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GATE Mechanical Engineering (ME) 2020 Shift 2 Solved Paper

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Question : 61

Total: 65

One kg of air in a closed system undergoes an irreversible process from an initial state of p1=1 bar (absolute) and T1=27∘C, to a final state of p2=3 bar (absolute) and T2= 127∘C. If the gas constant of air is 287J/kg⋅K and the ratio of the specific heats γ=1.4, then the change in the specific entropy (in J/kg⋅K) of the air in the process is

−26.3
28.4
indeterminate, as the process is irreversible
172.0

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