiconductor Diode

31. The doping level in a zener diode is __________ that of a crystal diode

  1. the same as
  2. less than
  3. more than
  4. none of the above

Correct answer: (C)
more than

32. The forward voltage drop across a silicon diode is about __________

  1. 2.5 V
  2. 3 V
  3. 10 V
  4. 0.7 V

Correct answer: (D)
0.7 V

33. The knee voltage of a crystal diode is approximately equal to __________

  1. applied voltage
  2. breakdown voltage
  3. forward voltage
  4. barrier potential

Correct answer: (D)
barrier potential

34. The leakage current in a crystal diode is due to __________

  1. minority carriers
  2. majority carriers
  3. junction capacitance
  4. none of the above

Correct answer: (A)
minority carriers

35. The maximum efficiency of a half-wave rectifier is __________

  1. 40.6 %
  2. 81.2 %
  3. 50 %
  4. 25 %

Correct answer: (A)
40.6 %

36. The most widely used rectifier is __________

  1. half-wave rectifier
  2. centre-tap full-wave rectifier
  3. bridge full-wave rectifier
  4. none of the above

Correct answer: (C)
bridge full-wave rectifier

37. The PIV rating of a crystal diode is __________ that of equivalent vacuum diode

  1. the same as
  2. lower than
  3. more than
  4. none of the above

Correct answer: (B)
lower than

38. The PIV rating of each diode in a bridge rectifier is __________ that of the equivalent centre-tap rectifier

  1. one-half
  2. the same as
  3. twice
  4. four times

Correct answer: (A)
one-half

39. The ratio of reverse resistance and forward resistance of a germanium crystal diode is about __________

  1. 1 : 1
  2. 100 : 1
  3. 1000 : 1
  4. 40,000 : 1

Correct answer: (D)
40,000 : 1

40. The reverse current in a diode is of the order of __________

  1. kA
  2. mA
  3. μA
  4. A

Correct answer: (C)
μA

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