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 19 of 120

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Q181.
In an AM wave the carrier and one of the side bands is suppressed. If m = 1, the percentage saving in power is

a.

25%

b.

50%

c.

66.6%

d.

83.3%

Discuss
Answer: (d).83.3%
Q182.
Assertion (A): An electronic tuner uses varactor diode

Reason (R): The capacitance of a varactor diode depends on the magnitude of reverse bias.

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: (a).Both A and R are correct and R is correct explanation of A
Q183.
A superheterodyne receiver is to operate in the frequency range 550 kHz - 1650 kHz, with the intermediate frequency of 450 kHz. Let R = Cmin/Cmax denote the required capacitance ratio of the local oscillator and I denote the image frequency (in kHz) of the incoming signal. If the receiver is tuned to 700 kHz, then

a.

R = 4.41 J =1600

b.

R = 2.10 J =1150

c.

R = 3.0 J =1600

d.

R = 9.0 J =1150

Discuss
Answer: (a).R = 4.41 J =1600
Q184.
In a tape recorder the output from RF oscillator is given to

a.

only erase head coil

b.

only record head coil

c.

coils of both erase head and record head

d.

none of the above

Discuss
Answer: (a).only erase head coil
Q185.
A + 1.9 lens has a focal length of 25 mm. The diameter of lens is about

a.

13 mm

b.

1.3 mm

c.

130 mm

d.

none of the above

Discuss
Answer: (a).13 mm
Q186.
Which of the following terms are applicable to troposcatter propagation?

a.

Faradays rotation

b.

SIOs

c.

Fading

d.

Atmospheric storms

Discuss
Answer: (c).Fading
Q187.
If the amplitude of the voltage is kept constant, but its frequency is raised to 6 kHz, the new deviation will be for the modulation index is, if fm = 500 Hz, ฮ”f = 2.25

a.

6 kHz

b.

12 kHz

c.

27 kHz

d.

54 kHz

Discuss
Answer: (c).27 kHz
Q188.
In TV scanning sequence of lines is

a.

left to right

b.

right to left

c.

left to right for odd fields and right to left for even field

d.

left to right for even fields and right to left for odd field

Discuss
Answer: (a).left to right
Q189.
In equally tampered scale, frequency of each tone equals the frequency of lower adjacent tone multiplied by

a.

(2)^1/7

b.

(2)^1/12

c.

(2)^1/6

d.

(2)^1/5

Discuss
Answer: (b).(2)^1/12
Q190.
A carrier is modulated by two modulating waves A and B having modulation indices of 0.6 and 0.8 respectively. The overall modulation index is

a.

1

b.

0.7

c.

0.2

d.

1.4

Discuss
Answer: (a).1
Page 19 of 120