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Transistor Audio Power Amplifiers
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Transistor Audio Power Amplifiers
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25 Questions

1. If the gain versus frequency curve of a transistor amplifier is not flat, then there is distortion.
2. If the zero signal dissipation of a transistor is 1W, then power rating of the transistor should be at least ...................
3. Class .............. operation gives the maximum distortion
4. 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?
5. The output stage of a multistage amplifier usually employs ...........
6. Class C amplifiers are used as ................
7. Low efficiency of a power amplifier results in ...................
8. 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?
9. The maximum efficiency of resistance loaded class A power amplifier is ........
10. The output stage of a multistage amplifier is also called ...............
11. A power amplifier has comparatively ................. β
12. ................... coupling is generally employed in power amplifiers
13. A class A power amplifier uses ............
14. A transformer coupled class A power amplifier has a load of 100 Ω on  the secondary. If the turn ratio is 10:1, what is the value of load appearing on the primary?
15. 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 ?
16. A 2-transistor class B power amplifier is commonly called ........... amplifier
17. An AF amplifier is shielded to ............
18. Power amplifiers handle ............. signals compare to voltage amplifiers
19. The maximum efficiency of transformer coupled class A power amplifier is ..................
20. When no signal is applied, the approximate collector efficiency of class A power amplifier is .......
21. Power amplifiers generally use transformer coupling because transformer permits........
22. Class....... power amplifier has the highest collector efficiency
23. When a transistor is cut off.................
24. The pulsating d.c. applied to power amplifier causes .................
25. The output transformer used in a power amplifier is a ................ transformer

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