402 questions in Principle of Communication Engineering - HI MCQ!

An antenna has maximum radiation intensity Umax = 10 Watt/Sr and average radiation intensity Uavg = 4.5 Watt/Sr. if the efficiency of the antenna is given as nr = 95%, the input power of the antenna is?

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The gain of a parabolic dish antenna of I m diameter and 80 % efficiency at 9.5GHz is?

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A 1mW video signal having a bandwidth of 100MHz is transmitted to a receiver through a cable that has 40dB loss. If the effective one-sided noise spectral density at the receiver is 10-20 Watt/Hz, then signal-to-noise ratio at the receiver is?

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What would be the antenna efficiency for a transmit antenna with a radiation resistance Rr = 25 Ohm and an effective antenna resistance Re=15 ohm?

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In a communication system at 300 MHz, the receiving antenna gain is 8 dBi, the transmitting antenna gain is 10 dBi and the transmitting power level is 25 watts, the distance between the transmitter and the receiver is 1 km, the power received at the receiving antenna port (assuming the propagation medium is loss-less)?

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Which of the following noise must be considered at high frequencies (microwave frequencies)?

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An FM-CW (frequency modulated-continuous Wave) Radar is essentially?

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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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