Principle of Communication Engineering – Page 2 – HI MCQ!

Spectral density expresses?

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A Cassegrain reflector antenna has a sub-reflector whose geometrical shape is?

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The radiation resistance of a thin line centre fed antenna with sinusoid current distribution is?

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In an axial mode operation of a helical antenna, maximum field radiated by the antenna is?

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The MODEM is used with a personal computer to do which of the following?

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In an airport, a receiving antenna has a maximum dimension of 3 meters and operates at 100 MHz, An aircraft approaching the airport is 1/2 Km away from the antenna. The aircraft in the …………… region of the antenna.?

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Which one of the following types of noise gains importance at high frequency?

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Shot noise current is directly proportional to?

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Intrinsic impedance of free space is given as?

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For efficient radiation and reception, the transmitting and receiving antennas would have to have comparable to ……………….?

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