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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Q. Laplacian of a scalar function v is

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Q. The numerical value of directive gain may lie between

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Q. The wave propagation occurs without attenuation in case of a

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Q. When the phase velocity of an EM wave depends on frequency in any medium, the phenomenon is called

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Q. A hertzian dipole has a radiation pattern with

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Q. Circular polarized waves result when

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