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MCQs

Total Questions : 122 | Page 7 of 13 pages
Question 61. The leakage current in a silicon transistor is about ___________ the leakage current in a germanium transistor
  1.    One hundredth
  2.    One tenth
  3.    One thousandth
  4.    One millionth
 Discuss Question
Answer: Option C. -> One thousandth
Question 62. The Q of an LC circuit is given by ___________
  1.    2pfr x R
  2.    R / 2pfrL
  3.    2pfrL / R
  4.    R2/2pfrL
 Discuss Question
Answer: Option C. -> 2pfrL / R
Question 63. The biasing circuit has a stability factor of 50. If due to temperature change, ICBO changes by 1 µA, then IC will change by ___________
  1.    100 µA
  2.    25 µA
  3.    20 µA
  4.    50 µA
 Discuss Question
Answer: Option D. -> 50 µA
Question 64. Tuned class C amplifiers are used for RF signals of ___________
  1.    Low power
  2.    High power
  3.    Very high power
  4.    None of the above
 Discuss Question
Answer: Option D. -> None of the above
Question 65. A silicon transistor is biased with base resistor method. If ß=100, VBE =0.7 V, zero signal collector current IC = 1 mA and VCC = 6V , what is the value of the base resistor RB?
  1.    105 kΩ
  2.    530 kΩ
  3.    315 kΩ
  4.    None of the above
 Discuss Question
Answer: Option B. -> 530 kΩ
Question 66. In a npn transistor, ___________ are the minority carriers
  1.    free electrons
  2.    holes
  3.    donor ions
  4.    acceptor ions
 Discuss Question
Answer: Option B. -> holes
Question 67. ICEO = () ICBO
  1.    ß
  2.    1 + a
  3.    1 + ß
  4.    none of the above
 Discuss Question
Answer: Option C. -> 1 + ß
Question 68. In a pnp transistor, the current carriers are ___________
  1.    acceptor ions
  2.    donor ions
  3.    free electrons
  4.    holes
 Discuss Question
Answer: Option D. -> holes
Question 69. The base of a transistor is ___________ doped
  1.    heavily
  2.    moderately
  3.    lightly
  4.    none of the above
 Discuss Question
Answer: Option C. -> lightly
Question 70. The collector of a transistor is ___________ doped
  1.    heavily
  2.    moderately
  3.    lightly
  4.    none of the above
 Discuss Question
Answer: Option B. -> moderately

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