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 6 of 120

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Q51.
A broadcast radio transmitter radiates 5 kW when the modulation percentage is 60. How much of this is carrier power?
Discuss
Answer: (d).4.23 kW
Q52.
A device has two resistances 300 ฮฉ and 200 ฮฉ respectively. The noise voltages due to these two resistance calculated separately are 5.38 ฮผV and 4.38 ฮผV respectively. When both of them are used together, the noise voltage will be
Discuss
Answer: (d).6.94 ฮผV
Q53.
A directional microphone gives an output of 0.5 mV whereas an omnidirectional one gives an output of 0.5 ฮผV in the same position for the same sound pressure. The directivity of the directional microphone is
Discuss
Answer: (c).60 dB
Q54.
If Eb, the energy per bit of a binary digital signal is 10โ€พโถ watt sec. and the one sided power spectral density of the white noise N0 = 10โ€พโต W/Hz, then the output SNR of the matched filter is
Discuss
Answer: (d).13 dB
Q55.
Consider the following statements about Rhombic antenna

1. It is non resonant
2. It is a broad band antenna
3. It is ideally suited for HF transmission

Which of the above are correct?
Discuss
Answer: (a).1, 2, 3
Q56.
Assertion (A): A composite video signal has synchronising pulses.

Reason (R): It is necessary to synchronise the scanning process in the transmitter and receiver.
Discuss
Answer: (a).Both A and R are correct and R is correct explanation of A
Q57.
Noise with uniform power spectral density of Nโ‚€ฯ‰/Hz is passed through a filter H(ฯ‰) = 2 exp (-J ฯ‰ ty) followed by an ideal low pass filter of bandwidth B Hz. The output noise power in watts is
Discuss
Answer: (b).4 Nโ‚€B
Q58.
Assertion (A): In standing wave pattern, the nodes and anti nodes are separated by half wave-length

Reason (R): When line is terminated in resistance RL, the standing wave ratio is SWR = Z0/RL or RL/Z0
Discuss
Answer: (b).Both A and R are correct but R is not correct explanation of A
Q59.
An amplifier has an input resistance of 10 kฮฉ and the noise voltage is 10 ฮผV. If two such resistances of 10 kฮฉ each are connected in series at the input, the total noise voltage is about
Discuss
Answer: (c).14.14 ฮผV
Discuss
Answer: (c).a little more than channel width