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Electromagnetic Field Theory

Electromagnetic Field Theory
The critical frequency of ‘F’ layer is greater than 30 MHz.

True
False

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Electromagnetic Field Theory
The radiation pattern of a parabola antenna is

Omnidirectional
A figure of directional
None of these
Highly directional

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Electromagnetic Field Theory
A medium is said to be isotropic when

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

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Electromagnetic Field Theory
A square corner reflector is used in

Radio astronomy
Point to point communication
Tv broadcast
All of these

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Electromagnetic Field Theory
For a linear electromagnetic circuit, which of the following statement is true?

 Field energy is lesser than the co-energy.
 Co-energy is zero.
 Field energy is greater than the co-energy.
 Field energy is equal to the co-energy.

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Electromagnetic Field Theory
The magnetic field required to reduce the residual magnetism to zero is called

 Hysteresis.
 Coercivity.
 Retentivity.
 Saturation magnetism.

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MORE MCQ ON Electromagnetic Field Theory

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