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 73 of 120

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Q721.
In a wave the electric field lines are vertical. Then the wave is

a.

horizontally polarized

b.

vertically polarized

c.

either (a) or (b)

d.

neither (a) nor (b)

Discuss
Answer: (b).vertically polarized
Q722.
In FM and AM the ratio of signal to noise ratio at the detector output least depends upon

a.

bandwidth

b.

transmission

c.

carrier frequency

d.

modulating frequency

Discuss
Answer: (c).carrier frequency
Q723.
Which of the following can provide two or more voice circuits with the same carrier?

a.

SSB

b.

Carrier reinsertion

c.

Lincompex

d.

Independent side band system

Discuss
Answer: (b).Carrier reinsertion
Q724.
A linear diode detector uses RC filter. As modulation index increases the maximum permissible value of time constant RC

a.

increases

b.

decreases

c.

remains constant

d.

either (a) or (c)

Discuss
Answer: (b).decreases
Q725.
In SSB generation, the most commonly used filter is

a.

low pass

b.

RC

c.

LC

d.

mechanical

Discuss
Answer: (d).mechanical
Q726.
The FM broadcast band is from

a.

550 to 1600 kHz

b.

88 to 108 kHz

c.

88 to 108 MHz

d.

1600 kHz to 59.75 MHz

Discuss
Answer: (c).88 to 108 MHz
Q727.
If k is Boltzmann's constant, Tโ‚€ is standard ambient temperature, ฮดf is bandwidth of receiver, F is noise figure, the minimum receivable signal in a radar receiver is given by

a.

k Tโ‚€(ฮดf)(F)

b.

k Tโ‚€(ฮดf)(F - 1)

c.

k Tโ‚€(ฮดf) / (F - 1)

d.

none of the above

Discuss
Answer: (b).k Tโ‚€(ฮดf)(F - 1)
Q728.
The purpose of source coding is to

a.

increase the information transmission rate

b.

decrease S/N ratio

c.

decrease the information transmission rate

d.

decrease probability of error

Discuss
Answer: (b).decrease S/N ratio
Q729.
If a source of information generates messages at the rate of r messages per second and H is entropy, the information rate is

a.

H/r

b.

1/rH

c.

rH

d.

r/H

Discuss
Answer: (c).rH
Q730.
Consider the following statements about advantages of phase discriminator over slope detector

1. Fewer tuned circuits
2. Greater limiting
3. Better linearity
4. Easy alignment

Which of the above are true?

a.

1, 2, 3, 4

b.

2, 3, 4

c.

1, 2, 3

d.

1, 3, 4

Discuss
Answer: (d).1, 3, 4
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