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 41 of 120

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Q401.
24 telephone channels are frequency division multiplexed using an SSB modulation. Assuming 3 kHz per channel, the required band width is

a.

8 kHz

b.

27 kHz

c.

21 kHz

d.

72 kHz

Discuss
Answer: (d).72 kHz
Q402.
If velocity of sound waves in air at 0°C is 330 m/s, the velocity at 40°C is about

a.

330 m/s

b.

334 m/s

c.

353 m/s

d.

380 m/s

Discuss
Answer: (c).353 m/s
Q403.
A 5000 W signal is attenuated by - 196 dB. The resultant signal strength is

a.

1.26 x 10โถ W

b.

1.26 x 10โ€พ² W

c.

1.26 x 10โ€พโธ W

d.

1.26 x 10โ€พ¹โถ W

Discuss
Answer: (d).1.26 x 10โ€พ¹โถ W
Q404.
In FM, as bandwidth increases

a.

distortion increases

b.

distortion decreases

c.

distortion remains unaffected

d.

all

Discuss
Answer: (b).distortion decreases
Q405.
A 400 W carrier is amplitude modulated with m = 0.75. If single side band suppressed carrier is used the total power in modulated wave is

a.

400 W

b.

512 W

c.

112 W

d.

56 W

Discuss
Answer: (d).56 W
Q406.
In TV transmitter, the function of duplexer is

a.

to amplify video signal

b.

to remove distortions in audio signal

c.

to combine outputs of visual and audio transmitters

d.

to amplify audio signal

Discuss
Answer: (c).to combine outputs of visual and audio transmitters
Q407.
The PSD and the power of a signal g(t) are respectively Sg(ฯ‰) and Pg, the PSD and the power of signal a.g(t) are respectively

a.

aS²g (ฯ‰) and a²Pg

b.

aSg² (ฯ‰) and aPg

c.

aSg (ฯ‰) and a²Pg

d.

aSg (ฯ‰) and aPg

Discuss
Answer: (a).aS²g (ฯ‰) and a²Pg
Q408.
The simplest method of suppression of unwanted side band in AM is

a.

filter method

b.

phase shift method

c.

third method

d.

both (a) and (b)

Discuss
Answer: (a).filter method
Q409.
For attenuation of low frequencies we should use

a.

shunt capacitance

b.

series capacitance

c.

shunt inductance

d.

series inductance

Discuss
Answer: (b).series capacitance
Q410.
Assertion (A): A colour TV uses a SAW filter to give stable band pass response and high gain.

Reason (R): Devices using SAW principle are used in many systems.

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: (b).Both A and R are correct but R is not correct explanation of A
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