(Last Updated On: February 9, 2020)
Below are the answers key for Frenzel Self-test in Chapter 4: Frequency Modulation from the book COMMUNICATIONS ELECTRONICS by Louis E. Frenzel. Make sure to familiarize each and every questions to increase the chance of passing the ECE Board Exam.
1. angle
2. true
3. deviation
4. amplitude
5. increases, decreases (the reverse could also be true)
6. phase shift
7. frequency shift or deviation
8. changing or varying
9. amplitude, frequency
10. a
11. b
12. indirect FM
13. true
14. modulation index
15.3 (m = 10/33 = 3)
16. 5
17. 995.5, 1004.5 [3(1.5) = 4.5 KHz; 1000 4.5 = 995.5 and 1004.5 kHz]
18. 0.28
19. Bessel functions
20. 60 [2(5)(6)= 60 kHz]
21. 75 [(3.75/5)100 = 75%]
22. phase inversion or 180° shift
23. false
24. BW = 40 kHz; BW = 28 kHz using Carson’s rule; Carson’s rule gives narrower bandwidths because sidebands of less than 2 percent amplitude are not considered
25. noise
26. a
27. limiter (or clipper)
28. capture effect
29. C
30. spectrum space
31. false
32. high
33. pre-emphasis
34. high-pass filter
35. de-emphasis
36. 75
37. 2122
Complete List of Self-test and Reviewers in Communications Electronics
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