Introduction To Satellite Communication – 2 – 5

71. Companding is used :

(a) To protect small signals in PCM from quantizing distortion
(b) To overcome quantize noise in PCM
(c) To overcome impulse noise
(d) None of these

ANSWER

EXPLANATION

72. FM discriminator changes the FM signal into :

(a) AM signal
(b) FM signal
(c) PM signal
(d) None of these

ANSWER

EXPLANATION

73. Which of the following system is digital :

(a) Pulse Position Modulation
(b) Pulse Code Modulation
(c) Pulse Width Modulation
(d) Pulse Frequency Modulation

ANSWER

EXPLANATION

74. In communication system, sampling technique leads to :

(a) Cheaper equipment
(b) Better efficiency
(c) Higher speed of communication
(d) Simpler operation

ANSWER

EXPLANATION

75. Frequency Shift Keying is basically a method involving :

(a) Amplitude Modulation
(b) Frequency Modulation
(c) Phase Modulation
(d) None of these

ANSWER

EXPLANATION

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