46. Which of the following is the source of energy for a satellite ?
(a) Magneto-hydro generator
(b) Battery
(c) Solar cell
(d) Fuel cell
47. Satellite used for intercontinental communications are known as :
(a) COMSAT
(b) MARISAT
(c) DOMSAT
(d) INTELSAT
48. Total band of frequencies allocated for satellite communications spread over :
(a) 100 MHz
(b) 4 GHz
(c) 6 GHz
(d) None of these
49. Rain attenuation and sky noise is low at :
(a) 4 GHz
(b) 6 GHz
(c) 12 GHz
(d) 14 GHz
50. Microwave links are preferred to coaxial cables for transmission because :
(a) They have less overall distortion
(b) They have greater bandwidths
(c) Of their relative immunity to impulse noise
(d) They are cheaper
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