1.

Whatare SatelliteLaunch Vehicles ? Explaina SatelliteLanuchVehile developedby ISRO withthehelpof schematicdiagram .

Answer»

Solution :(i) Satellite lauch vehicle are usedto placethe satelliteint theirspecificorbits . The functioningofthesatellitelaunchvehicleis basedon theNewton'sthirdlaw of motion.
(ii) The launchvehicle uses specifictypeof fuel.
(iii)The gasproduced due to combustionof the fuelexpands due to itshightemperatureand isexpelled forcellu throughtthe nozzelsat therear of thelaunch vehicle.
(iv) Asa reactionof this ,a thrust actson the vehicle, whichdrives thevehiclehighintothe space.
(v) The structure of the launch vehicle is decided by the weight of the satellite and the type of satellite orbit.

(vi) The fuel forms a major portion of the total weight of the launch vehicle.
(vii) To overcome this problem, launch vehicles with more than one stages are used. Due to this, the weight of the vehicle can be reduced step by step, after its launching.
(viii)For example, consider a launch vehicle having two stages.
For launching the vehicle, the fuel and engine in the first stage are used. This imparts a SPECIFIC velocity to the vehicle and takes it to a CERTAIN height.
(ix) Once the fuel in this first stage is EXHAUSTED, the empty fuel tank and the engine are DETACHED from the main body of the vehicle and fall EITHER into a sea or on an unpopulated land.
(x) As the fuel in the first stage is exhausted, the fuel in the second stage is ignited.
(xi) Since, the vehicle now contains only one stage, the weight has now been reduced and the vehicle can move with higher speed. Almost all vehicles are made of either two or more stages.
(xii)As an example, Polar Satellite Launch Vehicle (PSLV).


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