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For a calorically perfect gas, entropy is not________(a) State function(b) Conserved in a reversible process(c) A function of two thermodynamic variables(d) Zero alwaysThe question was asked in an interview for internship.This key question is from A Brief Review of Thermodynamics in chapter Compressible Flow – Preliminary Aspects of Aerodynamics

Answer»

The correct choice is (d) Zero always

To explain: The enthalpy is a state function. This is true for all type of gases. It is conserved for a REVERSIBLE process (SINCE no generation of ENTROPY takes place due to DISSIPATION). From the formula, it is visible that entropy always is a function of two thermodynamic VARIABLES (p, T) or (v, T), etc. It is not zero always.



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