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 8 of 120

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Q71.
Radio broadcasts are generally

a.

amplitude modulation

b.

frequency modulation

c.

both amplitude and frequency modulation

d.

neither amplitude nor frequency modulation

Discuss
Answer: (b).frequency modulation
Q72.
If the frequency of a wave 20 Hz, the time period is

a.

20 secs

b.

2 secs

c.

0.2 secs

d.

0.05 secs

Discuss
Answer: (d).0.05 secs
Q73.
In radar systems PRF stands for

a.

Power Return Factor

b.

Pulse Return Factor

c.

Pulse Repetition Frequency

d.

Pulse Response Factor

Discuss
Answer: (c).Pulse Repetition Frequency
Q74.
Which of the following cannot be the Fourier series expansion of a periodic signal?

a.

x(t) = 2 cos t + 3 cos 3t

b.

x(t) = 2 cos ฯ€t + 7 cos t

c.

x(t) = cos t + 0.5

d.

x(t) = 2 cos 1.5ฯ€t + sin 3.5 pt

Discuss
Answer: (c).x(t) = cos t + 0.5
Q75.
Which of the following is the indirect way of FM generation?

a.

Reactance bipolar transistor modulator

b.

Armstrong modulator

c.

Varactor diode modulator

d.

Reactance FM modulator

Discuss
Answer: (b).Armstrong modulator
Q76.
A telephone exchange has 9000 subscribers. If the number of calls originating at peak time is 10, 000 in one hour, the calling rate is

a.

0.9

b.

10/9

c.

0.81

d.

0.1

Discuss
Answer: (b).10/9
Q77.
A cordless telephone using separate frequencies for transmission in base and portable units is known as

a.

duplex arrangement

b.

half duplex arrangement

c.

either (a) or (b)

d.

neither (a) nor (b)

Discuss
Answer: (a).duplex arrangement
Q78.
In figure the output v(t) is

a.

an amplitude modulated signal

b.

a frequency modulated signal

c.

a phase modulated signal

d.

none of the above

Discuss
Answer: (b).a frequency modulated signal
Q79.
If Pk be the probability of the message to be received or transmitted, then the amount of information (Ik) associated, in bits, will be

a.

A

b.

B

c.

C

d.

D

Discuss
Answer: (d).D
Q80.
The ratio given by below equation for 100% amplitude modulation with identical total transmitted power (mf is modulation index of FM) is

a.

9/2 mf²

b.

3/2 m²f

c.

3/2 mf³

d.

9/2 m³f

Discuss
Answer: (b).3/2 m²f
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