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

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Q151.
A signal x(t) = 100 cos (24ฯ€ x 10³t) is ideally sampled with a sampling period of 50 ฮผ sec and then passed through an ideal low pass filter with cut off frequency of 15 kHz Which of the following frequencies are present at the filter output?

a.

12 kHz only

b.

8 kHz only

c.

12 kHz and 9 kHz

d.

12 kHz and 8 kHz

Discuss
Answer: (d).12 kHz and 8 kHz
Q152.
A sinusoidal voltage of 2 kV peak value is amplitude modulated to give 20% modulation. The peak value of each side band term is

a.

400 V

b.

200 V

c.

100 V

d.

800 V

Discuss
Answer: (b).200 V
Q153.
Consider the following reasons for using antenna coupler

1. To prevent illegal radiation of spurious frequencies
2. To tune out reactive components of antenna impedance
3. To have correct value of load impedance for transmitter

Which of the above are correct?

a.

1, 2, 3

b.

1, 2

c.

1 only

d.

2, 3

Discuss
Answer: (a).1, 2, 3
Q154.
Which of the following microphones works on the principle of Faraday's law?

a.

Carbon

b.

Condenser

c.

Moving coil

d.

Electret

Discuss
Answer: (c).Moving coil
Q155.
In a CE amplifier connection, the emitter is at ground potential for

a.

AC quantities

b.

DC quantities

c.

all quantities

d.

none of the quantities

Discuss
Answer: (a).AC quantities
Q156.
In an AM wave with m = 1, the carrier is suppressed. The resulting power saving will be

a.

1/3

b.

1/2

c.

2/3

d.

3/4

Discuss
Answer: (c).2/3
Q157.
Directive gain is

a.

a power ratio

b.

a voltage ratio

c.

a current ratio

d.

a distance ratio

Discuss
Answer: (a).a power ratio
Q158.
Which of the following sampling frequencies is considered adequate in voice telephony?

a.

4 kHz

b.

8 kHz

c.

16 kHz

d.

32 kHz

Discuss
Answer: (b).8 kHz
Q159.
In telephone systems the relation between load ฯ, number of calls initiated during a specified interval ฮป and average duration of a call (h) is

a.

ฯ = ฮปh

b.

ฯ = ฮปh²

c.

ฮป = ฯh

d.

h = ฮปฯ

Discuss
Answer: (a).ฯ = ฮปh
Q160.
In a Vidicon camera tube

a.

grid G1 accelerates electrons

b.

grid G2 accelerates electrons and grid G3, slows down electrons

c.

grid G3 accelerates electrons and grid G2 slows down electrons

d.

both grids G2 and G3 accelerate electrons

Discuss
Answer: (b).grid G2 accelerates electrons and grid G3, slows down electrons
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