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MCQs

Total Questions : 163 | Page 6 of 17 pages
Question 51. The most costly coupling is ___________ coupling
  1.    RC
  2.    Direct
  3.    Impedance
  4.    Transformer
 Discuss Question
Answer: Option D. -> Transformer
Question 52. When no signal is applied, the approximate collector efficiency of class A power amplifier is
  1.    10%
  2.    0%
  3.    25%
  4.    50%
 Discuss Question
Answer: Option B. -> 0%
Question 53. If the zero signal dissipation of a transistor is 1W, then power rating of the transistor should be at least ___________
  1.    5 W
  2.    33 W
  3.    75 W
  4.    1 W
 Discuss Question
Answer: Option D. -> 1 W
Question 54. The maximum collector efficiency of class B operation is ___________
  1.    50%
  2.    90%
  3.    5%
  4.    5%
 Discuss Question
Answer: Option D. -> 5%
Question 55. Class C power amplifier has the highest collector efficiency
  1.    C
  2.    A
  3.    B
  4.    AB
 Discuss Question
Answer: Option A. -> C
Question 56. An AF amplifier is shielded to ___________
  1.    Keep the amplifier cool
  2.    Protect from rusting
  3.    Prevent induction due to stray magnetic fields
  4.    None of the above
 Discuss Question
Answer: Option C. -> Prevent induction due to stray magnetic fields
Question 57. Class ___________ operation gives the maximum distortion
  1.    A
  2.    B
  3.    C
  4.    AB
 Discuss Question
Answer: Option C. -> C
Question 58. The maximum a.c. power output from a class A power amplifier is 10 W. What should be the minimum power rating of the transistor used ?
  1.    10 W
  2.    15 W
  3.    5 W
  4.    20 W
 Discuss Question
Answer: Option D. -> 20 W
Question 59. A class A power amplifier uses ___________
  1.    Two transistors
  2.    Three transistors
  3.    One transistor
  4.    None of the above
 Discuss Question
Answer: Option C. -> One transistor
Question 60. The maximum efficiency of transformer coupled class A power amplifier is ___________
  1.    30%
  2.    50%
  3.    80%
  4.    45%
 Discuss Question
Answer: Option B. -> 50%

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