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 11 of 63

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Q101.
Find the radiation resistance of an antenna of length λ/10 meter?

a.

8 Ω

b.

780 Ω

c.

7.8 Ω

d.

78 Ω

Discuss
Answer: (c).7.8 Ω
Q102.
A rectangular metal waveguide filled with a dielectric of relative permittivity εr = 4, has the inside dimensions 3 x 1.2 cm, the cut off frequency for the dominant mode is

a.

2.5 GHz

b.

5 GHz

c.

10 GHz

d.

12.5 GHz

Discuss
Answer: (b).5 GHz
Q103.
ZL = 200 Ω and it is desired that Zi = 50 Ω The quarter wave transformer should have a characteristic impedance of

a.

100 Ω

b.

40 Ω

c.

10000 Ω

d.

4 Ω

Discuss
Answer: (a).100 Ω
Q104.
A broadside array consisting of 200 cm wavelength with 10 half-wave dipole spacing 10 cm. And if each array element feeding with 1 amp. current and operating at same frequency then find the half power beamwidth

a.

4°

b.

2°

c.

10°

d.

15°

Discuss
Answer: (b).2°
Q105.
Refractive index of glass is 1.5. Find the wavelength of a beam of light with a frequency of 10¹⁴ Hz in glass. Assume velocity of light is 3 x 10⁸ m/sec in vacuum.

a.

4 μm

b.

3 μm

c.

2 μm

d.

1 μm

Discuss
Answer: (c).2 μm
Q106.
The function f(x - vot) represent which of the following?

a.

A stationary wave

b.

A wave motion in forward direction

c.

A wave motion in reverse direction

d.

None of the above

Discuss
Answer: (b).A wave motion in forward direction
Q107.
A broadside array operating at 100 cm wavelength consist of 4 half-wave dipoles spaced 50 cm apart. Each element carries radio frequency current in the same phase and of magnitude 0.5 A. The radiated power will be

a.

196 W

b.

73 W

c.

36.5 W

d.

18.25 W

Discuss
Answer: (a).196 W
Q108.
A wave is propagated in a waveguide at frequency of 9 GHz and separation is 2 cm between walls Calculate group velocity for dominant mode.

a.

1.8 x 10⁸ m/sec

b.

5 x 10⁸ m/sec

c.

3 x 10⁸ m/sec

d.

1.5 x 10⁸ m/sec

Discuss
Answer: (a).1.8 x 10⁸ m/sec
Q109.
For F1 layer the maximum ionic density is 2.3 x 10⁴ electrons per cc. The critical frequency for this layer will be

a.

1.36 MHz

b.

13.6 MHz

c.

136 MHz

d.

1360 MHz

Discuss
Answer: (b).13.6 MHz
Q110.
The velocity of electromagnetic wave in a good conductor is

a.

3 x 10⁸ m/s

b.

more than 3 x 10⁸ m/s

c.

very low

d.

high

Discuss
Answer: (c).very low
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