GATE 2021 MT – Question 55
The figure shows the entropy versus temperature plot of a reversible engine cycle. For $T_1=200$ K and $T_2=600$ K, its efficiency is ______ % (two decimal places).
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Show answer and explanation
Correct answer: 63.00 to 71.00
Explanation
Vertical lines in the T–S plot are isentropic; horizontal lines exchange Qhot=T2ΔS and Qcold=T1ΔS. Efficiency is 1−T1/T2=1−200/600=**66.67%**.