ELECTROMAGNETIC FIELD THEORY QUIZ

In a lossless medium the intrinsic impedance η = 60π and μr = 1. The relative dielectric constant εr shall be

1.

2.

4.

8.

TRUE ANSWER : ?
YOUR ANSWER : ?

An emf of 16 volts is induced in a coil of inductance 4 H. The rate of change of current must be

32 A / s.

16 A / s.

4 A / s.

64 A / s.

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YOUR ANSWER : ?

XEROX machine is working on

electrostatic effect.

magnetic effect.

heating effect of current.

peltier effect.

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

Vertical grounded wire type

Any of the above

Horizontal suspended wire type

Parabolic reflector type

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YOUR ANSWER : ?

A coil of 300 turns is wound on a non magnetic core having a mean circumference of 300 mm and a cross sectional area of 300 mm2. The inductance of the coil corresponding to a magnetizing current of 6 A will be

3.768 μH.

1.1304 μH.

113.04 μH.

37.68 μH.

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YOUR ANSWER : ?

A square corner reflector is used in which of the following?

Radio astronomy

Point-to-point communication

TV broadcast

All of these

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Electric field strength of charge

Decrease with square distance.

Increase square distance.

Decrease with distance.

Increase distance.

TRUE ANSWER : ?
YOUR ANSWER : ?

The principle of dynamically induced emf is utilized in a

thermocouple.

generator.

choke.

transformer.

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YOUR ANSWER : ?

For a linear electromagnetic circuit, which of the following statement is true?

Co-energy is zero.

Field energy is greater than the co-energy.

Field energy is lesser than the co-energy.

Field energy is equal to the co-energy.

TRUE ANSWER : ?
YOUR ANSWER : ?

In above problem the induced emf will be reduced to half if the conductor moves an angle of

45° to the direction of field.

75° to the direction of field.

60° to the direction of field.

30° to the direction of field.

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YOUR ANSWER : ?

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