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 4 of 120

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Q31.
Energy content of atmospheric noise

a.

does not depend on frequency

b.

decreases as frequency is increased

c.

increases as frequency is increased

d.

either (a) or (c) depending on the temperature

Discuss
Answer: (b).decreases as frequency is increased
Q32.
As the frequency increases, the absorption of ground wave by earth's surface

a.

decreases

b.

increases

c.

remains the same

d.

either (a) or (c)

Discuss
Answer: (b).increases
Q33.
The velocity of sound waves in air

a.

is constant at all temperatures

b.

varies directly as temperature

c.

varies inversely as absolute temperature

d.

varies directly as square root of absolute temperature

Discuss
Answer: (d).varies directly as square root of absolute temperature
Q34.
The range of a cordless telephone is about

a.

1000 m

b.

500 m

c.

100 m

d.

10 m

Discuss
Answer: (c).100 m
Q35.
An earth mat for a communication tower consists of

a.

one or two radials extending from base of tower at a depth of about 5 cm below ground

b.

a large number of radials extending from base of tower at a depth of about 3 m

c.

a large number of radials extending from base of tower at a depth of about 30 cm

d.

none of the above

Discuss
Answer: (c).a large number of radials extending from base of tower at a depth of about 30 cm
Q36.
Degaussing in a picture tube means

a.

Adding magnetism in mask and mounting frame

b.

Removing residual magnetism in mask, shield etc...

c.

Increasing resistance of coils to decrease time constant

d.

Decreasing resistance of coils to increase time constant.

Discuss
Answer: (b).Removing residual magnetism in mask, shield etc...
Q37.
If B is channel bandwidth, S is signal power and N is the total noise within the channel bandwidth, the channel capacity C of a white band limited gaussian channel is

a.

A

b.

B

c.

C

d.

D

Discuss
Answer: (a).A
Q38.
For an RC low pass filter, the relation between noise bandwidth BN and 3-dB bandwidth B3dB is

a.

A

b.

B

c.

C

d.

D

Discuss
Answer: (a).A
Q39.
The block diagram of AM transmitter in which high level modulation is used as shown in figure. The block X could be

a.

audio power amplifier

b.

buffer RF amplifier

c.

compressor amplifier

d.

none of the above

Discuss
Answer: (b).buffer RF amplifier
Q40.
When E1, E2, E3 etc. are the simultaneous modulating voltages, then the total modulating voltage Et will be

a.

A

b.

B

c.

C

d.

D

Discuss
Answer: (c).C
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