Below are the answers key for Multiple Choice Questions in Chapter 12: Power Amplifiers from the book Electronic Principles 7th Edition by Albert Malvino. Make sure to familiarize each and every questions to increase the chance of passing the ECE Board Exam.
1. b. Approximately equal to one
2. c. re + re'
3. b. High
4. b. VE divided by RE
5. d. Emitter diode and external ac emitter resistance
6. c. Load resistor
7. a. 30 kohm
8. a. Less than the generator voltage
9. d. Vin divided by re
10. c. Vin
11. c. Steeper than the dc load line
12. d. Clipped
13. d. Negative half cycle of input
14. b. 2 V
15. c. DC emitter resistance
16. c. 0.9
17. d. Clipping on both peaks
18. c. A very high current gain
19. b. Different from the dc load line
20. a. 5 mV
21. a. Only ac voltages
22. d. DC base voltage is zero
23. a. Very low
24. d. High when clipping occurs
25. a. 0
26. c. 800 kohm
27. a. Cutoff
28. d. Usually destructive
29. b. Is usually small enough to ignore
30. c. Crossover distortion
31. b. Smaller than the output current
32. d. All of the above
33. d. Match the compensating diodes
34. c. 78.5 percent
35. d. Is usually less than the load resistance
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