Below are the answers key for the 100 items set of Practice Examination 4 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. 8 to 1.43 GHz
2. Ultraviolet
3. Dipole
4. Type of modulation of the main carrier
5. Half-duplex operation
6. Emission
7. Type of information to be transmitted
8. Television
9. Omnidirectional
10. Chroma keying
11. 50 dB
12. Telemetry
13. 1 dB
14. All of these
15. Isotropic
16. PAM
17. Ionospheric scatter
18. All of these
19. Pitch
20. Stereo multiplexing
21. Out of the band
22. Circular polarization
23. Impulse noise
24. Reflectometer
25. Reduce carrier single sideband emission
26. Land station
27. Vertical polarization
28. Telstar 1
29. T1
30. 768 kbps
31. APDs
32. 4.78 µV
33. 1.28 x 10-19 J
34. 34.61 ns
35. 4 KHz
36. Space diversity
37. Noise improvement factor
38. Huygen’s Principle
39. Continuous modulation
40. 30 MHz
41. F1 layer
42. Bidirectional
43. 28.17 dB
44. Linearly
45. Optical attenuator
46. TE
47. Necessary bandwidth
48. Smith chart
49. 8.2345 MHz
50. Horizontal polarization
51. Telecommand
52. ERP
53. 14/11 GHz
54. ASK
55. Beamwidth
56. NPR
57. Administration
58. Woofer
59. Below 2 GHz
60. 511
61. 8.8 dB
62. Satellite disk
63. Interference to adjacent channel
64. Carrier power
65. Volume
66. E.O. 109
67. Mobile service
68. More
69. Aeronautical fixed service
70. Low pass filter
71. Diffraction
72. Geosynchronous
73. Noise equivalent power
74. Major lobe radiation
75. 300 - 3400 Hz
76. 5925 MHz
77. Input and output
78. dP/dA
79. Fundamental
80. Parasitic elements
81. A higher index of refraction than the cladding
82. Adding C in series
83. 66.66 W
84. Pulsed modulation
85. Troposcatter
86. Spot beam
87. 1.76 dB
88. Satellite network
89. Quantizing noise
90. Stack
91. Coast station
92. Pulse modulation
93. A
94. Rayleigh scattering loss
95. No answer
96. Analogue cellular
97. Effective boresight area
98. 20 kHz
99. TVRO
100. Flare
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