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 39 of 120

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Q381.
In band III of TV, distant reception (beyond line of sight range) is possible due to

a.

tropospheric bending by refraction

b.

reflection of waves

c.

ionospheric scattering

d.

none of the above

Discuss
Answer: (a).tropospheric bending by refraction
Q382.
In FM noise can be decreased by a feature that AM does not have

a.

increasing deviation

b.

decreasing deviation

c.

reducing modulation index

d.

increasing modulation index

Discuss
Answer: (c).reducing modulation index
Q383.
In case of stabilized reactance modulator AFC system

a.

phase modulator is converted into frequency modulation by equalizer circuit

b.

the discriminator must have a fast time constant to provide demodulation

c.

the higher discriminator frequency, the better oscillator frequency

d.

the discriminator frequency must be too low, or the system will fail

Discuss
Answer: (c).the higher discriminator frequency, the better oscillator frequency
Q384.
Assertion (A): Demodulation of SSB and AM signals is exactly similar

Reason (R): The basic SSB demodulation device is product detector.

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: (d).A is wrong but R is correct
Q385.
In shot noise

a.

the current rises around mean value

b.

the current rises to peak value, decreases to zero and then again rises

c.

the current may become negative

d.

the current is always less than the mean value

Discuss
Answer: (d).the current is always less than the mean value
Q386.
In VCR, the chrominance signal's frequency is

a.

up converted during recording and down converted during playback

b.

down converted during recording and up converted during playback

c.

not changed during recording and playback

d.

any of the above depending on VCR system

Discuss
Answer: (b).down converted during recording and up converted during playback
Q387.
Which of the following cannot be used to demodulate SSB?

a.

Complete phase shift generator

b.

Product detector

c.

Diode balanced modulator

d.

Bipolar transistor balanced modulator

Discuss
Answer: (d).Bipolar transistor balanced modulator
Q388.
The power required to produce a gain of 10 dB over 4 W of original power is __________ watt.

a.

80

b.

40

c.

0.4

d.

8

Discuss
Answer: (c).0.4
Q389.
The inductance of connecting leads can be a source of

a.

low frequency parasitics

b.

high frequency parasitics

c.

carrier frequency parasitics

d.

none of the above

Discuss
Answer: (b).high frequency parasitics
Q390.
For F2 layer the critical frequency is about

a.

500 MHz

b.

100 MHz

c.

25 MHz

d.

10 MHz

Discuss
Answer: (d).10 MHz
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