transistor audio power amplifiers MCQs – Page 2

Practise focused transistor audio power amplifiers questions with marked answers for exam preparation and subject revision.

transistor audio power amplifiers Mcqs
21. Class _____________ operation gives the maximum distortion?
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A. A

B. AB

C. B

D. C
22. If a transistor is operated in such a way that output current flows for 60o of the input signal, then it is ______________ operation?
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A. Class B

B. None of the above

C. Class C

D. Class A

23. 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 ?
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A. 40 W

B. 20 W

C. 10 W

D. 80 W

24. The output transformer used in a power amplifier is a _____________ transformer?
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A. 1:1 ratio

B. None of the above

C. Step-down

D. Step-up

25. The disadvantage of impedance matching is that it _______________?
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A. Gives distorted output

B. None of the above

C. Requires a transformer

D. Gives low power output

26. The push-pull circuit must use ______________ operation?
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A. Class B

B. Class A

C. Class C

D. Class AB

27. In class A operation, the operating point is generally located_____________of the d.c. load line?
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A. None of the above

B. At cut off point

C. At the middle

D. At saturation point

28. For the same a.c. power output as above, what should be the minimum power rating of transistor for class B operation?
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A. 10 W

B. 8 W

C. 4 W

D. None of the above

29. A 2-transistor class B power amplifier is commonly called ______________ amplifier?
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A. Push-pull

B. Differential

C. Symmetrical

D. Dual

30. The most important consideration in power amplifier is __________________?
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A. To keep the transformer cool

B. None of the above

C. Collector efficiency

D. Biasing the circuit

31. The maximum efficiency of resistance loaded class A power amplifier is _________________?
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A. 50%

B. 30%

C. 5%

D. 25%
32. If the zero signal dissipation of a transistor is 1W, then power rating of the transistor should be at least___________________?
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A. 5 W

B. 33 W

C. 1 W

D. 75 W

33. The output stage of a multistage amplifier usually employs _________________?
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A. Class A power amplifier

B. Preamplifier

C. None of the above

D. Push-pull amplifier
34. The output stage of a multistage amplifier usually employs______________?
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A. Push-pull amplifier

B. None of the above

C. Preamplifier

D. Class A power amplifier

35. A class A power amplifier is sometimes called______________amplifier?
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A. Symmetrical

B. Single-ended

C. Differential

D. Reciprocating

36. The maximum collector efficiency of class B operation is ________________?
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A. 5%

B. 5%

C. 50%

D. 90%

37. An AF amplifier is shielded to ________________?
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A. Keep the amplifier cool

B. Prevent induction due to stray magnetic fields

C. Protect from rusting

D. None of the above

38. 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 ?
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A. 5 W

B. 10 W

C. 20 W

D. 15 W

39. The maximum efficiency of transformer coupled class A power amplifier is _______________?
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A. 80%

B. 50%

C. 45%

D. 30%

40. The pulsating d.c. applied to power amplifier causes________________?
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A. Hum in the circuit

B. Excessive forward voltage

C. Burning of transistor

D. None of the above