Below are the answers key for the 100 items set of Practice Examination 12 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. c.) Impulse Noise
2. c.) The strong part.
3. d.) Desensitizing
4. d.) Advance Mobile Phone Services (AMPS)
5. c.) Ship Earth Station
6. b.) 190 mV/m
7. d.) 935-960 MHz; 890-915 MHz
8. d.) 9 kHz
9. b.) 4.5 MHz
10. c.) Double-Conversion
11. b.) Crosstalk
12. b.) By using push-pull amplifier
13. a.) FM
14. b.) Cross-modulation Interference
15. c.) To improve the receiver’s noise figure.
16. b.) ERP
17. d.) The antenna will be physically very large.
18. c.) Ribbon cable
19. d.) Integrity of data
20. b.) Allocates frequency bands for the services and determine the principle of distribution of orbit/spectrum resources
21. b.) Optical fiber
22. c.) Hub
23. c.) Bus
24. d.) Mesh
25. c.) Protocol analyzer
26. a.) Distress
27. d.) 40-75 GHz
28. a.) The numerical ratio relating the radiated signal strength of an antenna to that of another antenna.
29. d.) It may be used for multiband operations
30. c.) 0.25 wavelength
31. c.) N.S. Kapany
32. a.) It is about 5% longer.
33. a.) At the ends
34. d.) To tune out the capacitive resistance.
35. a.) A circuit for detecting FM signals
36. a.) The time required to complete one cycle.
37. a.) EO 467
38. a.) GMDSS
39. c.) Bridge
40. a.) TDM
41. c.) fIF
42. c.) Better Signal Penetration
43. b.) Secondary service area
44. a.) Non-resonant Type
45. c.) D
46. c.) 2 kHz
47. d.) Excite
48. a.) Vertical
49. a.) 3
50. d.) 500 MHz
51. a.) Infrared
52. c.) Fax modem
53. b.) DSB
54. a.) J3E
55. b.) F3E
56. b.) Spectrum Analyzer
57. d.) 140 dB
58. b.) Hand-off
59. b.) MTSO
60. c.) Rhombic
61. c.) P
62. d.) Spurious Signal
63. b.) Broadcasting
64. b.) Add an inductor in series
65. b.) ½ wavelength
66. b.) Node
67. d.) Dial-up
68. b.) Descending node
69. a.) C-Band
70. a.) Local area network
71. c.) Coaxial cable
72. c.) Free space medium
73. b.) Type of modulation of the main carrier
74. c.) Handshake
75. b.) Signal generator
76. c.) Gateway
77. a.) Frequency-division multiplexing
78. d.) Protocol
79. d.) Mobile earth station
80. b.) FM receiver is basically insensitive to amplitude modulation
81. b.) Holding memory
82. a.) The only way to produce an emission F3E signal is with a reactance modulator on the oscillator.
83. c.) Newtons per meter squared
84. c.) Congestion control
85. b.) Detector speed
86. b.) IMTS
87. c.) Nonsynchronous satellite
88. c.) Stereo multiplex
89. d.) High attenuation
90. d.) Cladding thickness is greater than the radius of the core and the diameter of the core must be much greater than the wavelength of the light to be carried.
91. b) WAN
92. c) Polling
93. d) To improve the receiver’s noise figure.
94. d) Use of less repeaters.
95. a) Interconnection
96. b) Λ/4
97. d) Cell to Mobile unit
98. b) Duplex Operation
99. d) First
100. c. A3C
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