BJT MCQ

61. Improper biasing of a transistor leads to

  1. Excessive heat production at the collector terminal
  2. Distortion in an output signal
  3. Faulty location of the load line
  4. Heavy loading of the emitter terminal
Answer
Answer. b

62. LED gives of visible light from

  1. Region off depletion layer
  2. p region alone
  3. n region alone
  4. Both p and n regions
Answer
Answer. a

63. Base of the bipolar junction transistor is

  1. Larger than emitter
  2. Larger than collector
  3. Smaller than emitter and collector
  4. Larger than emitter but smaller than collector
Answer
Answer. c

64. The smallest of the four h-parameter of the transistor is

  1. hi
  2. hr
  3. ho
  4. hf
Answer
Answer. c

65. Which of the following biasing is mostly used for BJT

  1. Fixed biasing
  2. Voltage divider
  3. Collector to base biasing
  4. Fixed blasting with emitter resistance
Answer
Answer. b

66. The positive swing of the output signal in a transistor circuit starts clipping first when Q-point of the circuit moves

  1. To the center of the load line
  2. Two-third way up the load line
  3. Towards the saturation point
  4. Towards the cut-off point
Answer
Answer. c

67. When a transistor is fully switched ON, it is said to be

  1. Shorted
  2. Saturated
  3. Open
  4. Cut-off
Answer
Answer. b

68. The impurity commonly used for realizing the base region of a silicon NPN transistor is

  1. Silicon
  2. Antimony
  3. Germanium
  4. Boron
Answer
Answer. d

69. In a BJT, the base spreading resistance is of the order of

  1. 10 Ω
  2. 10 Ω
  3. 100 Ω
  4. 1000 Ω
Answer
Answer. c

70. Input impedance of BJT is

  1. Higher than that of FET
  2. Lower than that of FET
  3. Depends upon the type of usage
  4. Same as that of FET
Answer
Answer. b
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