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 19 of 63

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Q181.
An end fire array consisting of several half-wave lengths of directive gain 40, then Find width of major lobe for broadside

a.

6°

b.

5.73

c.

51.25

d.

0°

Discuss
Answer: (b).5.73
Q182.
Distilled water at 25°C is characterized by ฯƒ = 1.7 x 10¯โด mho/m and ฮต = 78 ฮตโ‚€ at a frequency of 3 GHz. Its loss tangent is (ฮต = 10¯โน/36ฯ€ F/m)

a.

1.3 x 10¯โต

b.

1.3 x 10¯³

c.

1.7 x 10¯โด/78

d.

1.7 x 10¯โด/78ฮตโ‚€

Discuss
Answer: (a).1.3 x 10¯โต
Q183.
The input impedance of short-circuited line of length l where l < ฮป/4

a.

inductive

b.

capacitive

c.

resistive

d.

none of the above

Discuss
Answer: (a).inductive
Q184.
If the height of transmitting and receiving antenna in a LOS system are 49 meter and a 9 meter respectively then the distance up to which communication may be possible is about

a.

40 km

b.

110 km

c.

400 km

d.

1100 km

Discuss
Answer: (a).40 km
Q185.
In a line VSWR of a load is 6 dB. The reflection coefficient will be

a.

0.033

b.

0.33

c.

0.66

d.

3.3

Discuss
Answer: (c).0.66
Q186.
The refractive index of E layer at frequency of โˆš(81N)

a.

0

b.

โˆž

c.

1

d.

0.5

Discuss
Answer: (a).0
Q187.
A wavelength of 1 mm could be expected in

a.

VLF

b.

HF

c.

EHF

d.

SHF

Discuss
Answer: (c).EHF
Q188.
The numerical value of directivity of current element of half-wave dipole is 1.76 and 2.15 dB respectively. The directive gain of half-wave dipole over current element will be

a.

3.91 dB

b.

1.95 dB

c.

0.39 dB

d.

0.195 dB

Discuss
Answer: (c).0.39 dB
Q189.
The maximum effective aperture of an antenna which is operating at wavelength of 2 m and has directivity of 100 is

a.

15.92

b.

31.84

c.

2.18

d.

3.184

Discuss
Answer: (d).3.184
Q190.
The waveguides compared to equivalent transmission lines at low frequency are

a.

able to carry more power

b.

less noisy

c.

having lower attenuation

d.

all of the above

Discuss
Answer: (d).all of the above
Page 19 of 63