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Electromagnetic Field Theory

Electromagnetic Field Theory
Which of the following impedance inversion is obtained?

A half wave line
A quarter wave line
Balun transformer
Short-circuited stub

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Electromagnetic Field Theory
The two windings of a transformer have an inductor of 2 H each. If mutual inductor between them is also 2 H, then

 none of these.
 transformer is an ideal transformer.
 it is a perfect transformer.
 turns ratio of the transformer is also two.

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Electromagnetic Field Theory
The force on a charge moving with velocity v under the influence of electric and magnetic fields is given by which one of the following

 q(E + B × V).
 q(H + V × E).
 q(E + V × B).
 q(E +V × H).

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Electromagnetic Field Theory
An inductor designed with 400 turns coil wound on an iron core of 16 cm2 cross sectional area and with a cut of air gap length of 1 mm. The coil is connected to a 230 V, 50 Hz supply. Neglected coil resistance, core loss, iron reluctance and leakage inductance. Find the current in the inductor.

 4.56 A.
 18.08 A.
 9.04 A.
 2.28 A.

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Electromagnetic Field Theory
Conductor is constant and field is varying then emf will be induced. This principle is called

 static induced emf.
 dynamically induced emf.
 virtually induced emf.
None of these

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Electromagnetic Field Theory
The main purpose of choke is

 to block low frequencies.
 to pass high frequencies.
 none of above.
  to pass low frequencies.

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