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 16 of 120

Discover more Topics under Electronics and Communication Engineering

Q151.
An FM signal with a deviation ฮด is passed through a mixer, and has its frequency reduced 5 fold. The deviation in the output of the mixer is

a.

5/ฮด

b.

Intermediate

c.

ฮด/5

d.

ฮด

Discuss
Answer: (d).ฮด
Q152.
In PCM, if the number of quantization levels is increased from 4 to 64, then the bandwidth requirement will approximately be increased __________ times.

a.

8

b.

16

c.

3

d.

32

Discuss
Answer: (c).3
Q153.
A tweeter should be fed from the input through a

a.

low pass filter

b.

high pass filter

c.

band pass filter

d.

band stop filter

Discuss
Answer: (b).high pass filter
Q154.
The modulation index is, if fm = 500 Hz, ฮ”f = 2.25 kHz

a.

2.25

b.

4.5

c.

9

d.

18

Discuss
Answer: (b).4.5
Q155.
Which of the following is true in a tape recorder?

a.

Vow is due to variation in motor speed but flutter is due to some other reason

b.

Both vow and flutter are due to variations in motor speed

c.

Flutter is due to variation in motor speed but vow is due to some other reason

d.

Neither vow nor flutter is due to variation in motor speed

Discuss
Answer: (b).Both vow and flutter are due to variations in motor speed
Q156.
What is the RF amplifier plate voltage when the audio-modulating voltage is +600 V?

a.

-600 V

b.

Zero

c.

600 V

d.

1200 V

Discuss
Answer: (c).600 V
Q157.
If carrier power is P and amplitude modulation index is m, the total power after modulation is

a.

A

b.

B

c.

C

d.

D

Discuss
Answer: (d).D
Q158.
In figure the output v(t) is

a.

phase modulated signal

b.

amplitude modulated signal

c.

frequency modulated signal

d.

none of the above

Discuss
Answer: (c).frequency modulated signal
Q159.
Efficiency of general AM signal with em = Eโ‚ cos ฯ‰โ‚t + Eโ‚‚ cos ฯ‰โ‚‚ tj ec = Ec cos ฯ‰ct; Eโ‚ cos ฯ‰โ‚t with modulation index mโ‚‚ is __________ .

a.

A

b.

B

c.

C

d.

D

Discuss
Answer: (a).A
Q160.
Each of the following equation expressing decibel gain is correct except

a.

A

b.

B

c.

C

d.

D

Discuss
Answer: (b).B
Page 16 of 120