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Q.

A Carnot engine, whose efficiency is 40%, takes in heat from a source maintained at 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

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a

750 K

b

600 K

c

Efficiency of Carnot engine cannot be made larger than 50%

d

1200 K

answer is A.

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Detailed Solution

n=1−T2T1 0.4=1−T2T1 0.4=1−T2500 ∴T2=300 Again 0.6=1−T2T1 =1−300T1 ∴T1=750K .
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