Electromagnetic Field Theory - Part 1 Online Exam Quiz

Electromagnetic Field Theory - Part 1 GK Quiz. Question and Answers related to Electromagnetic Field Theory - Part 1. MCQ (Multiple Choice Questions with answers about Electromagnetic Field Theory - Part 1

Z L = 200 ? and it is desired that Z i = 50 ? The quarter wave transformer should have a characteristic impedance of

Options

A : 100 ?

B : 40 ?

C : 10000 ?

D : 4 ?

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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

Options

A : 4°

B : 2°

C : 10°

D : 15°

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Refractive index of glass is 1.5. Find the wavelength of a beam of light with a frequency of 10 14 Hz in glass. Assume velocity of light is 3 x 10 8 m/sec in vacuum.

Options

A : 4 ?m

B : 3 ?m

C : 2 ?m

D : 1 ?m

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The function f ( x - v ot ) represent which of the following?

Options

A : A stationary wave

B : A wave motion in forward direction

C : A wave motion in reverse direction

D : None of the above

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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

Options

A : 196 W

B : 73 W

C : 36.5 W

D : 18.25 W

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The input impedance of short-circuited line of length l where ?/4 < l < ?/2, is

Options

A : resistive

B : inductive

C : capacitive

D : none of the above

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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.

Options

A : 4 cm

B : 1 cm

C : 2 cm

D : 8 cm

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

Options

A : 8 ?

B : 780 ?

C : 7.8 ?

D : 78 ?

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Charge needed within a unit sphere centred at the origin for producing a potential field,

Options

A : 12 p c

B : 60 p c

C : 120 p c

D : 180 p c

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A rectangular metal waveguide filled with a dielectric of relative permittivity ? r = 4, has the inside dimensions 3 x 1.2 cm, the cut off frequency for the dominant mode is

Options

A : 2.5 GHz

B : 5 GHz

C : 10 GHz

D : 12.5 GHz

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