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 12 of 120

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Q111.
Consider the following statements about Yagi Uda antenna

1. It is unidirectional
2. Its gain is about 7 dB
3. It is used at VLF
4. The optimum separation is 0.11

Which of the above are correct?

a.

1 and 2 only

b.

1, 2, 4 only

c.

1, 2, 3, 4

d.

1 and 4 only

Discuss
Answer: (b).1, 2, 4 only
Q112.
In a two stage cascade amplifier, each stage has a gain of 10 dB and noise figure of 10 dB. The overall noise factor is

a.

10

b.

1.09

c.

1

d.

10.9

Discuss
Answer: (d).10.9
Q113.
An AM signal and a narrowband FM signal with identical carriers, modulating signals and modulation index of 0.1 are added together. The resultant signal can be closely approximated by

a.

Broadband FM

b.

SSB with carrier

c.

DSB-SC

d.

SSB without carrier

Discuss
Answer: (b).SSB with carrier
Q114.
The equation v(t) = A cos [ωct + φ(t)] where A and ωc are constant and φ(t) is a function of base signal represents

1. Phase modulation
2. Amplitude modulation
3. Angle modulation
4. Frequency modulation

Which of the above are true?

a.

3 only

b.

1, 3 and 4

c.

1, 2, 3, 4

d.

3 and 4 only

Discuss
Answer: (b).1, 3 and 4
Q115.
An FM signal with deviation δ is passed through mixer. Its frequency is reduced five fold. The deviation in output of mixer is

a.

0.28

b.

δ

c.

5 δ

d.

very very high

Discuss
Answer: (b).δ
Q116.
The total number of channels allotted for cellular telephone is

a.

666

b.

333

c.

221

d.

111

Discuss
Answer: (a).666
Q117.
It is found that in a telephone system 60 subscribers initiate calls during a 30 minute interval and the total duration of all the calls is 100 minutes. The load is

a.

2

b.

3 erlang

c.

3.333 erlang

d.

0.333 erlang

Discuss
Answer: (c).3.333 erlang
Q118.
E and H fields are perpendicular to each other.

a.

True

b.

False

c.

May be True or False

d.

Can't say

Discuss
Answer: (a).True
Q119.
Consider the following:

1. A TV receiver antenna should pick up the TV signal and develop maximum voltage from the available strength of signal
2. It should reject unwanted signals
3. It should not suffer from co-channel interference
4. It should have a very narrowband

The correct statements are

a.

1 and 2 only

b.

1, 2 and 3 only

c.

1, 2, 3, 4

d.

2, 3 only

Discuss
Answer: (b).1, 2 and 3 only
Q120.
If transmission bandwidth is doubled in FM, SNR is

a.

doubled

b.

raised four times

c.

decreased four times

d.

halved

Discuss
Answer: (c).decreased four times
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