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A Carnot engine has its source at 127 °C and sink at 27 °C. Its efficiency is
A25%
B21%
C79%
D50%
Answer & Solution
Correct answer: A. 25%
In kelvin, T1 = 400 K and T2 = 300 K, so η = 1 - 300/400 = 0.25 or 25%.
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