Digital Modulation Techniques Quiz | 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

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

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

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

Answer: Sampling, quantizing, encoding
85 QAM uses ______ as the dimensions.
A In phase & Quadrature
B Quadrature
C In phase
D None of the mentioned

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

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

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

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

Answer: Continuous FSK
90 FSK reception is
A Phase Coherent & non coherent
B Phase non coherent
C Phase Coherent
D None of the mentioned

Answer: Phase Coherent & non coherent
91 Every frequency has ____ orthogonal functions.
A One
B Two
C Four
D Six

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

Answer: All of the above
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