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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-4 section-2

Each section contains 100 MCQs on Digital Communication .
31
From the following relative amplitude vs frequency plot, identify the type of noise which the sections A, B, C and D depict.
Digital Communication mcq question image
List-I List-II
a. Section A 1. Thermal noise
b. Section B 2. Power line pick up
c. Section C 3. Power supply (EPC) switching noise
d. Section D 4. $$\frac{1}{{\text{f}}}$$ noise
Discuss
Answer & Solution
Answer: Option C
No explanation is given for this question. Let's Discuss on Board
32
For an ideal 3000 Hz channel, nyquist rate is
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Answer & Solution
Answer: Option B
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33
Which of the following is not the modulation technique
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Answer & Solution
Answer: Option A
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34
The information rate to be transmitted is 900 bits/sec, FEC is $$\frac{3}{4}$$, the symbol rate for QPSK modulation scheme is:
Discuss
Answer & Solution
Answer: Option C
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35
Flat top sampling of low pass signals
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Answer & Solution
Answer: Option A
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36
In a binary PCM system, the maximum tolerable error is sample amplitudes is 0.5% of the peak input signal amplitude. The input signal bandwidth is 5 MHz. The minimum rate of transmission of the PCM coded bits is:
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Answer & Solution
Answer: Option B
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37
The bit rate of a digital communication system is 34 Mbit/s. The modulation scheme is QPSK. The baud rate of the system is
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Answer & Solution
Answer: Option C
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38
What is the process of utilizing one data link for transmission of a group of variable known as?
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Answer & Solution
Answer: Option D
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39
In a single error correcting Hamming code, the number of message bits in a block is 26. The number of check bits in the block would be
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Answer & Solution
Answer: Option C
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40
A satellite system employs QPSK modulation with 40% excess bandwidth per carrier including guard band. The voice channels use 64 kbps PCM coding. The number of channels supported by 36 MHz bandwidth of the transponder in bandwidth limited case will be
Discuss
Answer & Solution
Answer: Option B
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