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Electronics and Communication Engineering - Electromagnetic Field Theory

Why Electronics and Communication Engineering Electromagnetic Field Theory?

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Home » Engineering » Electronics and Communication Engineering » Electromagnetic Field Theory » Section 1

Exercise :: Electromagnetic Field Theory - Section 1

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

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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. 4°
B. 2°
C. 10°
D. 15°

Answer: Option B

Explanation:

.

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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.

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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.

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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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