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 56 of 63

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Q551.
While determining antenna height for terrestrial microwaves links, the effect of refraction from the atmosphere is taken care of by considering the effective curvature of the earth to be

a.

2/3 times the radius of the earth (Re)

b.

3/4 Re

c.

4/3 Re

d.

3/2 Re

Discuss
Answer: (c).4/3 Re
Q552.
A T.V. station works at 300 MHz and radiates 100 kW of power. This signal received at a distance of 200 km will be

a.

a few ฮผV/m due to attenuation by atmosphere

b.

1-5 mV due to ionospheric reflection

c.

nil since propagation is line of sight

d.

nil because signal fades completely at 300 MHz

Discuss
Answer: (c).nil since propagation is line of sight
Q553.
The power gain of a half-wave dipole with respect to an isotropic radiator is

a.

2.15 db

b.

3 db

c.

4.15 db

d.

6 db

Discuss
Answer: (a).2.15 db
Q554.
In an impedance smith chart, a clockwise movement along a constant resistance circle gives rise to

a.

decrease in the value of reactance

b.

an increase in the value of reactance

c.

no change in the reactance value

d.

no change in the impedance value

Discuss
Answer: (b).an increase in the value of reactance
Q555.
The relative permittivity of the ionosphere at ratio frequencies is

a.

> 1

b.

< 1

c.

=1

d.

โ‰ฅ 1

Discuss
Answer: (b).< 1
Q556.
Tropospheric scatter propagation is not subject to any fading.

a.

True

b.

False

c.

May be True or False

d.

Can't say

Discuss
Answer: (b).False
Q557.
The attenuation in waveguide above to cut off frequency

a.

very high

b.

very low

c.

zero

d.

infinite

Discuss
Answer: (b).very low
Q558.
When a current carrying conductor is brought into magnetic field, the force that moves the conductor depends upon

a.

the value of current

b.

the weight of the conductor

c.

the direction of the conductor

d.

none of the above

Discuss
Answer: (a).the value of current
Q559.
Due to which of the following reasons a lightning conductor on top of a building is made into a pointed spike?

a.

Dust particles may not accumulate

b.

Charge per unit area becomes very high for lightening to discharge

c.

Rain drops may not collect

d.

None of the above

Discuss
Answer: (b).Charge per unit area becomes very high for lightening to discharge
Q560.
The virtual height of an ionospheric layer is __________ true height

a.

equal to

b.

less than

c.

higher than

d.

no relation

Discuss
Answer: (c).higher than
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