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 64 of 120

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Q631.
A lens has a hyperfocal distance of 7.5 m. It is focused at 7.5 m. Then

a.

all objects from 7.5 m to infinity will appear in focus

b.

all objects from 3.75 m to infinity will appear in focus

c.

all objects from 0 to 7.5 m will appear in focus

d.

all objects from 0 to 3.75 m will appear in focus

Discuss
Answer: (b).all objects from 3.75 m to infinity will appear in focus
Q632.
In FM 'guard band' is provided

a.

to limit upper frequency limit

b.

to limit lower frequency limit

c.

so that there is less adjacent channel interference

d.

to limit transmitted power of a station

Discuss
Answer: (c).so that there is less adjacent channel interference
Q633.
Assertion (A): FM requires more bandwidth than AM

Reason (R): Wide band FM is used for broadcast transmissions.

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
Q634.
A frequency doubler has an FM signal input at 13 MHz with a deviation of 5 kHz. The output, frequency for the carrier will be

a.

26 MHz

b.

26.1 MHz

c.

10 kHz

d.

160 kHz

Discuss
Answer: (d).160 kHz
Q635.
In FSK no synchronous carrier is needed at the receiver

a.

true

b.

false

c.

depend on distance

d.

none

Discuss
Answer: (b).false
Q636.
When the modulating frequency is doubled, the modulation index is halved and the modulating voltage remains constant. The modulation system is

a.

FM

b.

AM

c.

phase modulation

d.

none of the above

Discuss
Answer: (a).FM
Q637.
Vividh Bharti programme is transmitted in

a.

short wave

b.

medium frequency

c.

all of the above

d.

none of the above

Discuss
Answer: (c).all of the above
Q638.
In a Vidicon camera tube, the beam current is controlled by

a.

grid G1

b.

grid G2

c.

grids G1, G2, G3

d.

grid G2, G3

Discuss
Answer: (a).grid G1
Q639.
If D is diagonal and F is focal length, lens angle ΞΈ is

a.

ΞΈ = tanβ€Ύ¹ (D/F)

b.

ΞΈ = 2 tanβ€Ύ¹ (D/F)

c.

ΞΈ = tanβ€Ύ¹ (D/2F)

d.

ΞΈ = 2 tanβ€Ύ¹ (D/2F)

Discuss
Answer: (d).ΞΈ = 2 tanβ€Ύ¹ (D/2F)
Q640.
Present day stereophonic systems have

a.

only CD playback facility

b.

only tape playback facility

c.

both CD and tape playback facilities along with radio

d.

none of the above

Discuss
Answer: (c).both CD and tape playback facilities along with radio
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