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Electromagnetic Field Theory

Electromagnetic Field Theory
A loop antenna is a commonly used for

Radar
All of these
Direction finding
Satellite communication

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Electromagnetic Field Theory
Which of the following is multiband HF receiving antenna?

Square loop
Log-periodic
Conical horn
Folded dipole

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Electromagnetic Field Theory
A Yagi antenna has a driven antenna

With a reflector
Only
With one or more directors
With a reflector and one or more directors

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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.
 PR/d.
 PR/d2.
 Zero.

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Electromagnetic Field Theory
For DC voltage an inductor is virtually a

 short circuit.
 depends on polarity.
 open circuit.
 depends on magnitude of voltage.

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Electromagnetic Field Theory
The virtual height of an ionospheric layer is __________ true height

No relation
Less than
Equal to
Higher than

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MORE MCQ ON Electromagnetic Field Theory

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