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Electromagnetic Field Theory

Electromagnetic Field Theory
A medium is said to be isotropic when

 ∈ = μσ.
 ∈ is zero.
 ∈ = μ.
 ∈ is a scalar constant.

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Electromagnetic Field Theory
Parabolic and lens antenna used at

High frequency
Medium frequency
Microwave frequency
Low frequency

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Electromagnetic Field Theory
The main disadvantage of the two-hole directional coupler is

High standing wave ratio
Low directional coupling
Narrow bandwidth
Poor directivity

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Electromagnetic Field Theory
An electric dipole of moment P is placed in front of a ground sphere. The change induced on the surface of the sphere is (Assume radius of sphere = R and distance from dipole to centre of sphere = d)

 PR 2/d3.
 Zero.
 PR/d2.
 PR/d.

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Electromagnetic Field Theory
The heating time constant of an electrical machine gives an indication of its

 cooling.
 short time rating.
 rating.
 overload capacity.

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Electromagnetic Field Theory
In case of antenna the ratio of the power radiated in the desired direction to the power radiated in the opposite direction is known as

Front to back ratio
None of these
Transmission efficiency
Loss coefficient

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MORE MCQ ON Electromagnetic Field Theory

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