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EE AND ECE IMPORTANT - Transistor Audio Power Amplifiers MCQs
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EE AND ECE IMPORTANT - Transistor Audio Power Amplifiers MCQs
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25 Questions

1. When no signal is applied, the approximate collector efficiency of class A power amplifier is …….
2. Class C amplifiers are used as …………….
3. The push-pull circuit must use …………… operation
4. In class A operation, the operating point is generally located ………. of the d.c. load line.
5. Transformer coupling can be used in …………… amplifiers
6. A transformer coupled class A power amplifier has a loadof 100 Ω on the secondary. If the turn ratio is 10:1, what is the value of load appearing on the primary?
7. Power amplifiers handle …………. signals compare to voltage amplifiers
8. The pulsating d.c. applied to power amplifier causes ……………..
9. When a transistor is cut off……………..
10. A power amplifier has comparatively …………….. β
11. Low efficiency of a power amplifier results in ……………….
12. The driver stage usually employs………….
13. The maximum collector efficiency of class B operation is ……………..
14. If a transistor is operated in such a way that output current flows for 60o of the input signal, then it is …………… operation
15. The output stage of a multistage amplifier usually employs ………..
16. For the same a.c. power output as above, what should be the minimum power rating of transistor for class B operation?
17. The maximum efficiency of transformer coupled class A power amplifier is ………………
18. A class A power amplifier uses …………
19. What will be the collector efficiency of a power amplifier having zero signal power dissipation of 5 watts and a.c. power output of 2 watts?
20. A class A power amplifier is sometimes called ………….. amplifier
21. Class ………….. operation gives the maximum distortion
22. If the gain versus frequency curve of a transistor amplifier is not flat, then there is distortion.
23. The most important consideration in power amplifier is ………..
24. 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 ?
25. What turn ratio (Np/Ns) of transformer is required to match 4 Ω speaker to a transistor having an output impedance of 8000 Ω?

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