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 69 of 120

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Q681.
The percentage saving in power when the carrier and one of the sidebands are suppressed in an AM wave modulated to a depth of 100% will be nearly

a.

50%

b.

66%

c.

75%

d.

83%

Discuss
Answer: (d).83%
Q682.
The difference between phase and frequency modulation

a.

is purely of academic interest

b.

lies in the different definitions of the modulation index

c.

lies in the poor audio response of phase modulation

d.

is too great to make the two systems compatible

Discuss
Answer: (b).lies in the different definitions of the modulation index
Q683.
A signal m(t) amplitude modulates a carrier Ac cos ฯ‰ct. The final signal will be

a.

[Ac m(t)] cos ฯ‰ct]

b.

Ac . [1 + m(t)] cos ฯ‰ct

c.

Ac + [m(t)] cos ฯ‰ct

d.

Ac cos ฯ‰ct + m(t)

Discuss
Answer: (b).Ac . [1 + m(t)] cos ฯ‰ct
Q684.
An oscillator at 4.2 MHz is followed by two frequency doublers and two triplers. The output frequency will be

a.

84 MHz

b.

112.4 MHz

c.

151.2 MHz

d.

303.4 MHz

Discuss
Answer: (c).151.2 MHz
Q685.
Over which frequency range the effect of atmospheric noise is significant?

a.

Over 35 MHz

b.

Below 30 MHz

c.

Between 30 MHz and 100 MHz

d.

Between 100 MHz and 150 MHz

Discuss
Answer: (d).Between 100 MHz and 150 MHz
Q686.
In an AM system, doubling of modulation index doubles the antenna current. The system is

a.

single side band full carrier

b.

vestigial side band

c.

single side band suppressed carrier

d.

double side band full carrier

Discuss
Answer: (c).single side band suppressed carrier
Q687.
A frequency multiplier stage should operate as

a.

class A

b.

class AB

c.

class C

d.

either of the above

Discuss
Answer: (c).class C
Q688.
UHF range is

a.

30 MHz to 300 MHz

b.

300 MHz to 3000 MHz

c.

3000 MHz to 30, 000 MHz

d.

above 30, 000 MHz

Discuss
Answer: (b).300 MHz to 3000 MHz
Q689.
A carrier signal at frequency 100 MHz is frequency modulated with modulation index 2 by a signal at 2 kHz. At what frequencies are the sidebands produced?

a.

102 MHz and 98 Mhz

b.

100 MHz + 2 kHz, 100 MHz - 2 kHz

c.

100 MHz ± ฮ”fd where fd is frequency deviation

d.

100 MHz ± 3n kHz, where n is 1, 2, ... S integer

Discuss
Answer: (d).100 MHz ± 3n kHz, where n is 1, 2, ... S integer
Q690.
Which is not purpose of modulation?

a.

Effective radiation

b.

Multiplexing

c.

Narrow band

d.

Increase in signal power

Discuss
Answer: (d).Increase in signal power
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