Communications Engineering Exam 1: ECE Pre-Board - Answers

Answers key for the Pre-Board Examinations in Communications Engineering Module 1 composed of previous Board Exams Questions.

Communications Engineering Exam 1 - Answers

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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Complete List of Communications Engineering Exams: ECE Pre-Board


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