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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Q. A very reliable service has to be established between two points on earth separated by 1000 km. The band that will be used as

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Q. A rectangular waveguide (2.29 x 1.02) cm operates at a freq. of 11 GHz in TE₁₀ mode. If the maximum potential gradient of the signal is 5 kV/cm, then the maximum power handling capacity of the waveguide will be

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Q. A parabolic antenna produces a radiation pattern which is

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Q. Considerable ionization occurs between the range

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Q. Gain of isotropic antenna is

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Q. Antenna is a __________ element

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