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Digital Communication MCQ Questions & Answers | ECE

Learn Digital Communication MCQ questions & answers are available for a Electronics and Communications Engineering(ECE) students to clear GATE exams, various technical interview, competitive examination, and another entrance exam. Digital Communication MCQ question is the important chapter for a Electronics and Communications Engineering(ECE) and GATE students. Page-9 section-1

Each section contains 100 MCQs on Digital Communication .
81
In high speed TDM, the channels are separated in the receiver employing
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Answer & Solution
Answer: Option D
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82
Delta modulation and pulse code modulation have a threshold Pe, (Considering the impact of errors in various digits).
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Answer: Option D
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83
The bit rate of digital communication system is R kbits/s. The modulation used is 32-QAM. The minimum bandwidth required for ISI free transmission is
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Answer: Option D
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84
Five channels each with 100 kHz bandwidth are to be multiplexed together. What is the minimum bandwidth of the link, if three is a need of a guard band is a need of a guard band of 10 kHz between the channels to prevent interference?
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Answer: Option B
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85
Minimum Bandwidth required for Minimum Shift Keying (MSK)? Where fb is maximum frequency of baseband signal.
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Answer: Option B
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86
The criterion used for pulse shaping to avoid ISI is
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Answer: Option A
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87
Which signaling scheme is most affected by noise?
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Answer: Option A
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88
The received signal level for a particular digital system is -151 dBW and the effective noise temperature of the receiver system is 1500 K. The value of $$\frac{{{{\text{E}}_{\text{b}}}}}{{{{\text{N}}_0}}}$$ required for a link transmitting 2400 bps is:
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Answer: Option D
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89
PAM signals are constructed by using a low pass filter of pass band slightly greater than base band to avoid aliasing. This avoids distortion
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Answer: Option D
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90
The raised cosine pulse p(t) is used for zero ISI in digital communications. The expression for p(t) with unity roll-off factor is given by $$p\left( t \right) = \frac{{\sin 4\pi Wt}}{{4\pi Wt\left( {1 - 16{W^2}{t^2}} \right)}}.$$      The value of p(t) at $$t = \frac{1}{{4W}}$$  is
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Answer: Option C
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