Digital Modulation Techniques MCQs and Answers for competitive exams

Questions

81 The process of converting the analog sample into discrete form is called

A Quantization

B Sampling

C Multiplexing

D Modulation

View Answer

Answer: Quantization

82 The characteristics of compressor in μ-law companding are

A Continuous in nature

B Logarithmic in nature

C Linear in nature

D Discrete in nature

View Answer

Answer: Continuous in nature

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83 The modulation techniques used to convert analog signal into digital signal are

A Pulse code modulation

B Adaptive delta modulation

C Delta modulation

D All of the above

View Answer

Answer: All of the above

84 The sequence of operations in which PCM is done is

A Sampling, quantizing, encoding

B Quantizing, encoding, sampling

C Quantizing, sampling, encoding

D None of the above

View Answer

Answer: Sampling, quantizing, encoding

85 QAM uses ______ as the dimensions.

A In phase & Quadrature

B Quadrature

C In phase

D None of the mentioned

View Answer

Answer: In phase & Quadrature

86 Which has same probability of error?

A BPSK and QPSK

B BPSK and ASK

C BPSK and PAM

D BPSK and QAM

View Answer

Answer: BPSK and PAM

87 Which system uses QAM?

A Dial up modem

B Digital microwave relay

C Peak value/ rms value

D None of the mentioned

View Answer

Answer: Digital microwave relay & Dial up modem

88 Average energy per bit is given by

A average energy symbol/log2 M

B log2 M/ Average energy symbol

C average energy symbol * log2 M

D none of the mentioned

View Answer

Answer: average energy symbol/log2 M

89 Which FSK has no phase discontinuity?

A Uniform FSK

B Discrete FSK

C Continuous FSK

D None of the mentioned

View Answer

Answer: Continuous FSK

90 FSK reception is

A Phase Coherent & non coherent

B Phase non coherent

C Phase Coherent

D None of the mentioned

View Answer

Answer: Phase Coherent & non coherent

91 Every frequency has ____ orthogonal functions.

A One

B Two

C Four

D Six

View Answer

Answer: Two

92 Equalization in digital communication

A Is done using linear filters

B Removes distortion caused due to channel

C Reduces inter symbol interference

D All of the above

View Answer

Answer: All of the above

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