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-7 section-1

Each section contains 100 MCQs on Communication Systems .

A communication receiver has an intermediate frequency of 9 MHz. What is the frequency of its oscillator when it is tuned to 15 MHz?

A) 24 MHz B) 12 MHz C) 9 MHz D) 15 MHz

Discuss

Answer & Solution

Answer: Option A

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

Which one of the statements regarding the following signal x(t) = 5sin(2π × 10³t)sin(2π × 10⁶t) is incorrect?

A) The upper sideband frequency is 1001000 B) The lower sideband frequency is 999000 C) The carrier amplitude is 5 D) x(t) is a DSB-SC signal

Discuss

Answer & Solution

Answer: Option D

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

The narrow band FM signal is 10cos(2π1000t + 0.2sin(2π100t)) what is instantaneous frequency:

A) 1000 + 20cos(2π100t) B) 2000 + 10cos(2π100t) C) 1000 +10sin(2π100t) D) 2cos(2π100t)

Discuss

Answer & Solution

Answer: Option A

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

Match List-I with List-II and select the correct answer using the options given below:

List-I	List-II
a. Resistance	1. Current Noise
b. Diode	2. Partition Noise
c. Triode	3. Shot Noise
d. p-n junction Noise	4. Atmospheric
	5. Johnson Noise

A) a-1, b-3, c-4, d-5 B) a-5, b-3, c-2, d-1 C) a-5, b-3, c-2, d-4 D) a-1, b-5, c-3, d-2

Discuss

Answer & Solution

Answer: Option B

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

The advantages of DSB over SSB full carrier AM is

A) Less available channel space B) More stable transmitter gives C) More power to transmit same signal D) Signal is less resistant to noise

Discuss

Answer & Solution

Answer: Option C

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

Modems are used for data transmission telephone lines to

A) Increase the transmission capacity B) Improve noise performance C) Incorporate error control coding D) Eliminate dc component in the transmitted signal

Discuss

Answer & Solution

Answer: Option A

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

Super heterodyne radio receiver suffers from-

A) carrier frequency problem B) intermediate amplitude problem C) Gain control problem D) image frequency problem

Discuss

Answer & Solution

Answer: Option D

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

In the FM wave described by equation v = 15sin(4 × 10⁸t + 3sin1100t), the maximum frequency deviation is

A) 175 Hz B) 525 Hz C) 58.33 Hz D) 3 Hz

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Answer & Solution

Answer: Option B

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Probability density function of random variable x is:

A) $$\int\limits_{ - \infty }^\infty {{f_x}\left( x \right)dx = 1} $$ B) $$\frac{{d{f_x}}}{{dx}}\left( x \right) = {F_x}\left( x \right)$$ C) $$0 \leqslant \int_x^{} {\left( x \right) \leqslant 1} $$ D) $$\int_x^{} {\left( x \right) = \int\limits_{ - \infty }^\infty {{F_x}\left( x \right)dx} } $$

Discuss

Answer & Solution

Answer: Option A

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The auto-correlation function of a band limited (B) white noise process is given by

A) R(τ) = B × N₀ ℓn(2Bτ) B) R(τ) = B × N₀ × τ × sin(2B) C) R(τ) = B × N₀ log(2Bτ) D) R(τ) = B × N₀ sin c(2Bτ)

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Answer & Solution

Answer: Option D

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Communication Systems MCQ Questions & Answers | ECE