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 96 of 120

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Q951.
Which of the following antennas is not wide band?

a.

Marconi

b.

Helical

c.

Folded dipole

d.

Discone

Discuss
Answer: (a).Marconi
Q952.
In phase shift keying the input signal is

a.

st(t) = A cos ฯ‰0t and s2(t) = - A cos ฯ‰0t

b.

s1(t) = s2(t) = A cos ฯ‰0t

c.

s1(t) = A cos ฯ‰0t and s2(t) = A cos (ฯ‰0t + ฯ€/2)

d.

s1(t) = A cos ฯ‰0t and s2(t) = - A (cos ฯ‰0t + ฯ€/2)

Discuss
Answer: (a).st(t) = A cos ฯ‰0t and s2(t) = - A cos ฯ‰0t
Q953.
A circuit which cannot demodulate SSB is

a.

balanced modulator

b.

product detector

c.

BFO

d.

phase discriminator

Discuss
Answer: (d).phase discriminator
Q954.
In TV system in India IF video and IF audio frequencies are

a.

33.4 and 28.4 MHz respectively

b.

38.9 and 33.4 MHz respectively

c.

43.8 and 38.9 MHz respectively

d.

33.4 and 38.9 MHz respectively

Discuss
Answer: (b).38.9 and 33.4 MHz respectively
Q955.
While AM has __________ frequencies, FM has __________ number of sidebands.

a.

2, 3

b.

3, 3

c.

3, 5

d.

3, infinite

Discuss
Answer: (d).3, infinite
Q956.
In VHS format diameter of head drum is about

a.

1 m

b.

20 cm

c.

6 cm

d.

1 cm

Discuss
Answer: (c).6 cm
Q957.
The correct sequence of subsystem in an FM receiver is

a.

mixer, RF amplifier, limiter, IF amplifier, discriminator, audio amplifier

b.

RF amplifier, mixer, IF amplifier, limiter, discriminator, audio amplifier

c.

RF amplifier, mixer, limiter, discriminator, IF amplifier, audio amplifier

d.

mixer, IF amplifier, limiter, audio amplifier, discriminator

Discuss
Answer: (b).RF amplifier, mixer, IF amplifier, limiter, discriminator, audio amplifier
Q958.
A wave is frequency modulated with an index of 0.1 and its frequency is multiplied by 8 times, the modulation index is

a.

not changed

b.

decreased 8 times

c.

increased 4 times

d.

increased 8 times

Discuss
Answer: (a).not changed
Q959.
Short circuited stubs are preferred to O.C stubs because

a.

O.C stubs are incapable of giving full range of reactances

b.

O.C stubs are liable to radiate

c.

O.C stubs are difficult to make and connect

d.

none of the above

Discuss
Answer: (b).O.C stubs are liable to radiate
Q960.
Assertion (A): In FM all power amplifiers can be operated in class C

Reason (R): FM is a constant amplitude modulation system.

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: (a).Both A and R are correct and R is correct explanation of A
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