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 119 of 120

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Q1181.
Which of the following statements is correct?

a.

Convex lens has positive focal power and concave lens have negative focal power

b.

Convex lens has negative focal power and concave lens have positive focal power

c.

All lens have positive focal power

d.

All lens have negative focal power

Discuss
Answer: (a).Convex lens has positive focal power and concave lens have negative focal power
Q1182.
To eliminate ghosts in the picture

a.

use a longer transmission line

b.

connect a booster

c.

change the antenna orientation of location

d.

twist the transmission line

Discuss
Answer: (c).change the antenna orientation of location
Q1183.
The frequency range of 300 kHz to 3000 kHz is known as

a.

low frequency

b.

medium frequency

c.

high frequency

d.

very high frequency

Discuss
Answer: (b).medium frequency
Q1184.
Which of the following does not cause losses in optical fibre cables?

a.

Stepped index operation

b.

Impurities

c.

Microbending

d.

Attenuation in glass

Discuss
Answer: (a).Stepped index operation
Q1185.
For a low level AM system, the amplifiers modulated stage must be

a.

linear devices

b.

harmonic devices

c.

class C amplifiers

d.

non-linear devices

Discuss
Answer: (a).linear devices
Q1186.
In figure the output v(t) is

a.

an amplitude modulated signal

b.

a frequency modulated signal

c.

a phase modulated signal

d.

none of the above

Discuss
Answer: (b).a frequency modulated signal
Q1187.
If Pk be the probability of the message to be received or transmitted, then the amount of information (Ik) associated, in bits, will be

a.

A

b.

B

c.

C

d.

D

Discuss
Answer: (d).D
Q1188.
The ratio given by below equation for 100% amplitude modulation with identical total transmitted power (mf is modulation index of FM) is

a.

9/2 mf²

b.

3/2 m²f

c.

3/2 mf³

d.

9/2 m³f

Discuss
Answer: (b).3/2 m²f
Q1189.
The power density spectrum of noise voltage at the input of a network is Sni and that at the output of the network is Sno. If transfer function of network is H(ฯ‰), the corresponding noise figure is

a.

A

b.

B

c.

C

d.

D

Discuss
Answer: (a).A
Q1190.
The modulation index of an AM wave is measured using a CRO. The waveform is as shown in figure, the modulation index is nearly

a.

43%

b.

30%

c.

23%

d.

17%

Discuss
Answer: (a).43%
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