Below are the answers key for the 100 items set of Practice Examination 3 in Communications Engineering composed of previous Board Exams Questions and cautiously selected questions from various topics in Communications Engineering (Electronics Systems and Technology) that could possibly be given in the board.
1. 100 Ω
2. 156 Ω
3. Single line wire
4. 6 dB
5. Balun
6. 75 Ω
7. 3
8. Shannon-Hartley theorem
9. Duplex
10. 15 to 160 Mhz
11. 290 Kelvin
12. 800 Hz
13. Quantizing level
14. Noise
15. NPR
16. pWp
17. 50%
18. A3J
19. Limiter
20. Much better noise immunity
21. 71
22. Constant peak amplitude
23. H3E
24. Class C
25. Varying of some parameters of a carrier such as its amplitude to transmit information
26. Assures that the telephone is working
27. 0 dBm
28. 36 CCS
29. Facsimile
30. 100
31. 1 TU
32. Refraction
33. Maximum usable frequency
34. James Clerk Maxwell
35. Ionospheric scatter
36. F2
37. Wavelength
38. F layer
39. 8500 km
40. Vertical
41. Azimuth
42. Rhombic
43. Orthomode transducer
44. 10.89 times
45. Standing waves
46. 200 kph
47. 3
48. Dummy antenna
49. Antenna
50. 42.9 MHz
51. Two-way simultaneous transmission
52. Polling
53. They have clock recovery circuits
54. 2B+D
55. Data communication equipment
56. STX
57. To protect small signals in PCM from quantizing distortion
58. Is concerned with the boundaries between characters
59. Spectral analysis
60. X.75
61. Asynchronous
62. Folding frequency
63. Baseband
64. Huffman code
65. Shannon-hartley theorem
66. Totally different
67. Sampling, quantizing, and coding
68. Duplex
69. LNB
70. Gallium Arsenide solar panel
71. Satellite radiation pattern
72. 38
73. 0.38 dB
74. LED
75. Step-index multimode
76. 800 THz
77. 50,000 h
78. Sound intensity
79. Flanking transmission
80. 89.1 dB
81. Fundamental
82. 10 log I/I(ref)
83. Diffraction
84. Volume unit meter
85. 995 to 2055 KHz
86. Low band VHF
87. Antenna
88. Pan/tilt device
89. 5
90. 52 µs
91. Due to water vapor and oxygen
92. Distances involved are greater
93. 60 GHz
94. Radio detection and ranging
95. Terrestrial link
96. Shorten waveguide link
97. PD 223
98. E.O. No. 266
99. Act. No.`3846
100. Log
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