Electromagnetic Field Thoery - ECE Questions and Answers

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Antenna radiation efficiency can be increased by

reducing radiation resistance of the system

increasing radiation resistance of the system

providing effective earthing

any of the above

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Divergence of curl A is

∇ . (∇ x A) = 1

∇ . (∇ x A) = 0

∇ . (∇ x A) = ∇

∇ . (∇ x A) = - ∞

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The energy stored in a magnetic field is given by

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If reflection coefficient is 1/5, then corresponding VSWR is given by

3/2

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The characteristic impedance is given by

Z₀ = Z_oc . Z_sc

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Surface integral of the electric field intensity is

differential of volume flux

electrical charge

net flux emanating from the surface

none of the above

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The essential condition for antenna array to be linear is that

individual antennas of the array must be of equal size

individual antennas of the array must be equally spaced along a straight line

any two individual antennas of the array must not be in the same direction

none of the above

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Directivity gain depends on

the distribution of radiated power in space

solid angle of the radiated field pattern

both (a) and (b)

none of the above

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The fluctuation in the received signal strength at the receiver of a random variation in the received signal is known as

fluctuation

fading

absorption

cycling