Q. A time varying magnetic field produces

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Q. Surface integral of the electric field intensity is

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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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