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 10 of 63

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Q91.
The electric field on the surface of a perfect conductor is 2V/m. The conductor is immersed in water with ε = 80 ε0. The surface charge density on the conductor is ((ε0 = 10¯⁹/36π)F/m)

a.

0 c/m²

b.

2 c/m²

c.

1.8 x 10¯¹¹ c/m²

d.

1.14 x 10¯⁹ c/m²

Discuss
Answer: (d).1.14 x 10¯⁹ c/m²
Q92.
A wave is propagated in a waveguide at frequency of 9 GHz and separation is 2 cm between walls calculate the phase velocity for dominant mode.

a.

3 x 10⁸ m/sec

b.

5 x 10⁸ m/sec

c.

1.5 x 10⁸ m/sec

d.

9 x 10⁸ m/sec

Discuss
Answer: (b).5 x 10⁸ m/sec
Q93.
A plane electromagnetic wave travels in dielectric medium of relative permittivity 9. Relative to free space, the velocity of propagation in the dielectric is

a.

increased by a factor of 9

b.

increased by a factor of 3

c.

unchanged

d.

reduced by a factor of 1/3

Discuss
Answer: (d).reduced by a factor of 1/3
Q94.
Calculate the wave impedance for TM mode in rectangular waveguide for dominant mode at 3 GHz having

a.

(120π) Ω

b.

377 Ω

c.

226 Ω

d.

629 Ω

Discuss
Answer: (c).226 Ω
Q95.
The divergence of the electric field intensity at any point equals

a.

1/4 πε₀ times the volume charge density

b.

l/ε₀ times the volume charge density at that point

c.

ε₀ times the volume charge density at that point

d.

the volume charge density at that point

Discuss
Answer: (b).l/ε₀ times the volume charge density at that point
Q96.
For a 400 kHz transmission line having L = 0.5 mH/km, C = 0.08 mF and negligible R and G, the value of propagation constant P will be

a.

15.9 radians/km

b.

31.8 radians/km

c.

63.6 radians/km

d.

105.4 radians/km

Discuss
Answer: (a).15.9 radians/km
Q97.
The Depth of penetration of EM wave in medium having conductivity σ at a frequency of 1 MHz is 25 cm. The depth of penetration at a frequency of 4 MHz will be

a.

6.25 cm

b.

12.50 cm

c.

50 cm

d.

100 cm

Discuss
Answer: (b).12.50 cm
Q98.
What is the characteristic impedance at 10 MHz?

a.

547.7 Ω

b.

54.7 Ω

c.

5.47 Ω

d.

.547 Ω

Discuss
Answer: (a).547.7 Ω
Q99.
The input impedance of short-circuited line of length l where λ/4 < l < λ/2, is

a.

resistive

b.

inductive

c.

capacitive

d.

none of the above

Discuss
Answer: (c).capacitive
Q100.
A wave is propagated in a waveguide at frequency of 9 GHz and separation is 2 cm between walls find cut off wavelength for dominant mode.

a.

4 cm

b.

1 cm

c.

2 cm

d.

8 cm

Discuss
Answer: (a).4 cm
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