Below are the answers key for the 100 items set of Practice Examination 5 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. Two or more antennas operating on the same frequency
2. Antenna gain
3. Base station
4. High power
5. X
6. C
7. Saturation
8. Center of the antenna
9. By installing a good ground radial system
10. Around 500 miles
11. Efficiency = radiation resistance/total resistance x 100%
12. Aural broadcast STL
13. Snell’s
14. 156.8 MHz
15. Gateway
16. Telecommand
17. A variable LC oscillator with metered feedback current
18. A3E and F3C
19. In terms of peak envelop power
20. 0 degrees latitude
21. loading coil
22. The frequency range over which and antenna can be expected to perform well
23. TDMA
24. A fading effect caused by phase differences between radio wave components of the same transmission, as experienced at the receiving station.
25. At feed point
26. Whip
27. Carrier power
28. Sunspots
29. A3E
30. Franchise
31. 200 kHz
32. FM
33. A non-radiating load for a transmitter used for testing
34. Bidirectional
35. Global beam
36. Gaussian minimum shift keying
37. Laser
38. Communication
39. Velocity factor
40. Circulator
41. Slope overload
42. Space station
43. 0.31250 GHz
44. Transmission system engineering
45. LAN
46. Land station
47. The combination of two signals to produce sum and difference frequencies.
48. Amplitude modulation
49. Thermal agitation
50. Horizontal aiming of the antenna
51. The time required to complete one cycle
52. Throughput
53. 42.5%
54. Stack
55. The element fed by the transmission line
56. Peak limiting
57. Radiation
58. Drift
59. 10100
60. 4:1
61. Frequency
62. V.1
63. Reduced carrier single sideband emission
64. Phonoscope
65. 50 kW
66. 110011
67. Iridium system
68. Modulator
69. Down link
70. Violet
71. Resonant
72. Broadcast
73. Maximum voltage and minimum current.
74. Synchronous optical network
75. Through installing a band-pass filter in the antenna feed line
76. Tropospheric ducting
77. Longer it can reach
78. 40 dB
79. The electric field is parallel to the earth
80. Television
81. Decrease the receiver squelch, gain.
82. Optical repeater
83. Low noise amplifier
84. Facsimile
85. Crossfire
86. In the receiver front end
87. Synchronous data transfer scheme
88. Vestigial sideband
89. 8.36 kW
90. Class C
91. E.O. 109
92. Mixer
93. 20 Hz
94. A wave consisting of an electric field and a magnetic field at right angles to each other.
95. 3.4 to 6.424 GHz
96. Packet mode
97. Yagi antenna
98. A circuit for detecting FM signals
99. Terminal adapters
100. Department of transportation and communications
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