Electromagnetic Field Theory MCQs

Welcome to our comprehensive collection of Multiple Choice Questions (MCQs) on Electromagnetic Field Theory, 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 Electromagnetic Field Theory 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 Electromagnetic Field Theory mcq questions that explore various aspects of Electromagnetic Field Theory problems. Each MCQ is crafted to challenge your understanding of Electromagnetic Field Theory 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 Electromagnetic Field Theory 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 Electromagnetic Field Theory. 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 Electromagnetic Field Theory knowledge to the test? Let's get started with our carefully curated MCQs!

Electromagnetic Field Theory MCQs | Page 8 of 63

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Q71.
Which one set of the following Maxwell's equation gives the basic idea of radiation ?

a.

A

b.

B

c.

C

d.

D

Discuss
Answer: (a).A
Q72.
Power gain and directivity related with, Gp power gain, Gd directive gain

a.

A

b.

B

c.

C

d.

D

Discuss
Answer: (a).A
Q73.
The number of free electrons in acceptor atom is

a.

1

b.

2

c.

3

d.

4

Discuss
Answer: (c).3
Q74.
Consider a loss less antenna with a directive gain of + 6 dB. If 1 mW of power is fed to it the total power radiated by the antenna will be

a.

4 mW

b.

1 mW

c.

7 mW

d.

1/4 mW

Discuss
Answer: (a).4 mW
Q75.
Which of the following should dominant wave have?

a.

Lowest cut off frequency

b.

Highest cut off frequency

c.

No attenuation

d.

No phase shift

Discuss
Answer: (a).Lowest cut off frequency
Q76.
Find the noise factor for an antenna at 27°C with equivalent noise temperature 30°K

a.

20

b.

100

c.

300

d.

1.1

Discuss
Answer: (d).1.1
Q77.
The displacement flux density at a point on the surface of a perfect conductor is D = 2(ax - โˆš3 az)c/m² pointing away from the surface. The charge density at that point c/m² will be

a.

2

b.

- 2

c.

4

d.

- 4

Discuss
Answer: (c).4
Q78.
Characteristic impedance of a transmission line is 50 ฮฉ. Input impedance of the open circuited line. Zoc = 100 + J150 ฮฉ. When transmission line is short circuited, then value of the input impedance will be

a.

50 ฮฉ

b.

100 + J150 ฮฉ

c.

7.69 + J11.54ฮฉ

d.

7.69 - J11.54 ฮฉ

Discuss
Answer: (d).7.69 - J11.54 ฮฉ
Q79.
A transmission line is feeding 1 watt of power to a horn antenna having a gain of 10 dB. The antenna is matched to the transmission line. The total power radiated by the horn antenna into the free space is

a.

10 watts

b.

1 watt

c.

0.1 watt

d.

0.01 watt

Discuss
Answer: (a).10 watts
Q80.
A parallel polarized wave is incident from air into paraffin having relative permittivity 3, the value of its Brewster angle is

a.

0°

b.

30°

c.

45°

d.

60°

Discuss
Answer: (d).60°
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