Digital Communications Questions and Answers – Sampling and Quantization – 1

This set of Digital Communications Multiple Choice Questions & Answers (MCQs) focuses on “Sampling and quantization”.

1. Which signals are function of time?
a) Random signal
b) Deterministic signal
c) Random & Deterministic signal
d) None of the mentioned
View Answer

Answer: b
Explanation: Deterministic signals are function of time.

2. Auto-correlation function is a
a) Even function
b) Odd function
c) Even & Odd function
d) None of the mentioned
View Answer

Answer: a
Explanation: Auto-correlation function is an even function of time.

3. Shot noise occurs in
a) Transistors
b) Valves
c) Transistors & Valves
d) None of the mentioned
View Answer

Answer: c
Explanation: Shot noise occurs in both valves and transistors.
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4. Source coding reduces
a) Redundancy
b) Average bit rate
c) Redundancy & Average bit rate
d) None of the mentioned
View Answer

Answer: c
Explanation: Source coding reduces both average bit rate and reduces redundancy.

5. Delay element in delta modulation acts as
a) First order predictor
b) Second order predictor
c) Third order predictor
d) Fourth order predictor
View Answer

Answer: a
Explanation: Delay element act as first order predictor.
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6. Non uniform quantization includes
a) Compression
b) Expansion
c) Compression & Expansion
d) None of the mentioned
View Answer

Answer: c
Explanation: Compression and expansion give the feature of non uniform quantization.

7. The quantization will be finer when
a) Smaller the number of discrete amplitudes
b) Larger the number of discrete amplitudes
c) Does not depend on amplitudes
d) None of the mentioned
View Answer

Answer: b
Explanation: Larger the number of discrete amplitudes, finer will be the quantization.
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8. Different cases of sampling include
a) Ideal impulse sampling
b) Flat-topped sampling
c) Sampling with rectangular pulses
d) All of the mentioned
View Answer

Answer: d
Explanation: The three cases of sampling are ideal impulse sampling, sampling with rectangular pulses and flat topped sampling.

9. Transmitted pulse becomes distorted due to
a) Ideal transmission characteristic
b) Non ideal transmission characteristic
c) All of the mentioned
d) None of the mentioned
View Answer

Answer: b
Explanation: A transmitted pulse gradually becomes distorted due to non ideal transmission characteristic of the channel.
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10. In which mixing is easier?
a) Analog signal
b) Digital signal
c) Analog & Digital signal
d) None of the mentioned
View Answer

Answer: b
Explanation: Mixing of digital signals are easier than that of mixing analog signals.

Sanfoundry Global Education & Learning Series – Digital Communications.

To practice all areas of Digital Communications, here is complete set of 1000+ Multiple Choice Questions and Answers.

If you find a mistake in question / option / answer, kindly take a screenshot and email to [email protected]

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Manish Bhojasia - Founder & CTO at Sanfoundry
Manish Bhojasia, a technology veteran with 20+ years @ Cisco & Wipro, is Founder and CTO at Sanfoundry. He lives in Bangalore, and focuses on development of Linux Kernel, SAN Technologies, Advanced C, Data Structures & Alogrithms. Stay connected with him at LinkedIn.

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