Below are the answers key for the 100 items set of Practice Examination 2 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. MF
2. DTE
3. Data terminal equipment (DTE)
4. the approximation of the quantized signal
5. convert current variations into sound waves
6. inverted
7. attenuation
8. Standing waves
9. noise is amplified with voice when an FDM system is used
10. Modulation index
11. Shorten the time delay for each channel
12. polling
13. 6
14. LSB and USB
15. standards for interfaces between terminals and modems
16. Tie trunk
17. 312 to 552 kHz
18. 64 kbps
19. Reflectometer
20. 270 kbps
21. 2.6
22. PAM
23. 2.656 watts
24. Satellite dish
25. 128
26. 20 kW
27. 240 Hz
28. is decreased
29. repeaters regenerate digital pulses and remove distortion
30. bridge
31. Angle
32. mode
33. Polling
34. ICAO
35. Bipolar
36. flattening
37. both electric and magnetic fields
38. 2:1
39. Downlink
40. TDM
41. dBr
42. 1.3 MHz
43. 1.23
44. PSK
45. RF carrier
46. 1
47. All of these
48. 1952
49. the positioning of data within a frame
50. 10 Mbps
51. 92.4 + 20 log f + 20 log d
52. Rhombic antenna
53. Early bird
54. 4
55. Bockham and Kao
56. C-band
57. Frequency
58. Polarization
59. Band reject filter
60. has 132 characters including 32 control characters
61. low-wattage light bulb
62. resistive load at the resonant frequency
63. 140.89 dB
64. 40 dBm
65. ion propulsion system
66. IMPATT
67. transfer maximum power to the load
68. 300,000 km/sec
69. are reflected from the walls but do not travel along them
70. agreed upon in advance between sender and receiver
71. Discrete channel
72. Molten
73. dolby
74. The clocking is derived from the data in synchronous
75. 22
76. A3
77. Sound intensity
78. effective height
79. Induction coil
80. Moon
81. interface digital terminal equipment to analog communications channel
82. 3700 Hz
83. H3E
84. 0 to 4 kHz
85. 10-6m
86. Surface loam soil
87. UHF
88. Mel
89. Electromagnetic
90. 64 kbps
91. horizontally polarized
92. 0.0465 cm
93. 14 ns
94. 52 µsec
95. 3 dB
96. 35
97. two or more antennas operating on the same frequencies
98. Isochronous
99. SIM
100. Radio survey
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