Kinetic Theory and Thermodynamics: Heat Engine MCQ

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Heat EngineHardQuestion 31059

Question

A steam engine has a source at 200°C and a sink at 20°C. Its actual efficiency is 25%. The ratio of actual efficiency to Carnot efficiency is approximately:

A
0.66
Correct
B
0.6
C
0.7
D
0.8

Correct answer

0.66

Explanation

$η_C=1-293/473≈0.3805$ . Hence $η_{actual}/η_C=0.25/0.3805≈<strong>0.66</strong>$ .

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