Two reversible engines are connected in series between a heat source a – McqOptions

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1.	Two reversible engines are connected in series between a heat source and a sink. The efficiencies of these engines are 60% and 50%, respectively. If these two engines are replaced by a single reversible engine, the efficiency of this engine will be
A.	60%
B.	70%
C.	80%
D.	90%
Answer» D. 90%

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