Communication Systems MCQ Questions & Answers

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Learn Communication Systems 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. Communication Systems MCQ question is the important chapter for a Electronics and Communications Engineering(ECE) and GATE students. Page-5 section-1

Each section contains 100 MCQs on Communication Systems .

For telegraphy the most commonly used modulation system is

A) FSK B) Two tone modulation C) PCM D) Single tone modulation

Discuss

Answer & Solution

Answer: Option A

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

The main function of a balanced modulator is to

A) Produce balanced modulation of a carrier wave B) Produce 100% modulation C) Suppress carrier signal in order to create a single-sideband or double sideband D) Limit noise picked by a receiver

Discuss

Answer & Solution

Answer: Option B

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

In case of frequency modulation, modulating voltage remains constant if the modulating frequency is lowered, then

A) Amplitude of distant sidebands decreases B) Amplitude of distant sidebands increases C) Amplitude of distant sidebands remains constant D) Amplitude of distant sidebands first increases, then decreases

Discuss

Answer & Solution

Answer: Option B

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

Full duplex operation permits transmission in both directions at the same time.

A) True B) False

Discuss

Answer & Solution

Answer: Option A

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

The colour of an object is decided by

A) The reflected colour B) The wavelength transmitted through it C) Reflected colour for opaque object and wavelength transmitted through it for transparent objects D) None of the above

Discuss

Answer & Solution

Answer: Option C

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

Which of the following is a digital modulation technique?

A) PCM B) PSK C) DM D) All

Discuss

Answer & Solution

Answer: Option B

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

Assertion (A): In FM the frequency of the carrier is varied by the modulating voltage
Reason (R): FM and PM are two forms of angle modulation.

A) Both A and R are correct and R is correct explanation of A B) Both A and R are correct but R is not correct explanation of A C) A is correct but R is wrong D) A is wrong but R is correct

Discuss

Answer & Solution

Answer: Option B

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

PAM stands for

A) Pulse Analogue Modulation B) Phase Analogue Modulation C) Pulse Amplitude Modulation D) Phase Amplitude Modulation

Discuss

Answer & Solution

Answer: Option C

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

Which of the following does not cause losses in optical fibre cables?

A) Stepped index operation B) Impurities C) Microbending D) Attenuation in glass

Discuss

Answer & Solution

Answer: Option A

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

In a FM receiver, amplitude limiter

A) Amplifiers low frequency signals B) Reduces the amplitude of signals C) Eliminates any change in amplitude of received FM signals D) None of the above

Discuss

Answer & Solution

Answer: Option C

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

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Communication Systems MCQ Questions & Answers | ECE