GATE ME 2026 Set 1 — Question 44
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Thermodynamics → Power Cycles → Rankine, Reheat & Regenerative
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Question
For an ideal regenerative Rankine cycle, as shown in the figure below, which one of the following options is the correct representation of temperature-entropy (-) diagram?
Correct answer
(A) [figure]
Solution
In an ideal regenerative Rankine cycle where the liquid is heated continuously by the expanding steam within the turbine (as shown in the schematic), the heat transfer occurs at an infinitesimal temperature difference. For this process to be reversible, the entropy decrease of the steam must equal the entropy increase of the liquid at every temperature level. This implies that the expansion process in the turbine (4-5) and the heating process of the liquid (2-3) must be represented by parallel curves on the - diagram. Option (A) correctly depicts this ideal behavior.
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