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Which one of the following assumptions is not involved while deriving relation for air standard efficiency of Otto cycle?

[A].	The working fluid is air for which the specific heats are constant	[B].	There is no chemical reaction inside the engine clinder
[C].	Expansion and compression are adiabatic	[D].	There is always thermal and chemical equilibrium
[E].	The engine operates at mederate rpm

Answer: Option E