Estimate the maximum efficiency of an automobile engine that has a compression ratio of 5:1.0. Assume the engine operates according to the Otto cycle and assume γ = 1.4.

Efficiency of an Otto cycle is = 47.47 %

Explanation:

Compression ratio (r) = 5

Ratio of specific heat () = 1.4

Efficiency of an Otto cycle is given by  = 1 -

Put the values of r and in above formula we get

Efficiency = 1 -

Efficiency = 0.4747 = 47.47 %

This is the efficiency of an Otto cycle.

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explanation: