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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Q. Tropospheric scatter is used with frequencies in the

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Q. A Yagi antenna has a driven antenna

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Q. The minimum height of outer atmosphere is

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Q. An electric charge Q is placed in a dielectric medium which of the following quantities are independent of the dielectric constant ε of the medium

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Q. A square corner reflector is used in

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Q. A square corner reflector is used in which of the following?

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