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 39 of 120

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Q381.
Which of the following are useful in comparing the noise performance of receivers?

1. Input noise voltage
2. Noise figure
3. Noise resistance
4. Noise temperature

Select answer as per the following codes:

a.

1, 2 and 3

b.

1, 3 and 4

c.

2, 3, 4

d.

1, 2, 4

Discuss
Answer: (c).2, 3, 4
Q382.
Push pull amplifier is

a.

class B

b.

class A

c.

class C

d.

Class A or Class C

Discuss
Answer: (a).class B
Q383.
The tape recorders used in homes have

a.

common head and common amplifier system for recording and playback

b.

different heads and amplifiers for recording and playback

c.

same head but different amplifiers for recording and playback

d.

different heads but same amplifier for recording and playback

Discuss
Answer: (a).common head and common amplifier system for recording and playback
Q384.
In a communication system, noise is most likely to affect the signal

a.

at the receiver

b.

at the transmitter

c.

at the information source

d.

in the channel

Discuss
Answer: (d).in the channel
Q385.
Each frequency in the modulating wave gives rise to four side bands.

a.

True

b.

False

c.

May be True or False

d.

Can't say

Discuss
Answer: (b).False
Q386.
Assertion (A): CCIR-B system has 625 scanning lines per frame and 2 : 1 interlace.

Reason (R): The aspect ratio is 4 : 3

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
Q387.
At night the ionosphere can be considered to be consisting of

a.

D, E, F1 and F2 layers

b.

D, E, F1 layers

c.

D, E, F2 layers

d.

E and F2 layers

Discuss
Answer: (d).E and F2 layers
Q388.
A balun transformer gives an impedance transformation of

a.

4 : 1

b.

2 : 1

c.

1 : 4

d.

1 : 2

Discuss
Answer: (a).4 : 1
Q389.
Which one of the following is true?

a.

Characteristic impedance of twin wire feeder and coaxial cable are nearly the. same

b.

The characteristic impedance of coaxial cable is more than that of twin wire cable

c.

The characteristic impedance of twin wire cable is more than that of coaxial cable

d.

The characteristic impedance of a twin wire feeder may be more or less than that of coaxial cable

Discuss
Answer: (c).The characteristic impedance of twin wire cable is more than that of coaxial cable
Q390.
A 1000 kHz carrier wave modulated 40% at 40000 Hz is applied to a resonant circuit tuned to a carrier frequency and having Q = 140. What is the degree of modulator after transmission through the circuit?

a.

40%

b.

20%

c.

0.27

d.

0.54

Discuss
Answer: (c).0.27
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