Frenzel Self-test in Frequency Modulation Circuits – Answers

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

Complete List of Self-test and Reviewers in Communications Electronics