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 62 of 63

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Q611.
It is desired to reduce the reflection at an air porcelain by use of 7/4 plate (for Porcelain μ = 40, and εr = 7). The thickness of the polystyrene plate required at 10 GHz will be

a.

5.039 cm

b.

50.39 cm

c.

0.5039 cm

d.

0.05039 cm

Discuss
Answer: (c).0.5039 cm
Q612.
Which of the following statement is false?

a.

A half-wave dipole is a resonant antenna

b.

A horizontal antenna transmits radio signal with horizontal polarization

c.

The field strength of 200 mV/m will produced 200 μV of signal in an antenna 2 m long

d.

All of the above

Discuss
Answer: (c).The field strength of 200 mV/m will produced 200 μV of signal in an antenna 2 m long
Q613.
The useful magnetic flux obtainable from any closed surface is

a.

unity

b.

constant

c.

both (a) and (b)

d.

none of the above

Discuss
Answer: (d).none of the above
Q614.
The voltage and current distributions on a grounded λ/4 dipole (Marconi antenna) are similar to those of a half wave dipole in space.

a.

True

b.

False

c.

May be True or False

d.

Can't say

Discuss
Answer: (a).True
Q615.
The equation ∇ . J = 0 is called

a.

Poisson's equation

b.

Kirchoff's node equation

c.

Continuity equation for static currents

d.

Continuity equation for sampling currents

Discuss
Answer: (c).Continuity equation for static currents
Q616.
The capacitance between two spheres, whose separation is very much larger than their radii R, is given approximately as

a.

2π/ε₀R

b.

2πε₀R

c.

2πε₀/R

d.

none of the above

Discuss
Answer: (b).2πε₀R
Q617.
If ωε is the displacement current factor and s is conduction current density factor then which of the following statements is incorrect?

a.

For a lossless dielectric σ = 0

b.

For an imperfect dielectric σ = 0

c.

For a dielectric ωε >> σ

d.

For a semiconductor ωε = σ

Discuss
Answer: (b).For an imperfect dielectric σ = 0
Q618.
Parabolic and lens antenna used at

a.

microwave frequency

b.

medium frequency

c.

low frequency

d.

high frequency

Discuss
Answer: (a).microwave frequency
Q619.
Which of the following statement regarding waveguides is incorrect?

a.

At waveguide can be coupled to a coaxial cable

b.

At frequencies below the cut off value the wave progresses across the waveguide after total reflections

c.

Waveguides are usually air filled hollow conducting metallic tubes for transmitting UHF and microwaves

d.

Waveguides can handle large power at UHF and microwaves

Discuss
Answer: (a).At waveguide can be coupled to a coaxial cable
Q620.
The potential that appears at a point in space due to the current which caused it is called potential

a.

accelerating

b.

retardation

c.

oscillating

d.

lagging the current

Discuss
Answer: (b).retardation
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