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Electronics Engineering Objective Questions { Radar Engineering and Satellite Communication }

134. The owner of a communication satellite is usually required to keep the spacecraft on-station at its assigned place in the geosynchronous orbit with an accuracy of degree.
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135.  In selecting a satellite system, the first determining factor is its
B. antenna size
C. coverage area
D. antenna gain
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136. Which statement out of the following statements is wrong?
A. attenuation of satellite signals by rain and fog varies almost inversely with the angle of elevation
B. at 12/14 GHz link frequencies, signal space a year are in power loss due to rain and fog is much greater than at 4/6 GHz frequencies
C. the distance between satellite and Earth station varies slightly with angle of elevation
D. at present 4/6 GHz geostationary satellites are being parked in geosynchronous orbits at least 100 apart
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137. Which one of the following statement is correct?
A. satellite spacing is not affected by the bandwidth of the transmitting Earth station
B. beam-width in independent of antenna size and frequency band used
C. the width of a beam in space is inversely proportional to the width of the transmitting antenna
D. use of high-frequency bands permits less number of satellites to share the orbit
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138. In communication satellites, the up-link normally operates at a higher frequency than the down-link because
A.it gives a narrow - beam shining into space
B. results in lesser signal attenuation
C. gives better beam-shaping
D. iseasier to polarize a high frequency beam
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139. As compared to 17.340 antenna, the total increase in the signal relayed by 4.5? antenna of INTELSAT-IV is
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140. Power received from Sun per m2 surface area of a geosynchronous satellite is nearly watt
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