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 12 of 63

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Q111.
Radiation intensity of a dipole depends strongly on frequency. If at a frequency f, the intensity of radiation is 'I'. Then at a frequency of f/2, the intensity will be

a.

I/2

b.

I/4

c.

I/8

d.

I/16

Discuss
Answer: (a).I/2
Q112.
A material has conductivity of 10¯² mho/m and a relative permittivity of 4. The frequency at which conduction current in the medium is equal to displacement current is

a.

45 MHz

b.

90 MHz

c.

450 MHz

d.

900 MHz

Discuss
Answer: (a).45 MHz
Q113.
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 watt

b.

1 watt

c.

0.1 watt

d.

0.01 watt

Discuss
Answer: (a).10 watt
Q114.
An end fire array consisting of several half-wave lengths of directive gain 40, then find the width of major lobe

a.

60

b.

50

c.

51.25

d.

None of the above

Discuss
Answer: (c).51.25
Q115.
A uniform plane EM wave incident normally on a plane surface of a dielectric material is reflected with a VSWR of 3. What percentage of incident power that is reflected?

a.

10%

b.

25%

c.

50%

d.

75%

Discuss
Answer: (b).25%
Q116.
Poynting vector is associated with which of the following?

a.

Power flow in electromagnetic

b.

Flux in magnetic field

c.

Charge in electrostatic field

d.

Current in electrostatic field

Discuss
Answer: (a).Power flow in electromagnetic
Q117.
Calculate the directivity of a given linear end fire, uniform array of 20 element, each separated by ฮป/3

a.

100

b.

10

c.

26.66

d.

30

Discuss
Answer: (c).26.66
Q118.
For a 400 kHz transmission line having L = 0.5 mH/km, C = 0.08 mF and negligible R and G, the velocity propagation will be

a.

15.8303 km/s

b.

15.830 km/s

c.

1.583 km/s

d.

0.1583 km/s

Discuss
Answer: (a).15.8303 km/s
Q119.
Antenna efficiency of antenna is, if radiation resistance is 370 ฮฉ and loss resistance is 100 ฮฉ

a.

80%

b.

87%

c.

78%

d.

21.27%

Discuss
Answer: (c).78%
Q120.
At a particular time it is observed that the frequencies of F layer at Delhi is 3 MHz the maximum electron density is

a.

11 x 10¹แดผ

b.

1.1 x 10¹แดผ

c.

0.11 x 10¹แดผ

d.

11 x 10¹²

Discuss
Answer: (a).11 x 10¹แดผ
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