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Q.

A Carnot engine, whose efficiency is 40% takes heat from a source maintained at a temperature of 500 K. It is desired to have an engine of efficiency 60%. Then, the intake temperature for the same exhaust (sink) temperature must be (in kelvin)

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answer is 750.

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Detailed Solution

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η=1−T2T1;0.4=1−T2500⇒T2=300K

0.6=1−T2T11=1−300T11⇒T11=3000.4=750K

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