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Electromagnetic Field Theory

Electromagnetic Field Theory
MUF is highest in periods of greatest sunspot activity.

False
True

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

2.15 db
4.15 db
3 db
6 db

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Electromagnetic Field Theory
A voltage waveform V(t) = 12t2 is applied across a 1H inductor for t = 0, with initial current through it being zero. The current through the inductor for t = 0 is given by

 12t.
 24t.
 12t3.
 4t3.

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Electromagnetic Field Theory
The transmitting antennas for lower frequencies (below 500 kHz) are generally

Parabolic reflector type
Any of the above
Vertical grounded wire type
Horizontal suspended wire type

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Electromagnetic Field Theory
Which of following is the unit of inductance?

 Ohm.
  Ampere turns.
  Milli- henry.
  Webers / m.

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

 Hysteresis.
 Retentivity.
 Coercivity.
 Saturation magnetism.

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MORE MCQ ON Electromagnetic Field Theory

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