78201. The INTELSAT-IV satellite launched in 1974 had two earth coverage antenna and two narrower-angle antennas subtending 4.5°. The signal from narrow-angle antenna was stronger than that from earth- coverage antenna by a factor of
78202. A transponder is a satellite equipment which
78203. A geosynchronous satellite
78204. To make antenna more directional, either its size must be increased or
78205. India's first domestic geostationary satellite 1NSAT-IA was launched on 10th April 1982 from
78206. Satellite launch sites are invariably located on Eastern seaboards to ensure that
78207. 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.
78208. The number of days when Earth's shadow falls on a geosynchronous satellite is
78209. Of the four INSAT-I satellites planned by India so for, only __________ has proved to be successful.
78210. Radio broadcasting is a familiar example of
78211. As compared to 17.34° antenna, the total increase in the signal relayed by 4.5° antenna of INTELSAT-IV is
78212. Which one of the following statements regarding DSI is wrong?
78213. Which one of the following statements regarding compandor is FALSE?
78214. The quality of a space-link is measured in terms of the __________ ratio.
78215. The useful operational life of INSAT-IB (launched in 1983) is expected to end by
78216. At present, the radio-frequency band mainly used by most satellites is
78217. Orbital disturbances of a geosynchronous satellite are caused by the
78218. Ball bearing can be removed by using:
78219. In a stop-and-wait ARQ system, the transmitting terminal
78220. A geostationary satellite is one which
78221. The geostationary communication satellite APPLE is parked in the equatorial orbit at
78222. Power received from Sun per m2 surface area of a geosynchronous satellite in nearly __________ watt.
78223. A certain sound has 10000 times more energy than another sound. The number of times it would sound stronger to a listener is
78224. 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 increases by a factor of
78225. A communication satellite is a repeater between
78226. The ending part of the popular teleserial Mahabharat will be beamed to the viewers
78227. The most effective anti jamming technique is
78228. For satellite communication, standard Earth stations have antenna diameters in the range of __________ metre.
78229. The Sun blots out the transmission of a geosynchronous satellite twice a year when satellite passes directly in front of it. This outage lasts for about
78230. In satellite communication, frequency modulation is used because satellite channel has
78231. In the case of a 70-MHz IF carrier for a transponder bandwidth of 36 MHz, energy must lie between MHz.
78232. Which of the following factor does NOT contribute to the drift of a geostationary satellite from its stationary position in space?
78233. In communication satellites, the up-link normally operates at a higher frequency than the down-link because it
78234. For global communication, the number of satellites needed is
78235. The noise temperature of sky is about __________ °K.
78236. Assuming earth to be a sphere of radius 6400 km and height of a geosynchronous satellite above Earth as 36000 km, the velocity of a geosynchronous satellite is __________ km/hr.
78237. In the context of error detection in satellite transmission, ARQ stands for
78238. To cover all inhabited regions of the Earth, the number of geosynchronous communication satellites required
78239. The different access methods which permit many satellite users to operate in parallel through a single transponder without interfering with each other as
78240. When a communication satellite passes into Earth's shadow, its temperature drops to about __________ ° K.
78241. In envelope detection of an AM waveform
78242. Shannon's Law relates
78243. India's first three-axis stabilised geostationary communication satellite is
78244. Point out the false statement.Launching of geostationary experimental communication satellite has helped India to gain experience in
78245. A modem is
78246. In synchronous detection of an AM signal
78247. A typical signal strength received from a geosynchronous communication satellite is of the order of a few
78248. The expression for satellite link frequencies such as 4/6 GHz denotes that
78249. Assuming a minimum angle of elevation of 5°, a geosynchronous satellite remains in line-of-sight for __________ percentage of Earth's surface.
78250. Mark out the WRONG statement.As compared to FDMA, the demand assignment system TDMA
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