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The efficiency of a Carnot engine operating with reservoir temperatures kept at 100 °C and -23°C will be ___________

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The efficiency of a Carnot engine operating with reservoir temperatures kept at 100 °C and -23°C will be ___________

(a) (100+23)/100

(b) (100-23)/100

(c) (373+250)/373

(d) (373-250)/373

I have been asked this question during an online exam.

Query is from Isothermic and Adiabatic Process topic in division Kinetic Theory of Gases of Engineering Physics I

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The correct choice is (d) (373-250)/373

For explanation: Ƞ=(T1-T2)/T1

Ƞ=1-300/400=1/4=25%

Hence efficiency of 26% with real engine is impossible.

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