Q. Which of the following frequencies cannot be used for reliable beyond-the-horizon terrestrial communications without repeaters?

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Q. Maximum effective aperture (Ae)max of short dipole antenna is

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Q. Beamwidth of an antenna depends upon

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Q. The term critical frequency denotes

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Q. The important postulate arising out of Maxwell's modification of Ampere's law is

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Q. Which of the following is not a wideband antenna?

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Q. The polarization phenomena in Faraday rotation

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

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Q. In a horizontal polarized wave

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

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Q. T.V. broadcasting based on

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

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Q. In a rectangular waveguide ZTE . ZTM is

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Q. Brewster angle is the angle for which there is

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Q. Surface waves can propagate on Piezoelectric substrates.

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Q. For an antenna radiation and induction fields are

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Q. A folded dipole antenna is conveniently connected to

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Q. Radiation resistance of half-wave dipole (λ/2) antenna is in free space

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Q. The effect of the inductance of a coil on a constant direct current is that

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Q. The ratio of tangential component of electric field at the surface of a conductor and the linear current density resulting from this field is __________ impedance

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