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a
All reversible cycles have same efficiency
b
Reversible cycle has more efficiency than an irreversible one
c
Carnot cycle is a reversible one
d
Carnot cycle has the maximum efficiency in all cycles
answer is A.
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Detailed Solution
All reversible engines work for different values of temperature of source and sink hence the efficiencies of all such engines are different. The incorrect statement is all reversible cycles have same efficiency.