Q. The essential condition for antenna array to be linear is that

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Q. Directivity gain depends on

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

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Q. The secondary lobes in binomial arrays can be reduced by

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Q. Which of the following statement is incorrect?

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Q. The maximum effective aperture of a microwave antenna which has a directivity of 900, will be

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Q. For a wave propagating in air filled rectangular waveguide.

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Q. Which of following antenna produces elliptical polarisation?

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Q. The troposphere extends from earth surface to a height of

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Q. Antenna reciprocity is put to use in

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Q. For satellite communication, the frequency should be

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Q. A plane EM wave is travelling in an unbound loss less dielectric having μy = 1 and εy = 4, the time average Poynting vector of the wave is 5 W/m³ . The phase velocity vp (assuming velocity of light as 3 x 10⁸ m/sec) is

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Q. The phase velocity in a coaxial line is

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Q. D-layer extends approximately from

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Q. The ionosphere plays a significant role in radio wave propagation at

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Q. Radiation resistance for wire antenna is

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Q. When a coil consisting of single turn rotates at a uniform speed in a magnetic field, the induced e.m.f. is

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Q. Short-circuited stubs are used, because open-circuited stubs are

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Q. Directivity and beamwidth is related as

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Q. An arrangement of several individual antennas to spaced and phased that their individual contributions combine in one preferred direction and cancel in all other directions, to get greater directive gain or directivity, is known as

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