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The temperature of sink of Carnot engine is 27°C. Efficiency is 25%. Then ___________

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The temperature of sink of Carnot engine is 27°C. Efficiency is 25%. Then ___________

(a) 227°C

(b) 327°C

(c) 127°C

(d) 27°C

I got this question in a national level competition.

I would like to ask this question from Thermodynamics topic in chapter Kinetic Theory of Gases of Engineering Physics I

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The correct option is (c) 127°C

Easy explanation: 25/100=1-300/T1

300/T1 =1-1/4=3/4

T1=(300×4)/3=400K=127°C.

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