Electromagnetic Field Thoery - ECE Questions and Answers

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The useful magnetic flux obtainable from any closed surface is

unity

constant

both (a) and (b)

none of the above

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The voltage and current distributions on a grounded λ/4 dipole (Marconi antenna) are similar to those of a half wave dipole in space.

True

False

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The equation ∇ . J = 0 is called

Poisson's equation

Kirchoff's node equation

Continuity equation for static currents

Continuity equation for sampling currents

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It is best to use for coupling a coaxial line to a parallel wire transmission line.

directional Coupler

balun

slotted line

tee

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In H-plane metal plate lens the travelling wave front is

totally retarded

retarded

accelerated

neither accelerated nor retarded

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MUF is depend upon

electron density of the ionospheric layer

11 year sun spot cycle

received frequency by receiver

height of ionospheric layer

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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

transmission efficiency

front to back ratio

loss coefficient

none of the above

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Which of the following is not between F₂ layer and D layer?

E layer

F₁ layer

G region

All of the above

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The radiation pattern of Hertzian dipole in the plane perpendicular to dipole is a

null

circle

figure of eight

none of the above