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 5 of 120

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Q41.
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(ω), the corresponding noise figure is

a.

A

b.

B

c.

C

d.

D

Discuss
Answer: (a).A
Q42.
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%
Q43.
On a smooth surface, the line of sight distance between transmitting antenna (height ht metres) and receiving antenna (height hr metres) is about

a.

A

b.

B

c.

C

d.

D

Discuss
Answer: (d).D
Q44.
Which stage generates RF carrier?

a.

Amplifier

b.

Oscillator

c.

Power supply

d.

All of the above

Discuss
Answer: (b).Oscillator
Q45.
If F(ω) is Fourier transform of f(t), then Fourier transform of f(t) cos² ωct is

a.

A

b.

B

c.

C

d.

D

Discuss
Answer: (a).A
Q46.
The circuit of figure give an output which is

a.

a frequency modulated signal

b.

an amplitude modulated signal

c.

a phase modulated signal

d.

none of the above

Discuss
Answer: (a).a frequency modulated signal
Q47.
A carrier A cos ωct is modulated by a signal mt A cos ω₁t + m₂ A cos ω₂t + m₃ A cos ω₃t. The total modulated power is

a.

A

b.

B

c.

C

d.

D

Discuss
Answer: (a).A
Q48.
If an isotropic source is radiating power P in all directions, the electric field at a distance d from the source is proportional to

a.

A

b.

B

c.

C

d.

D

Discuss
Answer: (c).C
Q49.
Waveform shown in figure is that for

a.

FM

b.

PCM

c.

AM-DSB

d.

AM-SSB

Discuss
Answer: (c).AM-DSB
Q50.
Which of the following operation are performed on linear queues?

1. Testing a linear queue for underflow
2. Enqueue operation
3. Dequeue operation
4. Testing a linear queue for overflow

Select the correct answer using the codes given below the lists

a.

1, 2 and 3

b.

2, 3 and 4

c.

1, 3 and 4

d.

1, 2, 3 and 4

Discuss
Answer: (d).1, 2, 3 and 4
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