Below are the answers key for Frenzel Self-test in Chapter 9: Antennas and Transmission Lines 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. balanced, coax
2. unbalanced
3. wavelength
4. 0.667
5. 1.475
6. characteristic or surge impedance
7. low-pass filter, capacitors, inductors
8. 75.23
9. 6.25
10. 52
11. constant or fiat
12. standing waves
13. reflected
14. standing waves
15. 1.44
16. 1
17. open, shorted
18. reflection coefficient
19. 1.67,0.25
20. 7
21. 1, infinity
22. tuned or resonant circuits
23. 6.3 [0.07(90)=6.3] (See Fig. 9-12.)
24. high or infinite
25. open, shorted
26. inductors, capacitors
27. series
28. 2.788
29. electric, magnetic
30. electric field
31. transmission or feed line
32. vertically
33. dipole or doublet
34. 3.12
35. 73
36. figure eight
37. beam width
38. omni directional
39. ground plane
40. 3.16
41. earth ground, radials
42. circle
43. 36.5
44. bidirectional
45. one
46. gain
47. elements
48. parasitic, driven
49. director, reflector, driven element
50. director, reflector
51. director
52. 20, 40
53. 2.1
54. collinear, end-fire, broadside
55. true
56. log-periodic
57. antenna tuner
58. balun
59.Q section, matching stub
60. 60.4:1
61. 9.39
62. ground or surface wave, sky wave, direct or space wave
63. ground, surface
64. sky
65. 65. direct or space
66. 3
67. ionosphere
68. F
69. refracted or bent
70. true
71. false
72. 3, 30
73. multiple hop
74. straight line
75. repeaters
76. transmitter, receiver
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