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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

4.15 db
3 db
6 db
2.15 db

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Electromagnetic Field Theory
The property of the coil by which a counter emf is induced in it when the current through the coil changes is known as

 series aiding inductance.
 capacitance.
 mutual inductance.
 self inductance.

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Electromagnetic Field Theory
The hysteresis loop of a magnetic material has an area of 5 cm2 with the scale given as 1 cm = 2 AT and 1 cm = 50 mwb At 50 Hz; the total hysteresis loss is

  25 W.
 20 W.
 50 W.
 15 W.

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Electromagnetic Field Theory
A loop antenna is a commonly used for

Satellite communication
Direction finding
Radar
All of these

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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

 12t3.
 12t.
 4t3.
 24t.

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Electromagnetic Field Theory
The radiation pattern of a parabola antenna is

None of these
Highly directional
A figure of directional
Omnidirectional

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MORE MCQ ON Electromagnetic Field Theory

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