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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-2

Each section contains 100 MCQs on Digital Communication .
81
The minimum step-size required for a Delta-Modulator operating at 32 k samples/sec to signal (here u(t) is the unit-step function) x(t) = 125t(u(t) - u(t - 1)) + (250 - 125t)(u(t - 1) - u(t - 2)) so that slope-overload is avoided, would be
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Answer & Solution
Answer: Option B
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82
Which of the following use syndrome decoding?
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Answer: Option A
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83
The advantage of differential PSK (DPSK) over coherent PSK is
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Answer: Option B
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84
In an ADM transmission system, the output signal amplitudes for 1's and 0's are
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Answer: Option D
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85
For the modulated carrier in a quadrature amplitude shift keying (QASK) digital system:
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Answer: Option C
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86
A PAM signal can be detected by using
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Answer: Option B
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87
How many bits are required to divide 10 V into 0.001 V intervals?
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Answer: Option A
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88
In a PCM system, if N is the number of levels and Z is the step size, then mean square quantization error is given by:
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Answer: Option B
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89
Consider the following:
1. Pulse-position modulation
2. Pulse-code modulation
3. Pulse-width modulation
Which of the above communications are not digital?
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Answer: Option C
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90
In a digital communication system employing Frequency Shift Keying (FSK), the 0 and 1 bit are represented by sine waves of 10 kHz and 25 kHz respectively. These waveforms will be orthogonal for a bit interval of
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Answer: Option B
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