Solid State Devices

81. FET has a pinch-off voltage of about

  1. 0.5 V
  2. 5 V
  3. 10 V
  4. 20 V

Correct answer: (B)
5 V

82. For a full-wave rectifier, the output frequency

  1. Equals one-half the input frequency
  2. Equals the line frequency
  3. Equals two times the input
  4. Is three times the line frequency

Correct answer: (C)
Equals two times the input

83. For either germanium or silicon diodes, the barrier potential decreases _________ for each Celsius degree rise.

  1. 1 mV
  2. 3 mV
  3. 4 mV
  4. 2 Mv

Correct answer: (D)
2 Mv

84. Gallium arsenide, aluminum arsenide and gallium phosphide are classified as

  1. Elementary semiconductor
  2. Secondary semiconductor
  3. Intrinsic material made by doping
  4. Insulators

Correct answer: (B)
Secondary semiconductor

85. How many electrons are there in the fourth orbit of a copper atom?

  1. 1
  2. 2
  3. 3
  4. 4

Correct answer: (A)
1

86. How many protons does the nucleus of a silicon atom contain?

  1. 4
  2. 14
  3. 29
  4. 32

Correct answer: (D)
32

87. How much voltage would you measure across the base-emitter junction of a silicon transistor at class A?

  1. 0 V
  2. 0.3 V
  3. 3.6 V
  4. 0.7 V

Correct answer: (D)
0.7 V

88. If the input frequency of a full-wave rectifier is 400 Hertz, the ripple frequency will be _________.

  1. Twice as great as the input frequency
  2. Equal to the input frequency divided by two
  3. Quadruple of the input frequency
  4. Equal to a quarter of its input frequency

Correct answer: (A)
Twice as great as the input frequency

89. If the input power of a half wave rectifier has a frequency of 400 Hertz, then the ripple frequency will be equal to _________.

  1. 800 Hertz
  2. 200 Hertz
  3. 100 Hertz
  4. 400 Hertz

Correct answer: (D)
400 Hertz

90. If the line frequency is 60 Hz, the output frequency of a bridge rectifier is

  1. 30 Hz
  2. 60 Hz
  3. 120 Hz
  4. 240 Hz

Correct answer: (C)
120 Hz

Previous
Page 9 of 30
Next
Copyright © EngineeringMCQ.com