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Electromagnetic Field Theory

Electromagnetic Field Theory
The power gain of a half-wave dipole with respect to an isotropic radiator is

3 db
4.15 db
6 db
2.15 db

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Electromagnetic Field Theory
Which of the following will increase the antenna radiation efficiency?

Any of the above
Top loading of antenna
Providing insulation on conductor
Use of larger section of conductor

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Electromagnetic Field Theory
As a result of reflection from a plane conducting wall, electromagnetic waves acquire an apparent velocity greater than the velocity of light in space. This is called the

 velocity of propagation.
 phase velocity.
 group velocity.
 normal velocity.

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Electromagnetic Field Theory
A conductor is rotating with in a magnetic field. At which of the positions do the peak voltages occur?

 Anywhere.
 At right angles to the axis of the magnetic field.
 At an angle of 45° to the axis of the magnetic field.
 Along the axis of the magnetic field.

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Electromagnetic Field Theory
How much current must flow in a loop of radius 1m to produce a magnetic field of 1 mA/m?

 1.5 mA.
 2.5 mA.
 2 mA.
 1mA.

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Electromagnetic Field Theory
If the resistance of a conductor does not vary in accordance with the Ohms law it is known as

 reverse conductor.
 non - conductor.
 non - linear conductor.
 bad conductor.

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MORE MCQ ON Electromagnetic Field Theory

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