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200 litre of air at 4 bar and 400 kelvin is contained in a system.A reversible adiabatic expansion takes place till the pressure fall to 1.The gas is then heated at constant pressure till the enthalpy increases to 72 kilojoule calculate (i) the world done.(ii) The Index of expansion if the above process are replaced by a single polytropic process giving the same work between the same initial and final stages.
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