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 68 of 120

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Q671.
Each of the following equation expressing decibel gain is correct except

a.

A

b.

B

c.

C

d.

D

Discuss
Answer: (b).B
Q672.
Waves travel on each of the line configurations in figure. In which case would the radiation be maximum

a.

A

b.

B

c.

C

d.

D

Discuss
Answer: (d).D
Q673.
The figure shows a simple detector circuit for amplitude modulated wave v(t) = (1 + m cos ฯ‰mt) cost ฯ‰ct. If the detector is to follow the envelope of modulated wave at all times the extent of modulation m must be less than or equal to m0 where m0 is given by equation

a.

A

b.

B

c.

C

d.

D

Discuss
Answer: (a).A
Q674.
In an AM system, doubling of modulation index doubles the antenna current. The system is

a.

single side band full carrier

b.

vestigial side band

c.

single side band suppressed carrier

d.

double side band full carrier

Discuss
Answer: (c).single side band suppressed carrier
Q675.
A frequency multiplier stage should operate as

a.

class A

b.

class AB

c.

class C

d.

either of the above

Discuss
Answer: (c).class C
Q676.
UHF range is

a.

30 MHz to 300 MHz

b.

300 MHz to 3000 MHz

c.

3000 MHz to 30, 000 MHz

d.

above 30, 000 MHz

Discuss
Answer: (b).300 MHz to 3000 MHz
Q677.
A carrier signal at frequency 100 MHz is frequency modulated with modulation index 2 by a signal at 2 kHz. At what frequencies are the sidebands produced?

a.

102 MHz and 98 Mhz

b.

100 MHz + 2 kHz, 100 MHz - 2 kHz

c.

100 MHz ± ฮ”fd where fd is frequency deviation

d.

100 MHz ± 3n kHz, where n is 1, 2, ... S integer

Discuss
Answer: (d).100 MHz ± 3n kHz, where n is 1, 2, ... S integer
Q678.
Which is not purpose of modulation?

a.

Effective radiation

b.

Multiplexing

c.

Narrow band

d.

Increase in signal power

Discuss
Answer: (d).Increase in signal power
Q679.
If ฯ‰ is the frequency of modulating voltage in FM, the modulation index is proportional to

a.

ฯ‰

b.

1/ฯ‰

c.

โˆšฯ‰

d.

1/โˆšฯ‰

Discuss
Answer: (b).1/ฯ‰
Q680.
Which camera tube has gamma of almost unity?

a.

Vidicon

b.

Plumbicon

c.

New vicon

d.

Saticon

Discuss
Answer: (d).Saticon
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