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 27 of 120

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Q261.
For maximum output the width of air gap of audio head should be

a.

equal to wavelength

b.

half the wavelength

c.

one quarter the wavelength

d.

very small as compared to wavelength

Discuss
Answer: (b).half the wavelength
Q262.
The simplest mixer circuit for public address system uses

a.

fixed resistances

b.

variable resistances

c.

inductances

d.

capacitances

Discuss
Answer: (b).variable resistances
Q263.
PAM stands for

a.

Phase Angle Modulation

b.

Phase Amplitude Modulation

c.

Pulse Amplitude Modulation

d.

Pulse Angle Modulation

Discuss
Answer: (c).Pulse Amplitude Modulation
Q264.
A Discone antenna is

a.

a combination of disk and cone in close approximity

b.

a combination of disk and cone at ฮป/4 spacing

c.

a combination of disk and cone far apart

d.

a combination of disk and cone at ฮป/2 spacing

Discuss
Answer: (a).a combination of disk and cone in close approximity
Q265.
In a two tone AM system the two modulating frequencies are 2000 ฯ€ and 4000 ฯ€ rad/sec. If carrier frequency is 2ฯ€ x 10โถ rad/sec the frequencies of upper sidebands are

a.

1.002 MHz and 1.004 MHz

b.

1.001 MHz and 1.002 MHz

c.

1.001 MHz and 1.004 MHz

d.

1.002 MHz and 1.008 MHz

Discuss
Answer: (b).1.001 MHz and 1.002 MHz
Q266.
For a system to be designated as hi-fi, the signal to noise ratio should be at least

a.

25 dB

b.

50 dB

c.

75 dB

d.

100 dB

Discuss
Answer: (b).50 dB
Q267.
Dolby system of noise reduction divides the total audio spectrum into

a.

8 frequency bands

b.

4 frequency bands

c.

2 frequency bands

d.

none of the above

Discuss
Answer: (b).4 frequency bands
Q268.
In a system an input resistance of 20 kฮฉ causes a noise voltage of 15ฮผV. If two such input resistances each of 20 kฮฉ are used in parallel, the total noise voltage will be about

a.

15 ฮผV

b.

30 ฮผV

c.

7.5 ฮผV

d.

10.6 ฮผV

Discuss
Answer: (d).10.6 ฮผV
Q269.
A sinusoidal signal with peak to peak amplitude of 1.536 volt is quantized into 128 levels using a mid-rise uniform quantizer. The quantization noise power is

a.

0.768 V

b.

48 x 10โ€พโถ V

c.

12 x 10โ€พโถ V

d.

3.072 Volt

Discuss
Answer: (c).12 x 10โ€พโถ V
Q270.
An FM wave is made to pass through a frequency tripler. If original modulation index is mf, the output of tripler has a modulation index equal to

a.

mf

b.

1/3 mf

c.

3 mf

d.

1/9 mf

Discuss
Answer: (c).3 mf
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