ELECTROMAGNETIC FIELD THEORY QUIZ

Which of the following statement regarding waveguides is incorrect?

At frequencies below the cut off value the wave progresses across the waveguide after total reflections

Waveguides can handle large power at UHF and microwaves

At waveguide can be coupled to a coaxial cable

Waveguides are usually air filled hollow conducting metallic tubes for transmitting UHF and microwaves

TRUE ANSWER : ?
YOUR ANSWER : ?

An infinite sheet has a charge density of 150 μ C/m. The flux density in μ C/m 2 is

100.

50.

75.

1/75.

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The virtual height of an ionospheric layer is __________ true height

Equal to

No relation

Higher than

Less than

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The coils having self inductance of 10 mH and 15 mH have an effective inductance of 40 mH, when connected in series aiding. What will be the equivalent inductance if we connect then in series opposing?

20 mH.

5 mH.

10 mH.

0 mH.

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

Field energy is greater than the co-energy.

Co-energy is zero.

Field energy is lesser than the co-energy.

Field energy is equal to the co-energy.

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YOUR ANSWER : ?

The minimum height of outer atmosphere is

100 km

200 km

150 km

400 km

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The skip distance is the maximum distance upto which ionospheric reflection is possible.

False

True

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In above question no. 9, the average force on the core to reduce the air gap will be

3332.47 N.

832.29 N.

1666.22 N.

6664.8 N.

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The magnetic vector potential due to a single conductor carrying current is

infinite.

none of tha above.

zero.

finite.

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What is the value of total electric flux coming out of a closed surface?

Equal to total charge enclosed by the surface.

Equal to the surface charge density.

Equal to volume change density.

Zero.

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