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Home⇒ Engineering⇒
Satellite communication
1-Dont try to cram or spend more time here just read it fast and cover syllabus then practice MCQ's cheptor of same topic to check your progress. . |
2-Wrong options are also given but dont concentrate there, Right answer is in bold format. |
Q21 ⇒ A 20 m antenna gives a certain uplink gain at frequencies of 4/6 GHz. For getting same gain in the 20/30 GHz band, antenna size required is metre. 4 [other wrong options] [Discuss in forum] 100 1 10 |
Q22 ⇒ 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. 0.1 [other wrong options] [Discuss in forum] 1 2 0.5 |
Q23 ⇒ At present, the radio-frequency band mainly used by most satellites is SHF [other wrong options] [Discuss in forum] EHF UHF VHF |
Q24 ⇒ Power received from Sun per m2 surface area of a geosynchronous satellite in nearly __________ watt. 1000 [other wrong options] [Discuss in forum] 100 500 2000 |
Q25 ⇒ In the case of a 70-MHz IF carrier for a transponder bandwidth of 36 MHz, energy must lie between MHz. 52 and 88 [other wrong options] [Discuss in forum] 34 and 106 106 and 142 34 and 142 |
Q26 ⇒ When a communication satellite passes into Earth's shadow, its temperature drops to about __________ ° K. 123 [other wrong options] [Discuss in forum] 273 243 170 |
Q27 ⇒ Assuming a minimum angle of elevation of 5°, a geosynchronous satellite remains in line-of-sight for __________ percentage of Earth's surface. 25 [other wrong options] [Discuss in forum] 30.3 42.4 50 |
Q28 ⇒ India's Polar Satellite Launch vehicle (PSLV) to be ready in 1991 is designed to launch 1000 kg spacecraft into __________ orbit. sun-synchronous polar [other wrong options] [Discuss in forum] geostationary equatorial polar |
Q29 ⇒ In satellite communication, highly directional antennas are used to direct the spot beam to a particular region of space on Earth [other wrong options] [Discuss in forum] strengthen the beam to overcome the cosmic noise make corrections in change of polarisation of the beam select a particular channel in transmission and reception |
Q30 ⇒ System satellites orbit the Earth once in 24 hours [other wrong options] [Discuss in forum] 12 hours 1 hours 6 hours |
Q31 ⇒ The first geostationary satellite launched in 1965 was called EARLY BIRD (Intelsat-I) [other wrong options] [Discuss in forum] ANIK WESTAR MOLNIYA |
Q32 ⇒ A geosynchronous satellite has all of the above [other wrong options] [Discuss in forum] has the same period a that of the Earth has a circular orbit rotates in the equatorial plane |
Q33 ⇒ Which one of the following statements regarding DSI is wrong? Though it is more efficient than TASI, it is much slower [other wrong options] [Discuss in forum] It is a digital form of TASI A speaker has to wait (it at all) for only a few milliseconds for reallocation of channel It has increased the capacity of satellite channels by a factor of 2.2 or more with out degrading speech quality |
Q34 ⇒ Which one of the following statement is correct? The width of a beam in space is inversely proportional to the width of the transmitting antenna [other wrong options] [Discuss in forum] Satellite spacing is not affected by the bandwidth of the transmitting earth station Beamwidth is independent of antenna size and frequency band used Use of high-frequency bands permits less number of satellites to share the orbit |
Q35 ⇒ The most effective anti jamming technique is spread-spectrum modulation [other wrong options] [Discuss in forum] frequency hopping key leverage once-only key |
Q36 ⇒ 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. 11100 [other wrong options] [Discuss in forum] 28000 15000 36000 |
Q37 ⇒ A modem is an electronic circuit which carries out modulation and demodulation of a carrier frequency [other wrong options] [Discuss in forum] a form of commutator a device for digitizing speech a circuit used for suppressing microwave mterference |
Q38 ⇒ Which of the following statement regarding link loss for a satellite is wrong? Loss in down-link is negligible as compared to that in uplink [other wrong options] [Discuss in forum] For fixed antenna, it is inversely proportional to f2 For fixed frequency, it is inversely proportional to the product of the antenna aperture areas For a given satellite operating at a given frequency, it is inversely proportional to |
Q39 ⇒ Presently, the worlds's largest and most advanced multi-purpose communication satellite is Olympus-I [other wrong options] [Discuss in forum] INSAT-2 Intelsat-V INSAT-ID |
Q40 ⇒ The communication satellite INSAT-IB had to take up the job of INSAT-IA because the latter collapsed within __________ months of its launch. 5 [other wrong options] [Discuss in forum] 12 20 36 |
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