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Q.

A Carnot engine has efficiency of 50%. If the temperature of sink is reduced by 40°C, its efficiency increases by 30%. The temperature of the source will be:

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a

166.7 K

b

367.7 K

c

255.1 K

d

266.7 K

answer is C.

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Detailed Solution

1−TLTH=0.51−TL−40TH=0.65⇒TH=8003K=266.7K

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A Carnot engine has efficiency of 50%. If the temperature of sink is reduced by 40°C, its efficiency increases by 30%. The temperature of the source will be: