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 4 of 120

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Q31.
What is the RF amplifier plate voltage when the audio-modulating voltage is +600 V?

a.

-600 V

b.

Zero

c.

600 V

d.

1200 V

Discuss
Answer: (c).600 V
Q32.
If carrier power is P and amplitude modulation index is m, the total power after modulation is

a.

A

b.

B

c.

C

d.

D

Discuss
Answer: (d).D
Q33.
In figure the output v(t) is

a.

phase modulated signal

b.

amplitude modulated signal

c.

frequency modulated signal

d.

none of the above

Discuss
Answer: (c).frequency modulated signal
Q34.
Efficiency of general AM signal with em = Eโ‚ cos ฯ‰โ‚t + Eโ‚‚ cos ฯ‰โ‚‚ tj ec = Ec cos ฯ‰ct; Eโ‚ cos ฯ‰โ‚t with modulation index mโ‚‚ is __________ .

a.

A

b.

B

c.

C

d.

D

Discuss
Answer: (a).A
Q35.
Each of the following equation expressing decibel gain is correct except

a.

A

b.

B

c.

C

d.

D

Discuss
Answer: (b).B
Q36.
Waves travel on each of the line configurations in figure. In which case would the radiation be maximum

a.

A

b.

B

c.

C

d.

D

Discuss
Answer: (d).D
Q37.
The figure shows a simple detector circuit for amplitude modulated wave v(t) = (1 + m cos ฯ‰mt) cost ฯ‰ct. If the detector is to follow the envelope of modulated wave at all times the extent of modulation m must be less than or equal to m0 where m0 is given by equation

a.

A

b.

B

c.

C

d.

D

Discuss
Answer: (a).A
Q38.
In figure the output v(t) is

a.

an amplitude modulated signal

b.

a frequency modulated signal

c.

a phase modulated signal

d.

none of the above

Discuss
Answer: (b).a frequency modulated signal
Q39.
If Pk be the probability of the message to be received or transmitted, then the amount of information (Ik) associated, in bits, will be

a.

A

b.

B

c.

C

d.

D

Discuss
Answer: (d).D
Q40.
The ratio given by below equation for 100% amplitude modulation with identical total transmitted power (mf is modulation index of FM) is

a.

9/2 mf²

b.

3/2 m²f

c.

3/2 mf³

d.

9/2 m³f

Discuss
Answer: (b).3/2 m²f
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