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Thermodynamics

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The temperature-entropy diagram of a reversible engine cycle is given in the figure. Its efficiency is

1/2

1/4

1/3

2/3

Solution

C.

1/3

straight eta space equals space fraction numerator increment straight W over denominator straight Q subscript BC end fraction space equals space fraction numerator begin display style fraction numerator straight S subscript 0 straight T subscript 0 over denominator 2 end fraction end style over denominator begin display style fraction numerator 3 straight S subscript 0 straight T subscript 0 over denominator 2 end fraction end style end fraction space equals space 1 divided by 3

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