Below are the answers key for the 100 items set of Practice Examination 9 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. Timbre
2. 3300 m/s
3. 20 phons
4. 2λ to 8λ
5. 3100 kHz
6. 800
7. Effective Isotropic Radiated Power (EIRP)
8. Effective Radiated Power (ERP)
9. Gain-to-Equivalent Noise Temperature Ratio (G/Te)
10. Space noise
11. Hoghorn
12. 24
13. Space Division Multiplexing (SDM)
14. T2 carrier system
15. Metric
16. Spin stabilization
17. Membrane absorber
18. Syncom III
19. Calculate load admittance
20. A specially configured coaxial transmission line
21. Emission
22. 1887
23. Attenuation of radio wave
24. A parallel LC circuit
25. Courier
26. RA 9292
27. The President
28. 5
29. Within 15 days
30. 1
31. All of the choices
32. Solid
33. 1
34. Both A and C above
35. A 125-μs frame
36. L carrier
37. 564 – 3084 kHz
38. Dual polarization
39. 39.2 dB
40. 1.09
41. 275 ms
42. 0.5 s
43. 128
44. 5.4 MHz
45. 0.871 μW
46. 4 MHz
47. 4130 km
48. F2 layer
49. 47
50. 1.6 octaves
51. 3 times
52. 44.736
53. 358
54. Superrefraction
55. Temperature inversion
56. Duct
57. 1.35 cm and 1.7 mm
58. 5 mm and 2.5 mm
59. Ionosonde
60. 1100 km
61. 11.53 m/s
62. 343 m/s
63. 120 Hz
64. 320 kHz
65. D
66. Refraction
67. Using the smallest possible radiation angle and highest possible frequency
68. 32 km
69. 3853 Hz
70. NTT
71. 0.704 fF
72. Transponder
73. 35.3
74. Critical frequency
75. Frequency response
76. water vapor and oxygen
77. either elliptical or circular
78. Employment of highly directional spot-beam antennas
79. footprint
80. 440 Hz
81. 435
82. lower
83. 39.7 W
84. IS-95
85. 31.5 W
86. 10 Base T
87. 150 W
88. PD 576-A
89. 37.6 W
90. 13 kbps
91. 126 W
92. MC No. 2-05-88
93. 60 W
94. Hash
95. Twisted pair
96. EDGE
97. 12:00 Midnight to 5:00 AM
98. public-key encryption
99. 8 kbps
100. 7:8
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