Q. In a medium if ε, μ and σ are constant throughout the medium, then it is known as

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Q. The directivity of 20 turn helix having α = 12° circumference equal to one wavelength, will be

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Q. The velocity factor of a transmission line

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Q. For TM waves in a parallel plate waveguide, the minimum attenuation arising from imperfect conductors would occur at a freq. of (fc is the cut off frequency)

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Q. __________ acts as a depolarizer in a dry cell.

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Q. Tropospheric mode of propagation is used in

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Q. The skip distance is

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Q. Polystyrene has a relative permittivity of 2.7. If the wave is incident at an angle θi of 30° from air into polystyrene, the angle of transmission will be nearly

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Q. For frequency up to 1650 kHz, the transmitting antenna is used a

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Q. Radar antennas are

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Q. Which of the following is high frequency transmission line?

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Q. Which of the following are the properties of a medium?

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Q. In microwave communication, some times, microwave signals reach large distances by following the earth curvature. This phenomenon is called

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Q. There is no radiation at right angles to the plane of the array, is end fire array.

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Q. Which of the following constitute the loss resistance of an antenna?

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Q. The M.K.S. unit of magnetic field intensity is

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Q. The portion of the atmosphere closest to ground is called ionosphere.

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Q. Which of the following relations is valid for a spherical surface?

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Q. When there is rapid attenuation of field inside the conductor, the field current are concentrated close to the surface of the conductor; this phenomenon is called

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Q. Which antenna is frequently used for local area transmission at UHF/VHF?

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