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 6 of 120

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Q51.
If F(ฯ‰) is Fourier transform of f(t), then Fourier transform of f(t) cos² ฯ‰ct is

a.

A

b.

B

c.

C

d.

D

Discuss
Answer: (a).A
Q52.
The circuit of figure give an output which is

a.

a frequency modulated signal

b.

an amplitude modulated signal

c.

a phase modulated signal

d.

none of the above

Discuss
Answer: (a).a frequency modulated signal
Q53.
A carrier A cos ฯ‰ct is modulated by a signal mt A cos ฯ‰โ‚t + mโ‚‚ A cos ฯ‰โ‚‚t + mโ‚ƒ A cos ฯ‰โ‚ƒt. The total modulated power is

a.

A

b.

B

c.

C

d.

D

Discuss
Answer: (a).A
Q54.
If an isotropic source is radiating power P in all directions, the electric field at a distance d from the source is proportional to

a.

A

b.

B

c.

C

d.

D

Discuss
Answer: (c).C
Q55.
Waveform shown in figure is that for

a.

FM

b.

PCM

c.

AM-DSB

d.

AM-SSB

Discuss
Answer: (c).AM-DSB
Q56.
In a TV studios, flying spot scanner is a device for

a.

mixing video and audio signals

b.

telecasting feature films

c.

live telecast of outdoor programs

d.

telecast of indoor music programs

Discuss
Answer: (b).telecasting feature films
Q57.
A broadcast radio transmitter radiates 5 kW when the modulation percentage is 60. How much of this is carrier power?

a.

6.66 kW

b.

5 kW

c.

4.9 kW

d.

4.23 kW

Discuss
Answer: (d).4.23 kW
Q58.
A device has two resistances 300 ฮฉ and 200 ฮฉ respectively. The noise voltages due to these two resistance calculated separately are 5.38 ฮผV and 4.38 ฮผV respectively. When both of them are used together, the noise voltage will be

a.

9.76 V

b.

1 ฮผV

c.

23.56 ฮผV

d.

6.94 ฮผV

Discuss
Answer: (d).6.94 ฮผV
Q59.
A directional microphone gives an output of 0.5 mV whereas an omnidirectional one gives an output of 0.5 ฮผV in the same position for the same sound pressure. The directivity of the directional microphone is

a.

120 dB

b.

90 dB

c.

60 dB

d.

30 dB

Discuss
Answer: (c).60 dB
Q60.
If Eb, the energy per bit of a binary digital signal is 10โ€พโถ watt sec. and the one sided power spectral density of the white noise N0 = 10โ€พโต W/Hz, then the output SNR of the matched filter is

a.

26 dB

b.

10 dB

c.

20 dB

d.

13 dB

Discuss
Answer: (d).13 dB
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