Below are the answers key for Frenzel Self-test in Chapter 5: Frequency Modulation Circuits 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. b (decrease)
2. b (decrease)
3. b (decrease)
4. a (increase)
5. a (increase)
6. varactor diode (or varicap)
7. 1,200
8. frequency stability
9. voltage-controlled oscillator
10. VXO
11. frequency multiplier
12. increase
13. resistance, capacitance
14. true
15. false
16. false
17. true
18. indirect
19. true
20. 0, 90
21. resistance, capacitance
22. parallel resonant (or tuned)
23. varactor
24.R04
25. lead
26. decrease
27.C1, C2, Q1 and C1, R1, Q1
28. frequency multiplier
29. phase shift
30. one-shot or monostable multivibrator
31. increase
32. 90
33. lead
34. differential amplifier
35. phase shift
36. low-pass filter
37. peak detector
38.C1, C2, L1
39. phase detector, VCO, low-pass filter
40. phase detector, frequency, phase
41. VCO
42. error
43. lock
44. free-running
45. capture
46. band pass filter
47. modulating signal or information signal
48. FM input
49. true
50. false
51. false
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