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 17 of 120

Discover more Topics under Electronics and Communication Engineering

Q161.
The received signal frequency at any time of a super-heterodyne receiver having IF = 456 kHz is 1 MHz. The corresponding image signal is

a.

within the medium band

b.

outside the medium band

c.

depend upon modulation index

d.

depends on Modulating frequency

Discuss
Answer: (a).within the medium band
Q162.
A 300 Hz sound wave of intensity 20 dB is transmitted by a 1500 kHz radio wave by frequency modulation. It is seen that instantaneous frequency varies between 1500.2 kHz and 1499.8 kHz, 300 times a second. If the intensity of sound wave is 100 dB.

a.

The instantaneous frequency variations will be between 1500.2 and 1499.8 kHz, 1500 times a second

b.

The instantaneous frequency variations will be between 1501 and 1499 kHz, 1500 times a second

c.

The instantaneous frequency variations will be between 1501 and 1499 kHz, 300 times a second

d.

The instantaneous frequency variations will be between 1501 and 1499 kHz, 60 times a second

Discuss
Answer: (c).The instantaneous frequency variations will be between 1501 and 1499 kHz, 300 times a second
Q163.
In a reactance FET, gm = 9 x 10โ€พ³ Siemens, gate to source resistance is one-ninth of reactance of gate to drain capacitor and frequency is 4 MHz. The capacitive-reactance is

a.

1000 ฮฉ

b.

1/1000 ฮฉ

c.

36 x 10³ ฮฉ

d.

4/9 x 10³ ฮฉ

Discuss
Answer: (a).1000 ฮฉ
Q164.
Audio cassettes used in household tape recorders have a width of

a.

1"

b.

1/2"

c.

1/4"

d.

1/8"

Discuss
Answer: (c).1/4"
Q165.
The receiver of a pulsed RADAR can detect signal power in the order of

a.

1 W

b.

0.1 W

c.

10โ€พโต W

d.

10โ€พ¹² W

Discuss
Answer: (d).10โ€พ¹² W
Q166.
In a 100% amplitude modulated signal, the power in the upper sideband when carrier power is to be 100 W and modulation system SSBSC, is

a.

100 W

b.

66 W

c.

50 W

d.

25 W

Discuss
Answer: (d).25 W
Q167.
The number of channels in a stereophonic system is

a.

8

b.

4

c.

2

d.

1

Discuss
Answer: (c).2
Q168.
When the carrier is unmodulated, a certain transmitter radiates 9 kW when the carrier is sinusoidally modulated the transmitter radiates 10.125 kW. The modulation index will be

a.

0.1

b.

10.15

c.

0.4

d.

0.5

Discuss
Answer: (d).0.5
Q169.
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
Q170.
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
Page 17 of 120