Electromagnetic Field Thoery - ECE Questions and Answers

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Brewster angle is the angle for which there is

no reflection and the incident wave is vertically polarized

reflection and the incident wave is horizontally polarized

no reflection and the incident wave is horizontally polarized

none of the above

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Surface waves can propagate on Piezoelectric substrates.

True

False

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For an antenna radiation and induction fields are

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A folded dipole antenna is conveniently connected to

shielded line

two wire line

coaxial line

flat ribbon type transmission line

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The "boundary sphere" between antenna region and free space region appears to "opaque"

along the dipole axis

along perpendicular direction

along the dipole axis as well as perpendicular direction

neither along the dipole axis nor along the perpendicular direction

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In a horizontal polarized wave

magnetic field is perpendicular to ground

magnetic field component is parallel to ground

electric field component is perpendicular to ground

electric field is parallel to ground

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For a uniform plane wave of frequency 10⁶ Hz propagating in a good conductor, the field undergoes a change in phase by 2p radius over a distance of 1 meter. The field is attenuated by a factor of 1/e at a distance of

p m

2p m

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T.V. broadcasting based on

line of sight communication

ionospheric propagation

ground wave

medium wave

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Absolute permeability (μ) is given by __________ henry/metre

4p x 10^-12

4p x 10^-7

8.854 x 10^-12

8.854 x 10^-7