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-6 section-2

Each section contains 100 MCQs on Digital Communication .

To reduce the distortion, which one of the following can be used?

A) Equalizer B) Sampler C) Multiplexer D) Companders

Discuss

Answer & Solution

Answer: Option A

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

Consider minimum shift keying (MSK) also known as fast with frequency spacing 2f_d between the state frequencies. r_b is the data rate. Which one of the following correctly relates r_b and f_d?

A) $${f_d} = \frac{{{r_b}}}{4}$$ B) $${f_d} = \frac{{{r_b}}}{2}$$ C) $${f_d} = \frac{{3{r_b}}}{4}$$ D) $${f_d} = {r_b}$$

Discuss

Answer & Solution

Answer: Option A

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

In delta modulation, the quantizer is a

A) 2-bit quantizer B) 4-bit quantizer C) 1-bit quantizer D) None of these

Discuss

Answer & Solution

Answer: Option C

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

. . . . . . . . step is NOT involved in pulse code modulation system.

A) Encoding B) Generating C) Sampling D) Quantising

Discuss

Answer & Solution

Answer: Option B

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

Figure shows a block diagram of a system to recover a sampled signal shown as input.
Blocks A and B can be respectively
Digital Communication mcq question image

Digital Communication mcq question image

A) Zero order hold and low pass filter B) Multiplier and high pass filter C) Envelop detector and sampler D) Tuned circuit and mixer

Discuss

Answer & Solution

Answer: Option A

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

Roll - off factor is defined as

A) The bandwidth occupied beyond the Nyquist Bandwidth of the filter B) The performance of the filter or device C) Aliasing effect D) None of the above

Discuss

Answer & Solution

Answer: Option A

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

A ramp signal m(t) = at is applied to a delta modulator with sampling period T_S and step size d. Slope overload distortion would occur if

A) d < a B) d > a C) d < aT_S D) d > aT_S

Discuss

Answer & Solution

Answer: Option C

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

At a given probability of error, binary coherent FSK is inferior to binary coherent PSK by

A) 6 dB B) 3 dB C) 2 dB D) 0 dB

Discuss

Answer & Solution

Answer: Option B

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

A continuous signal has voltage range of -4 V to +2 V. If this is quantized to 8 bits, then the step size of the quantizer will be:

A) $$\frac{3}{{128}}$$ B) $$\frac{1}{{256}}$$ C) $$\frac{1}{{64}}$$ D) $$\frac{1}{{128}}$$

Discuss

Answer & Solution

Answer: Option A

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

Four voice signals, each limited to 4 kHz and sampled at Nyquist rate, are converted into binary PCM signal using 256 quantization levels. The bit transmission rate for the timedivision multiplexed signal will be

A) 8 kbps B) 64 kbps C) 256 kbps D) 512 kbps

Discuss

Answer & Solution

Answer: Option C

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

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Digital Communication MCQ Questions & Answers | ECE