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 7 of 120

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Q61.
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
Q62.
Which stage generates RF carrier?

a.

Amplifier

b.

Oscillator

c.

Power supply

d.

All of the above

Discuss
Answer: (b).Oscillator
Q63.
If F(ฯ‰) is Fourier transform of f(t), then Fourier transform of f(t) cos² ฯ‰ct is

a.

A

b.

B

c.

C

d.

D

Discuss
Answer: (a).A
Q64.
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
Q65.
A carrier A cos ฯ‰ct is modulated by a signal mt A cos ฯ‰โ‚t + mโ‚‚ A cos ฯ‰โ‚‚t + mโ‚ƒ A cos ฯ‰โ‚ƒt. The total modulated power is

a.

A

b.

B

c.

C

d.

D

Discuss
Answer: (a).A
Q66.
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
Q67.
Waveform shown in figure is that for

a.

FM

b.

PCM

c.

AM-DSB

d.

AM-SSB

Discuss
Answer: (c).AM-DSB
Q68.
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
Q69.
If the average power of radar transmitters is 2 kW and the peak power of the transmitter is 1000 kW, what will be the duty cycle?

a.

0.002

b.

0.02

c.

0.001

d.

0.01

Discuss
Answer: (a).0.002
Q70.
An analog signal is band limited to B Hz sampled at Nyquist rate and samples are quantized into 4 levels each with probability 1/4. The information rate is

a.

4 bits/s

b.

B bits/s

c.

4 B bits/s

d.

0.25 B bits/s

Discuss
Answer: (c).4 B bits/s
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