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Olympiad workbook

Exam: Olympiad workbook
Subject: NSEP
Chapter: Thermodynamics

Olympiad workbook · NSEP · Thermodynamics

Two Carnot heat engines are connected in series such that the sink...

Two Carnot heat engines are connected in series such that the sink of the first engine is heat source of the second. Efficiency of the engines are

\eta_1

and

\eta_2

respectively. Net efficiency

\eta

of the combination is given by

Options

A $\eta=\eta_1+\eta_2$
B $\eta=\frac{\eta_1 \eta_2}{\eta_1+\eta_2}$
C $\eta=\eta_1+\eta_2 \left(1-\eta_1\right)$
D $\eta=\eta_1-\eta_2 \left(1-\eta_1\right)$

Correct answer

C. $\eta=\eta_1+\eta_2 \left(1-\eta_1\right)$

Step-by-step solution

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