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MCQs

Total Questions : 163 | Page 3 of 17 pages
Question 21. 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 22. 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%
Question 23. What turn ratio (Np/Ns) of transformer is required to match 4 Ω speaker to a transistor having an output impedance of 8000 O?
  1.    2
  2.    7
  3.    3
  4.    None of the above
 Discuss Question
Answer: Option B. -> 7
Question 24. The most important consideration in power amplifier is ___________
  1.    Biasing the circuit
  2.    Collector efficiency
  3.    To keep the transformer cool
  4.    None of the above
 Discuss Question
Answer: Option B. -> Collector efficiency
Question 25. The size of a power transistor is made considerably large to ___________
  1.    Provide easy handling
  2.    Dissipate heat
  3.    Facilitate connections
  4.    None of the above
 Discuss Question
Answer: Option B. -> Dissipate heat
Question 26. If the power rating of a transistor is 1W and collector current is 100mA, then maximum allowable collector voltage is ___________
  1.    1V
  2.    100V
  3.    20V
  4.    10V
 Discuss Question
Answer: Option D. -> 10V
Question 27. The output stage of a multistage amplifier is also called ___________
  1.    Mixer stage
  2.    Power stage
  3.    Detector stage
  4.    F stage
 Discuss Question
Answer: Option B. -> Power stage
Question 28. Power amplifiers handle ___________ signals compare to voltage amplifiers
  1.    Small
  2.    Very small
  3.    Large
  4.    None of the above
 Discuss Question
Answer: Option C. -> Large
Question 29. The pulsating d.c. applied to power amplifier causes ___________
  1.    Burning of transistor
  2.    Hum in the circuit
  3.    Excessive forward voltage
  4.    None of the above
 Discuss Question
Answer: Option B. -> Hum in the circuit
Question 30. For the same a.c. power output as above, what should be the minimum power rating of transistor for class B operation?
  1.    10 W
  2.    4 W
  3.    8 W
  4.    None of the above
 Discuss Question
Answer: Option B. -> 4 W

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