Below are the answers key for the 100 items set of Practice Examination 1 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. Cladding
2. helical
3. 7 and ½
4. 300
5. 1 mW
6. obtaining your fixes location over large distances
7. less amplification for low signal levels
8. obtaining fixes over large distances
9. -90 dBm
10. Code
11. 4/3
12. 83 B
13. effective isotropic radiated power
14. frequency-shift keying
15. RS-422A
16. aperiodic
17. 174 K
18. Diffraction
19. all of these
20. length
21. Generates a 1kHz note for Morse code reception
22. perigee
23. 45
24. gain of the antenna
25. the telephone network will pass direct current
26. isotropic antenna
27. 115.56 dBSPL
28. Communications satellite
29. pulse duration modulation
30. Two rectifiers in parallel with opposite polarities
31. 30 days
32. 1.086
33. independent sideband emission
34. space or direct
35. All of these are true
36. twice
37. Phase shift
38. 0.12 W
39. the clocking is derived from the data in synchronous transmission
40. D
41. 25
42. ½
43. indirect
44. 320 bps
45. agreed upon in advance between sender and receiver
46. -90 dBm
47. Hertz
48. PWM
49. To prevent amplified noise from reaching the loudspeaker during the absence of an incoming signal
50. A. bearing and distance indication
51. synchronous
52. infinite
53. To provide an acceptable replica of the information at the destination
54. The numeric ratio relating the radiated signal strength of an antenna to that of another antenna
55. the components are simpler, less costly, and more reliable
56. 2
57. 120 kHz
58. determined by the sender and receiver
59. 14 dB
60. 83%
61. 1.14 volts
62. Broadside array
63. improve the efficiency of data transfer
64. Yagi-uda
65. definite
66. 256 to 2048 Hz
67. balun
68. no
69. input
70. detector stage
71. 245 Hz
72. 132.29 Ω
73. a two-wire or four-wire communication circuit between the customer’s premise and central office
74. The equatorial regions
75. Quantizing
76. Beamwidth
77. Light emitting diode
78. Undergrounding
79. The interfering effect of other frequencies in a voice channel compared with a reference frequency of one kilohertz
80. Lies in the different definitions of the modulation index
81. unbalanced
82. 6 dB over the gain of one antenna
83. Residual noise level
84. band stop
85. 1000 lines
86. Ultraviolet absorption
87. Limiter
88. 2
89. 30 to 53 kHz
90. load connected to the output end of a transmission line
91. character oriented
92. ground
93. 0.66
94. 0 dB
95. 93
96. all of these
97. Log normal fading
98. local oscillator
99. Modem
100. No transmitter power is wasted in the carrier
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