Electronics and Communication Engineering - Electromagnetic Field Theory

Why Electronics and Communication Engineering Electromagnetic Field Theory?

In this section you can learn and practice Electronics and Communication Engineering Questions based on "Electromagnetic Field Theory" and improve your skills in order to face the interview, competitive examination and various entrance test (CAT, GATE, GRE, MAT, Bank Exam, Railway Exam etc.) with full confidence.

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Where can I get Electronics and Communication Engineering Electromagnetic Field Theory Interview Questions and Answers (objective type, multiple choice)?

Here you can find objective type Electronics and Communication Engineering Electromagnetic Field Theory questions and answers for interview and entrance examination. Multiple choice and true or false type questions are also provided.

How to solve Electronics and Communication Engineering Electromagnetic Field Theory problems?

You can easily solve all kind of Electronics and Communication Engineering questions based on Electromagnetic Field Theory by practicing the objective type exercises given below, also get shortcut methods to solve Electronics and Communication Engineering Electromagnetic Field Theory problems.

1. 

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

Answer: Option A

Explanation:

Z0 = Zi . ZL


2. 

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.
B.
C. 10°
D. 15°

Answer: Option B

Explanation:

.


3. 

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

Answer: Option C

Explanation:

Given, μ = 1.6, f = 1014 Hz, v = 3 x 108 m/sec.


4. 

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

Answer: Option B

Explanation:

f(x - vot) represents in +ve direction while f(x + vot) represents a progressive wave in -ve direction.


5. 

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

Answer: Option A

Explanation:

P = n . I2 . Rr, where Rr = 80p2 Ω.

n = 4.


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