ELECTROMAGNETIC FIELD THEORY QUIZ

In case of antenna the ratio of the power radiated in the desired direction to the power radiated in the opposite direction is known as

Front to back ratio

Loss coefficient

None of these

Transmission efficiency

TRUE ANSWER : ?
YOUR ANSWER : ?

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

Co-energy is zero.

Field energy is equal to the co-energy.

Field energy is lesser than the co-energy.

Field energy is greater than the co-energy.

TRUE ANSWER : ?
YOUR ANSWER : ?

In an inductor current cannot change abruptly. Comment on the statement.

False.

True.

Cannot comment.

True partially.

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YOUR ANSWER : ?

Electric field intensity (E) at ant point in an electric field is equal to

(potential gradient)1/3.

potential gradient.

(potential gradient)1/2.

(potential gradient)2.

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YOUR ANSWER : ?

The principle of dynamically induced emf is utilized in a

thermocouple.

generator.

transformer.

choke.

TRUE ANSWER : ?
YOUR ANSWER : ?

The wave in wave guide has

Group velocity inversely proportional to wavelength

Larger frequency than in the free space

Diminishing wavelength than in the free space

Larger wavelength than in the free space

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YOUR ANSWER : ?

A metal surface with 1 meter radius and surface charge density of 20 coulombs / m2 is enclosed in a 10 m side cube. The total outward electric displacement normal to the surface of the cube is

80π coulombs.

none of these.

40π coulombs.

10π coulombs.

TRUE ANSWER : ?
YOUR ANSWER : ?

inductance (L2) in parallel without mutual coupling will be

20 mH.

15 mH.

10 mH.

5 mH.

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A satellite that simply reflect back the signals from one region of the earth to the other region is known as

Active satellite

Passive satellite

Geostationary satellite

Orbiting satellite

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Which antenna is a wideband antenna?

Marconi antenna

Hertz antenna

None of these

Folded dipole

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YOUR ANSWER : ?

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