BJT MCQ

71. In a UJT, intrinsic stand-off ratio n is typically

  1. 0.2
  2. 0.4
  3. 0.7
  4. 0.99
Answer
Answer. c

72. A transistor in common emitter mode has

  1. A high input resistance and  a high output resistance
  2. A very low input resistance and a low output resistance
  3. A medium input resistance and high output resistance
  4. A high input resistance and low output resistance
Answer
Answer. d

73. In a transistor which of the following is very lightly doped and is very thin

  1. Emitter
  2. Base
  3. Collector
  4. None of these
Answer
Answer. b

74. A bipolar junction transistor with forward current transfer ratio α = 0.98, when working in CE mode, provides current transfer ratio β as

  1. 98
  2. 0.02
  3. 49
  4. 0.49
Answer
Answer. c

75. Transistor transconductance, Gm, is

  1. Directly proportional to current and inversely proportional to temperature.
  2. Directly proportional to both current and temperature.
  3. Inversely proportional to current and directly proportional to temperature.
  4. Inversely proportional to both current and temperature.
Answer
Answer. a

76. When a BJT is used as a switch, its mode of operation switches between

  1. Cut-off and active regions
  2. Cut-off and saturation regions
  3. Active and saturation regions
  4. Different operating points in the active region
Answer
Answer. b

77. A BJT is in inverse active mode if

  1. E-B junction is reverse biased and C-B junction is forward biased
  2. Both E-B junction and C-B junction are forward biased.
  3. Both E-B junction and C-B junction are reverse biased.
  4. Operation of the device is very poor.
Answer
Answer. a

78. What would be the value of IB for a properly biased PNP transistor if it is given that IC = 10mA and IE = 10.2mA?

  1. 0.2 μA
  2. 2 μA
  3. 0.002 μA
  4. 200 μA
Answer
Answer. d

79. Which of the following is not a possible BJT configuration?

  1. Common base configuration
  2. Common emitter configuration
  3. Common current configuration
  4. Common collector configuration
Answer
Answer. c

80. The equivalent circuit of a bipolar junction transistor contains

  1. Independent sources
  2. Dependent sources
  3. Dependent sources and resistances
  4. None of the options
Answer
Answer. c
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