Air goes through a polytropic process from 325 K, 125 kPa to 500 K, 300 kPa. How much work does it give out?Ĭlarification: Process: PV^n = constant = P1(V1)^n = P2(V2)^n Helium gas expands from 350 K, 125 kPa and 0.25 m^3 to 100 kPa in a polytropic process with n = 1.667. It is then slowly expanded according to the relation PV = constant until a final pressure of 100 kPa is attained. A gas initially at 500☌, 1 MPa is contained in a piston-cylinder arrangement with an initial volume of 0.1 m^3. By heat transfer the whole system cools to 25☌, at which point the gas pressure is 1.5 MPa. A piston-cylinder contains carbon dioxide at 2MPa with V=50 L. The air is compressed to 800 kPa in a reversible polytropic process with n = 1.2, after which it is expanded back to 100 kPa in a reversible adiabatic process. A cylinder/piston contains air at 100 kPa and 20☌ with a V=0.3 m^3. Thermodynamics Inteview Questions and Answers for freshers on “Polytropic Process-2”.ġ.
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