Below are the answers key for the 100 items set of Practice Examination 13 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. b) Perigee
2. b) FM/TV Stereo
3. c) 1540 kHz
4. b) Refraction
5. b) Reflectometer
6. d) Increase its directivity
7. b) Major lobe radiation
8. b) Efficient use and equitable access.
9. a.) 205 Ω
10. a.) 405.050 MHz
11. b.) Can handle high power signal
12. b.) They process digital information
13. d.) A radio telegraph operator
14. d.) 6.312 Mb/s
15. b.) 90
16. b.) 4.75 MHz
17. d.) Antenna which can be used on more than one band due to the use of parallel LC networks.
18. b.) 20 Hz
19. b.) Sleeve
20. d.) 1.55 ft.
21. d.) Properties of the medium
22. b.) Intermodulation
23. a.) Injection laser diode
24. c.) DCS-1800
25. c.) Digital, analog
26. a.) A3F
27. c.) Bandwidth
28. c.) ITU-T
29. d.) 3-30 kHz
30. d.) A fixed point in an electromagnetic wave
31. c.) Stereo multiplex
32. b.) Direct to Home TV
33. b.) Noise margin
34. b.) Bits are transferred simultaneously
35. d.) 150 MHz
36. c.) 2000 Ω
37. d.) Effective boresight area
38. d.) Serial transmission
39. c.) Aperture antenna
40. d.) 600 ms.
41. c.) Grounded
42. b.) A higher refractive index than the cladding
43. d.) Provide loading coil
44. c.) Increase
45. d.) High power
46. d.) Riser terminal
47. c.) Blocked call
48. c.) Baseband signals
49. a.) Geocenter
50. c.) Yellow
51. c.) Corona discharge
52. c.) Modulation
53. c.) Loading coil
54. c.) C
55. d.) To minimize interference between signals at received end
56. c.) Very weak signals might not be received.
57. c.) Employment of highly directional spot-beam
58. c.) Frequency
59. c.) 4.5 MHz
60. d.) Executive Order 467
61. d.) Council
62. d.) Ratio of the total cross-sectional area to the total cross-sectional area of the fiber bundle
63. b.) 1085 kHz
64. b.) Regulated supply
65. b.) For receiving low and high band stations.
66. c.) Snow
67. d.) Troposphere
68. d.) National Telecommunications Communication
69. d.) Carrier Harmonics
70. b.) Photoresistive Layer
71. d.) 535-1605 kHz
72. d.) Building cable
73. c.) 1.48 MHz to 1.4995 MHz
74. b.) Call completion
75. c.) 24 satellites
76. c.) Antenna efficiency
77. c.) 458 THz
78. b.) Diameter of the core must be very much greater than the wavelength of the light to be carried.
79. d.) Mechanical filter
80. b.) Serial interference standard
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Complete List of Communications Engineering Exams: ECE Pre-Board
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