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 37 of 120

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Q361.
A computer monitor uses 180 W in normal operation and 20 W in sleep mode. The computer is on all the 24 hours but is in sleep mode for 18 hours a days. The energy units saved in 30 days are

a.

0.54 units

b.

86.4 units

c.

2.88 units

d.

4.8 units

Discuss
Answer: (b).86.4 units
Q362.
Consider the following functions

1. It detects the AM video carrier IF so as to produce the video signal
2. It produces and separates out the inter carrier sound IF of 5.5 MHz
3. It amplifies the video signal
4. It amplifies the audio signal

The video detector in a colour TV performs which of the above functions

a.

1, 2 and 3

b.

1, 2, 3 and 4

c.

1 and 2

d.

1, 2 and 4

Discuss
Answer: (c).1 and 2
Q363.
A 1000 kHz carrier is simultaneously modulated by 300 Hz and 2 kHz audio sine wave. Which of the following frequencies will not be present in the output?

a.

998 kHz

b.

999.7 kHz

c.

1000.3 kHz

d.

700 kHz

Discuss
Answer: (d).700 kHz
Q364.
SWR for a transmission line is infinity when the load is

1. Short circuit
2. Complex impedance
3. Open circuit
4. Pure reactance

Of the above statements:

a.

1, 3, 4 are correct

b.

1 and 3 are correct

c.

2, 3, 4 are correct

d.

1, 2, 4 are correct

Discuss
Answer: (b).1 and 3 are correct
Q365.
The discone antenna is

a.

used in UHF range

b.

circularly polarized

c.

used in radar

d.

used as a direction finding antenna

Discuss
Answer: (a).used in UHF range
Q366.
The direction of pick up in a CD is

a.

linear from centre towards edge

b.

linear from edge to centre

c.

nonlinear from centre to edge

d.

nonlinear from edge to center

Discuss
Answer: (a).linear from centre towards edge
Q367.
A (75 - j 50) ฮฉ load is connected to a coaxial line of Z0 = 75 ฮฉ at 10 GHz. The best method of matching consists of using

a.

a capacitance at some specific distance from load

b.

a short circuited stub at some specific distance from load

c.

an inductance at load

d.

a short circuited stub at load

Discuss
Answer: (d).a short circuited stub at load
Q368.
Consider the following test signal patterns

1. Ramp
2. Grill
3. Grey shades
4. Sine pulse
5. Picture line up generating equipment

Which of the above are used in TV studios?

a.

All

b.

1, 2 and 3 only

c.

1, 2 and 5 only

d.

2, 3, 4 and 5 only

Discuss
Answer: (a).All
Q369.
If aspect ratio is 4/3 and number of lines in each frame is 625, the number of picture elements in one frame is

a.

4/3 x 625

b.

4/3(625)²

c.

625²

d.

3/4(625)²

Discuss
Answer: (b).4/3(625)²
Q370.
Indicate the false statement: If SWR on a transmission line is infinite, the line is terminated in

a.

open circuit

b.

short circuit

c.

pure reactance

d.

complex impedance

Discuss
Answer: (d).complex impedance
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