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Electromagnetic Field Theory

Electromagnetic Field Theory
If the static magnetic flux density is B, then

 Curl of B = J.
 Curl of B = 0.
 Divergence of B = J.
  Divergence of B = 0.

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

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

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Electromagnetic Field Theory
In case of surface waves the field strength at a point is directly proportional to

Current of the antenna
Wave frequency
Distance of the point from the antenna
Antenna height

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

 rating.
 overload capacity.
 short time rating.
 cooling.

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Electromagnetic Field Theory
It is best to use for coupling a coaxial line to a parallel wire transmission line.

Balun
Directional Coupler
Slotted line
Tee

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Electromagnetic Field Theory
The minimum height of outer atmosphere is

200 km
100 km
150 km
400 km

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MORE MCQ ON Electromagnetic Field Theory

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