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Question

The efficiency of Carnot cycle is maximum for : 

A.

Gas engine

B.

Reversible engine

C.

Petrol engine 

D.

Steam engine

Answer ( Option B)

Reversible engine

Solution

Ÿ    The Carnot cycle is reversible representing the upper limit on the efficiency of an engine cycle. Practical engine cycles are irreversible and thus have inherently lower efficiency than the Carnot efficiency when operating at the same temperatures.

Ÿ    The Carnot cycle achieves maximum efficiency because all the heat is added to the working fluid at the maximum temperature.

Hence, the correct option is (B).

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