Q. A long periodic antenna is a

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Q. The wave in wave guide has

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Q. While determining antenna height for terrestrial microwaves links, the effect of refraction from the atmosphere is taken care of by considering the effective curvature of the earth to be

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Q. A T.V. station works at 300 MHz and radiates 100 kW of power. This signal received at a distance of 200 km will be

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Q. The power gain of a half-wave dipole with respect to an isotropic radiator is

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Q. In an impedance smith chart, a clockwise movement along a constant resistance circle gives rise to

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Q. The relative permittivity of the ionosphere at ratio frequencies is

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Q. Tropospheric scatter propagation is not subject to any fading.

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Q. The attenuation in waveguide above to cut off frequency

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Q. When a current carrying conductor is brought into magnetic field, the force that moves the conductor depends upon

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Q. Due to which of the following reasons a lightning conductor on top of a building is made into a pointed spike?

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Q. The virtual height of an ionospheric layer is __________ true height

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Q. The divergence of a vector is a scalar, while the curl of a vector is another

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Q. An open wire transmission line having a characteristic impedance of 600 ohms is terminated by a resistive load of 900 Ω. The standing wave ratio will be

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Q. The skip distance is the maximum distance upto which ionospheric reflection is possible.

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Q. A transmission line has primary constants R, L, G and C and secondary constant z₀ and γ = (α + Jβ). If the line is loss less, then

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Q. Which of the following is multiband HF receiving antenna?

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Q. A rectangular waveguide is a

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Q. If a and b are the dimensions of waveguide then

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Q. The frequency range for satellite communication is

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