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 17 of 63

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Q161.
Which of the following is a vector quantity?

a.

Standing wave ratio

b.

Reflection coefficient

c.

Gain

d.

All of the above

Discuss
Answer: (b).Reflection coefficient
Q162.
Velocity of the wave when it passes from air into sphere

a.

decreases

b.

increases

c.

same

d.

no change

Discuss
Answer: (b).increases
Q163.
The ratio of the directivity of an end fire antenna to that of a broadside antenna is

a.

2

b.

3

c.

4

d.

5

Discuss
Answer: (a).2
Q164.
If the electric field intensity associated with a uniform plane electromagnetic wave travelling in a perfect dielectric medium is given by E(z, t) = 10 cos (2Ο€ x 10⁷t - 0.1 Ο€z) volt/metre, then the velocity of the travelling wave is

a.

3.0 x 10⁸ m/sec

b.

2 x 10⁸ m/sec

c.

6.28 x 10⁷ m/sec

d.

2 x 10⁷ m/sec

Discuss
Answer: (b).2 x 10⁸ m/sec
Q165.
The absorption of radio waves by atmosphere depends on

a.

their frequency

b.

their distance from the transmitter

c.

the polarization of atmosphere

d.

the polarization of the waves

Discuss
Answer: (a).their frequency
Q166.
For transmission-line matching over range of frequencies, it is best to use a

a.

single stub of adjustable position

b.

double stub

c.

broadband directional coupler

d.

balun

Discuss
Answer: (b).double stub
Q167.
For a reflection co-efficient of 0.5, the value of SWR is

a.

-1

b.

1

c.

2

d.

3

Discuss
Answer: (d).3
Q168.
A rectangular waveguide having TE₁₀ mode as dominant mode is having a cut off frequency of 18 GHz for the TE₃₀ mode. The inner broad wall dimension of the rectangular waveguide is

a.

5/3 cm

b.

5 cm

c.

5/2 cm

d.

10 cm

Discuss
Answer: (c).5/2 cm
Q169.
A 50 Ο€ characteristic impedance line is connected to a load which shows a reflection coefficients of 0.268. If Vin = 15 volt, then the net power delivered to the load will be

a.

0.139 W

b.

1.39 W

c.

0.278 W

d.

2.78 W

Discuss
Answer: (b).1.39 W
Q170.
1 dB is equal to __________ nepier

a.

8.6

b.

6.8

c.

8

d.

0

Discuss
Answer: (a).8.6
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