GATE ME 2015 Set 2 — Question 55
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Thermodynamics → Laws & Properties → Carnot Cycle & Entropy
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Question
One kg of air () undergoes an irreversible process between equilibrium state 1 () and equilibrium state 2 (). The change in entropy (in J/kg-K) is ___________
Correct answer
-117 to -115
Solution
For an ideal gas, the change in entropy is given by:Given that , the first term becomes zero:Substituting the given values (, , ):The change in entropy is approximately .
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