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MCQs

Total Questions : 163 | Page 5 of 17 pages
Question 41. The class B push-pull circuit can deliver 100 W of a.c. output power. What should be the minimum power rating of each transistor?
  1.    20 W
  2.    40 W
  3.    10 W
  4.    80 W
 Discuss Question
Answer: Option A. -> 20 W
Question 42. The maximum efficiency of resistance loaded class A power amplifier is
  1.    5%
  2.    50%
  3.    30%
  4.    25%
 Discuss Question
Answer: Option D. -> 25%
Question 43. The disadvantage of impedance matching is that it ___________
  1.    Gives distorted output
  2.    Gives low power output
  3.    Requires a transformer
  4.    None of the above
 Discuss Question
Answer: Option A. -> Gives distorted output
Question 44. In class A operation, the operating point is generally located ___________ of the d.c. load line.
  1.    At cut off point
  2.    At the middle
  3.    At saturation point
  4.    None of the above
 Discuss Question
Answer: Option B. -> At the middle
Question 45. The output transformer used in a power amplifier is a ___________ transformer
  1.    1:1 ratio
  2.    Step-up
  3.    Step-down
  4.    None of the above
 Discuss Question
Answer: Option C. -> Step-down
Question 46. A 2-transistor class B power amplifier is commonly called ___________ amplifier
  1.    Dual
  2.    Push-pull
  3.    Symmetrical
  4.    Differential
 Discuss Question
Answer: Option B. -> Push-pull
Question 47. Transformer coupling can be used in ___________ amplifiers
  1.    Either power or voltage
  2.    Only power
  3.    Only voltage
  4.    None of the above
 Discuss Question
Answer: Option A. -> Either power or voltage
Question 48. A class A power amplifier is sometimes called ___________ amplifier
  1.    Symmetrical
  2.    Single-ended
  3.    Reciprocating
  4.    Differential
 Discuss Question
Answer: Option B. -> Single-ended
Question 49. If a transistor is operated in such a way that output current flows for 60° of the input signal, then it is ___________ operation
  1.    Class A
  2.    Class B
  3.    Class C
  4.    None of the above
 Discuss Question
Answer: Option C. -> Class C
Question 50. The push-pull circuit must use ___________ operation
  1.    Class A
  2.    Class C
  3.    Class B
  4.    Class AB
 Discuss Question
Answer: Option C. -> Class B

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