Answer: C- Compression ratio
Air standard efficiency of Otto cycle depends on compression ratio.
Otto cycles are one form of air standard cycles that are regarded as the best cycles for the functioning of reciprocating internal combustion engines with spark ignition. The air standard efficiency of the Otto cycle is defined as the output work divided by the total input heat. It is given as;
η = Work/Heat Input = 1 - 1/r(ϒ-1)
- where r represents the compression ratio.
From the above expression, it is clear that the air standard efficiency of the Otto cycle depends on the compression ratio.
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