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 107 of 120

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Q1061.
Thermal noise is passed through an ideal low pass filter having cut off at fc = ฯ‰ Hz. The auto-correlation value of the noise at the output of the filter is given as

a.

a delta function at t = 0

b.

gaussian over the range -โˆž โ‰ค t โ‰ค โˆž

c.

sin c function over the range -โˆž โ‰ค t โ‰ค โˆž

d.

none of the above

Discuss
Answer: (c).sin c function over the range -โˆž โ‰ค t โ‰ค โˆž
Q1062.
The tuned circuit of the oscillator in a simple AM transmitter employs a 50 H coil and a 1 nanofarad capacitor. If the oscillator output is the carrier frequency will be

a.

448 kHz

b.

555 kHz

c.

625 kHz

d.

712 kHz

Discuss
Answer: (d).712 kHz
Q1063.
In a low level AM system, the amplifier which follows the modulated stage must be the

a.

linear device

b.

harmonic device

c.

class C amplifier

d.

non-linear device

Discuss
Answer: (a).linear device
Q1064.
In a square law modulator, the carrier frequency should be __________ times than the highest modulating frequency.

a.

1

b.

2

c.

4

d.

3

Discuss
Answer: (d).3
Q1065.
CSSB stands for

a.

Compatible Single Sideband

b.

Compressed Single Sideband

c.

Carrier Single Sideband

d.

Coded Single Sideband

Discuss
Answer: (a).Compatible Single Sideband
Q1066.
Tropospheric scatter is used with frequencies in the range of

a.

VLF

b.

HF

c.

UHF

d.

VHF

Discuss
Answer: (b).HF
Q1067.
In Modulation, "carrier" is

a.

resultant wave

b.

speech voltage to be transmitted

c.

voltage with constant frequency, phase or amplitude

d.

voltage for which frequency, phase or amplitude is varied

Discuss
Answer: (d).voltage for which frequency, phase or amplitude is varied
Q1068.
Which one of the following blocks is not common in both AM and FM receivers?

a.

RF amplifier

b.

Mixer

c.

IF amplifier

d.

Slope detector

Discuss
Answer: (d).Slope detector
Q1069.
If the variance ฯƒx² of d(n) = x(n) - x(n - 1) is one-tenth the variance ฯƒx² of a stationary zero mean discrete time signal x(n), then the normalized autocorrelation function Rxx(x)/ฯƒx² at k = 1 is

a.

0.95

b.

0.90

c.

0.10

d.

0.05

Discuss
Answer: (c).0.10
Q1070.
Which of the following is not advantage of FM over AM?

a.

Noise immunity

b.

Capture effect

c.

Fidelity

d.

Spluttering effect

Discuss
Answer: (d).Spluttering effect
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