Digital Communication MCQ Questions & Answers

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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-3 section-2

Each section contains 100 MCQs on Digital Communication .

A signal m₁(t) is band limited to 3.6 kHz and the three other signals m₂(t), m₃(t) and m₄(t) are band limited to 1.2 kHz each, and these signals are transmitted by means of TDM. Then, what will be the transmission bandwidth of the channel.

A) 7.2 kHz B) 14.4 kHz C) 3.6 kHz D) 2.4 kHz

Discuss

Answer & Solution

Answer: Option A

No explanation is given for this question. Let's Discuss on Board

The bit rate of a digital communication system is 16 Mbps. The modulation scheme is QPSK. The baud rate of the system is:

A) 16 Mbps B) 32 Mbps C) 48 Mbps D) 64 Mbps

Discuss

Answer & Solution

Answer: Option B

No explanation is given for this question. Let's Discuss on Board

Which one of the following can be used for the detection of the non coherent BFSK signal?

A) Matched filter B) Phase-locked loop C) Envelope detector D) Product demodulator

Discuss

Answer & Solution

Answer: Option B

No explanation is given for this question. Let's Discuss on Board

The anti-aliasing filter has a higher cut-off frequency f_m. Its output is sampled periodically every T_s seconds. For proper recovery of the signal at the receiver, T_s must be

A) $${T_s} \geqslant \frac{1}{{2{f_m}}}$$ B) $${T_s} \leqslant \frac{1}{{2{f_m}}}$$ C) $${T_s} \geqslant \frac{2}{{{f_m}}}$$ D) $${T_s} \leqslant \frac{2}{{{f_m}}}$$

Discuss

Answer & Solution

Answer: Option B

No explanation is given for this question. Let's Discuss on Board

For QPSK

A) Error rate is lower than 16 MPSK B) Error rate is higher than QASK C) Signals are in time Quadrature D) More-inter symbols interference compared to MSK

Discuss

Answer & Solution

Answer: Option D

No explanation is given for this question. Let's Discuss on Board

In 512 QAM, the number of signal vectors of the signal constellation is:

A) 820 B) 144 C) 512 D) 128

Discuss

Answer & Solution

Answer: Option C

No explanation is given for this question. Let's Discuss on Board

In a certain '12 channel TDM' system, it is found that channel number 3 and channel number 8 are connected to the same input signal. The technique

A) wastes the channel capacity B) takes care of different sampling rates C) is required when different bandwidth signals are to be transmitted D) reduces noise

Discuss

Answer & Solution

Answer: Option B

No explanation is given for this question. Let's Discuss on Board

The spectral efficiency and bandwidth of BPSK are . . . . . . . . and . . . . . . . . respectively.

A) 0.5 b/s/Hz, 2f_b B) 1 b/s/Hz, f_b C) 2 b/s/Hz, f_b D) 1 b/s/Hz, 2f_b

Discuss

Answer & Solution

Answer: Option A

No explanation is given for this question. Let's Discuss on Board

The bit rate of digital communication system is M kbps. The modulation used is 16-QAM. The minimum bandwidth required for ideal transmission is . . . . . . . .

A) M/2 kHz B) M/16 kHz C) M kHz D) M/8 kHz

Discuss

Answer & Solution

Answer: Option D

No explanation is given for this question. Let's Discuss on Board

Hamming codes are used for error detection and correction. If the minimum Hamming distance is m, then the number of errors correctable is

A) equal to m B) less than $$\frac{{\text{m}}}{2}$$ C) equal to 2 m D) greater than m

Discuss

Answer & Solution

Answer: Option B

No explanation is given for this question. Let's Discuss on Board

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Digital Communication MCQ Questions & Answers | ECE