Electromagnetic Field Thoery - ECE Questions and Answers

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A field can be

harmonic

divergence less

solenoidal

rotational

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Phase velocity of waves propagating in a hollow metal waveguide is

greater than the group velocity

less than the velocity of light in free space

equal to the velocity of light in free space

equal to group velocity

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If a plane electromagnetic wave satisfies the equation , the wave propagates in the (at an angle of 45° between the x and z direction)

x-direction

z-direction

y direction

xy plane

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Good smoothing factor of a coil depends on

inductance of the coil

terminal voltage

cross-sectional area of the wire of the coil

property of the wire of the coil

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MUF is given by

f_c sec θ

f_c cos θ

f_c tan θ

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A waveguide behave as

high Pass filter

low Pass filter

band Pass filter

all Pass filter

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Radar antennas are usually

dipoles

yagi antennas

parabolic dishes

none of the above

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The radio horizon for space waves is about three-fourth as for as the optical horizon.

True

False

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Triatics are

small height antenna directly mounted on jeeps, ships, etc.

the towers or masts which are used as radiators

the towers or masts which are not used as radiators

supports for antenna conductors.