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Introduction To Satellite Communication – 2 – 6

76. Pulse Width Modulation may be generated :

(a) By differentiating Pulse Position Modulation
(b) With a Mono Stable Multivibrator
(c) By Integrating the signal
(d) With a Free Running Multivibrator

ANSWER

EXPLANATION

77. Which of the following Pulse Modulation System is analog :

(a) Delta
(b) PCM
(c) Differential PCM
(d) PWM

ANSWER

EXPLANATION

78. Frequency Shift Keying is commonly used in :

(a) Radio Transmission
(b) Telegraphy
(c) Telephony
(d) None of these

ANSWER

EXPLANATION

79. A carrier is amplitude modulated by two sine waves of different frequencies upto 40% and 60%. The resulting overall modulation index is :

(a) 1
(b) 0.72
(c) 0.4
(d) 0.6

ANSWER

EXPLANATION

80. Indicate the fields statement regarding the advantages of SSB over double side band, full carrier AM :

(a) more channel space is available
(b) the signal is more noise resistant
(c) transmitter circuit must be more stable, giving better reception
(d) much less power is required for the same signal strength

ANSWER

EXPLANATION

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