Below are the answers key for Frenzel Self-test in Chapter 3: Amplitude 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. a
2. b
3. c
4. gain, attenuation
5. square law
6. diode
7. tuned circuit
8. variable resistor
9. gain
10. increase, decrease, increase
11. resistor
12. 100 MHz
13. attenuator
14. low
15. linear amplifier
16. C
17. collector
18. supply voltage
19. 2.5
20. 12
21. driver
22. demodulator
23. diode detector
24.C1
25. ripple, distortion
26. envelope
27. smaller filter capacitor, less ripple and distortion
28. true
29. c
30. d
31. b
32. lattice modulator or diode ring
33. switches
34. 1897.4, 1902.6
35.Q7, Q8
36. switches
37. true
38. filter
39. selectivity
40. 2.9985
41. crystals
42. Use one filter for each sideband; select the carrier frequency so that the desired sideband is in the filter passband.
43.tune, resonant, or LC
44. 1.8 (3.0012- 3.0 = 0.0012 MHz = 1.2 kHz; 1.2 x 1.5 = 1.8 kHz)
45. vibrate or resonate
46. crystal
47. 200 to 500
48. phase shift
49. mixer or balanced modulator
50. product detector
51. b
52. b
53. b
54. heterodyning
55. frequency conversion or translation
56. f1 ,f2, f1 + f2, f1 - f2
57. diode
58. doubly balanced mixer, GaAsFET
59. gain
60. 455 (1845 – 1390 = 455)
61. converter
62. cross-connected differential amplifier
63. local oscillator
64. 21.3 or 32.3 MHz
65. true
66. true
Post a Comment