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Transistor Audio Power Amplifiers
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Transistor Audio Power Amplifiers
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25 Questions

1. If a transistor is operated in such a way that output current flows for 60o of the input signal, then it is ............... operation
2. The maximum collector efficiency of class B operation is .................
3. The push-pull circuit must use ............... operation
4. Transformer coupling can be used in ............... amplifiers
5. An AF amplifier is shielded to ............
6. A class A power amplifier uses ............
7. The output stage of a multistage amplifier usually employs ...........
8. A 2-transistor class B power amplifier is commonly called ........... amplifier
9. 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?
10. If the gain versus frequency curve of a transistor amplifier is not flat, then there is distortion.
11. The disadvantage of impedance matching is that it ......................
12. The most important consideration in power amplifier is ...........
13. 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?
14. A power amplifier has comparatively ................. β
15. ................... coupling is generally employed in power amplifiers
16. 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?
17. Low efficiency of a power amplifier results in ...................
18. A class A power amplifier is sometimes called .............. amplifier
19. In class A operation, the operating point is generally located .......... of the d.c. load line.
20. The output stage of a multistage amplifier is also called ...............
21. Class C amplifiers are used as ................
22. The most costly coupling is .................. coupling
23. For the same a.c. power output as above, what should be the minimum power rating of transistor for class B operation?
24. The output signal voltage and current of a power amplifier are 5V and 200 mA; the values being r.m.s.  What is the power output?
25. Class....... power amplifier has the highest collector efficiency

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