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MHT CET Physics question

PhysicsThermodynamicsMHT CET

A reversible engine converts one third input into work. When the temperature of the sink is reduced by 62℃, then efficiency of the engine is tripled. The temperature of the source and sink are

Answer: (C)

Solution

An efficiency of 1/3 needs ; only the pair 229℃ (502 K) and 62℃ (335 K) gives $1 - 335/502 ≈

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Question ID VK-063605