Engineering Thermodynamics
The air standard efficiency of an Otto cycle is given by (where r = Compression ratio, and γ = Ratio of specific heats)

1 + rγ - 1
1 - rγ - 1
1 + (1/ rγ - 1)
1 - (1/ rγ - 1)

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Engineering Thermodynamics
Which is the incorrect statement about Carnot cycle?

All the heat engines are based on Carnot cycle
It is used as the alternate standard of comparison of all heat engines
All of these
It provides concept of maximising work output between the two temperature limits

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