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Q.

A Carnot engine has efficiency 25%. It operates between reservoirs of constant temperatures withtemperature difference of 80 K. What is the temperature of the low temperature reservoir?

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a

-250C

b

250C

c

-330C

d

330C

answer is C.

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Detailed Solution

Efficiency of a Carnot engine, i.e.η=1−T2T1=T1−T2T1⇒ 25100=T1−T1−80T1⇒ 14=80T1⇒T1=320KT1=320−273=47∘CTemperature of the low temperature reservoir=47−80=−33∘C
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