Communication Systems MCQs

Welcome to our comprehensive collection of Multiple Choice Questions (MCQs) on Communication Systems, a fundamental topic in the field of Electronics and Communication Engineering. Whether you're preparing for competitive exams, honing your problem-solving skills, or simply looking to enhance your abilities in this field, our Communication Systems MCQs are designed to help you grasp the core concepts and excel in solving problems.

In this section, you'll find a wide range of Communication Systems mcq questions that explore various aspects of Communication Systems problems. Each MCQ is crafted to challenge your understanding of Communication Systems principles, enabling you to refine your problem-solving techniques. Whether you're a student aiming to ace Electronics and Communication Engineering tests, a job seeker preparing for interviews, or someone simply interested in sharpening their skills, our Communication Systems MCQs are your pathway to success in mastering this essential Electronics and Communication Engineering topic.

Note: Each of the following question comes with multiple answer choices. Select the most appropriate option and test your understanding of Communication Systems. You can click on an option to test your knowledge before viewing the solution for a MCQ. Happy learning!

So, are you ready to put your Communication Systems knowledge to the test? Let's get started with our carefully curated MCQs!

Communication Systems MCQs | Page 3 of 120

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Q21.
A single tone modulating signal Vm cos ωt modulates a carrier A cos ωct. The carrier power (modulated) and side band powers are respectively

a.

A

b.

B

c.

C

d.

D

Discuss
Answer: (a).A
Q22.
Modulation index of a AM wave is measured using oscilloscope. The display on the CRO is as shown in figure it can be concluded that

a.

the output wave is distorted

b.

the output wave is under modulated

c.

the modulation index is 100%

d.

the modulation index is 50%

Discuss
Answer: (a).the output wave is distorted
Q23.
If f is frequency and d is distance, path attenuation a between isotropic antennas is given by

a.

A

b.

B

c.

C

d.

D

Discuss
Answer: (a).A
Q24.
If the transmitted pulse power of a radar is Pt (peak value) and the antenna is isotropic, the power density at a distance r is

a.

A

b.

B

c.

C

d.

D

Discuss
Answer: (b).B
Q25.
In delta modulation, the output signal to quantization noise ratio S0/Nq is (N is the number of bits)

a.

A

b.

B

c.

C

d.

D

Discuss
Answer: (b).B
Q26.
If B is channel bandwidth, S is signal power and N is the total noise within the channel bandwidth, the channel capacity C of a white band limited gaussian channel is

a.

A

b.

B

c.

C

d.

D

Discuss
Answer: (a).A
Q27.
For an RC low pass filter, the relation between noise bandwidth BN and 3-dB bandwidth B3dB is

a.

A

b.

B

c.

C

d.

D

Discuss
Answer: (a).A
Q28.
The block diagram of AM transmitter in which high level modulation is used as shown in figure. The block X could be

a.

audio power amplifier

b.

buffer RF amplifier

c.

compressor amplifier

d.

none of the above

Discuss
Answer: (b).buffer RF amplifier
Q29.
When E1, E2, E3 etc. are the simultaneous modulating voltages, then the total modulating voltage Et will be

a.

A

b.

B

c.

C

d.

D

Discuss
Answer: (c).C
Q30.
The constellation diagram of a modem has four states as shown in the figure given below. What is the bit rate of this modem?

a.

Two times its band rate

b.

Four times its band rate

c.

Same as band rate

d.

Sufficient information is not given to give the answer

Discuss
Answer: (a).Two times its band rate
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