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You Are On Multi Choice Question Bank SET 1297

64851. Which one of the following statements regarding compandor is FALSE?





64852. The quality of a space-link is measured in terms of the __________ ratio.





64853. The useful operational life of INSAT-IB (launched in 1983) is expected to end by





64854. At present, the radio-frequency band mainly used by most satellites is





64855. Orbital disturbances of a geosynchronous satellite are caused by the





64856. Ball bearing can be removed by using:





64857. In a stop-and-wait ARQ system, the transmitting terminal





64858. A geostationary satellite is one which





64859. The geostationary communication satellite APPLE is parked in the equatorial orbit at





64860. Power received from Sun per m2 surface area of a geosynchronous satellite in nearly __________ watt.





64861. A certain sound has 10000 times more energy than another sound. The number of times it would sound stronger to a listener is





64862. 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





64863. A communication satellite is a repeater between





64864. The ending part of the popular teleserial Mahabharat will be beamed to the viewers





64865. The most effective anti jamming technique is





64866. For satellite communication, standard Earth stations have antenna diameters in the range of __________ metre.





64867. 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





64868. In satellite communication, frequency modulation is used because satellite channel has





64869. In the case of a 70-MHz IF carrier for a transponder bandwidth of 36 MHz, energy must lie between MHz.





64870. Which of the following factor does NOT contribute to the drift of a geostationary satellite from its stationary position in space?





64871. In communication satellites, the up-link normally operates at a higher frequency than the down-link because it





64872. For global communication, the number of satellites needed is





64873. The noise temperature of sky is about __________ °K.





64874. 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.





64875. In the context of error detection in satellite transmission, ARQ stands for





64876. To cover all inhabited regions of the Earth, the number of geosynchronous communication satellites required





64877. The different access methods which permit many satellite users to operate in parallel through a single transponder without interfering with each other as





64878. When a communication satellite passes into Earth's shadow, its temperature drops to about __________ ° K.





64879. In envelope detection of an AM waveform





64880. Shannon's Law relates





64881. India's first three-axis stabilised geostationary communication satellite is





64882. Point out the false statement. Launching of geostationary experimental communication satellite has helped India to gain experience in





64883. A modem is





64884. In synchronous detection of an AM signal





64885. A typical signal strength received from a geosynchronous communication satellite is of the order of a few





64886. The expression for satellite link frequencies such as 4/6 GHz denotes that





64887. Assuming a minimum angle of elevation of 5°, a geosynchronous satellite remains in line-of-sight for __________ percentage of Earth's surface.





64888. Mark out the WRONG statement. As compared to FDMA, the demand assignment system TDMA





64889. APPLE was into orbit on 19 th June 1981 by European Space Agency (ESA) from





64890. A telephone user while talking to a person via a satellite has to wait for reply for about __________ millisecond.





64891. Space communication links are being increasingly moved into Ka-band (200-30 GHz) because it





64892. Which of the following statement regarding link loss for a satellite is wrong?





64893. Depending on the technique used, digitized television requires a bit rate between __________ millions.





64894. In selecting a satellite system, the First determining factor is its





64895. Phase modulation is commonly-used for data transmission mainly because





64896. India's Polar Satellite Launch vehicle (PSLV) to be ready in 1991 is designed to launch 1000 kg spacecraft into __________ orbit.





64897. Most of the communication satellites are stationed to the West of their service areas in order to reduce their





64898. The degradation of satellite solar cells with time is mainly due to





64899. The echo heard by a telephone user on a satellite channel can be removed by using





64900. The 1150 kg geosynchronous satellite INSAT-IA parked 36000 km above India had greatly improved India's





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