148. To make an antenna more directional, either its size must be increased or
A. the number of its feed horns must be increased
B. the frequency of its transmission must be increased
C. its effective isotropic radiated power (EIRP) must be increased
D. its footprint must be increased

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149. Shannon's Law relates
A. antenna gain to frequency
B. noise power to bandwidth
C. information carrying capacity to S/N ratio
D. transmission losses to noise

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150. Noise temperature of Sun is more than
A.1000
B.5000
C.1,00,000
D.500

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151. The noise temperature of sky is about ?K
A.100
B.273
C.0
D.30

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152. The average noise temperature of Earth, as viewed from space, is
A.254
B.303
C.100
D.500

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153. While keeping the down-link frequency constant, the diameter of a satellite antenna is reduced by half. To offer the same EIRP over the increased coverage area, the RF output power has to be increased by a factor of
A.2
B.4
C.8
D.16

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154. The quality of a space-link is measured in terms of the ratio.
A. C/N
B. Snsl
C.G/T
D. EIRP

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