Below are the answers key for Multiple Choice Questions in Chapter 6: Radio Receivers from the book Electronic Communication Systems by George Kennedy. Make sure to familiarize each and every questions to increase the chance of passing the ECE Board Exam.
1. c. Greater limiting
2. a. The circuit is always biased in class C, by virtue of the leak-type bias.
3. a. an increase in signal strength produces more AGC
4. b. mixer input must be tuned to the signal frequency
5. b. variable sensitivity
6. d. 2100 kHz
7. a. the linearity is worse than in phase discriminator
8. a. an audio amplifier when the carrier is absent
9. d. Variable sensitivity is used to eliminate selective fading
10. d. it is relatively free of spurious frequency
11. a. reduce the spurious frequency problem
12. d. Phase discriminator
13. b. reducing the effect of negative-peak clipping
14. b. insufficient gain and sensitivity
15. c. is not rejected be the IF tuned circuits
16. d. improve the rejection of the image frequency
17. a. blocking
18. b. the padder capacitor
19. d. to allow adequate frequency coverage without switching
20. d. tracking will be improved
21. c. negative-peak clipping
22. c. Bipolar transistor balanced modulator
23. b. adjacent-channel rejection is more difficult
24. c. it is unaffected by AGC derived from nearby transmissions
25. d. Single-sideband, full-carrier
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