GATE ME 2015 Set 1 — Question 20
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Thermodynamics → Laws & Properties → Carnot Cycle & Entropy
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Question
A Carnot engine (CE-1) works between two temperature reservoirs A and B, where and . A second Carnot engine (CE-2) works between temperature reservoirs B and C, where . In each cycle of CE-1 and CE-2, all the heat rejected by CE-1 to reservoir B is used by CE-2. For one cycle of operation, if the net absorbed by CE-1 from reservoir A is , the net heat rejected to reservoir C by CE-2 (in MJ) is ___________
Correct answer
50 to 50
Solution
For a Carnot engine, the ratio of heat transfer is equal to the ratio of absolute temperatures:For CE-1:This heat rejected by CE-1 is the heat input to CE-2. For CE-2:Thus, the net heat rejected to reservoir C by CE-2 is .
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