Question

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.

Answer 1

Efficiency of an Otto cycle is = 47.47 %

Step-by-step explanation:

Compression ratio (r) = 5

Ratio of specific heat (
`\gamma`) = 1.4

Efficiency of an Otto cycle is given by = 1 -
`(1)/(r^(\gamma - 1) )`

Put the values of r and
`\gamma` in above formula we get

Efficiency = 1 -
`(1)/(5^(1.4 - 1) )`

Efficiency = 0.4747 = 47.47 %

This is the efficiency of an Otto cycle.