SSC JE Mechanical Engineering 2018 Set 1 Paper

Question : 141 of 200

Marks: +1, -0

Which of the following statement is INCORRECT for work output of an ideal Otto cycle?

Decreases with an increase in adiabatic index.
Decreases with an increase in compression ratio.
Increases with an increase in pressure ratio.
Both Decreases with an increase in adiabatic index and Decreases with an increase incompression ratio.

Solution:

The efficiency of otto cycle

η =1-1/(r)^{γ-1}

η _\otto∝

workdone.
Hence, adiabatic index

(γ)

decrease efficiency increase and when compression ratio (r) increase efficiency increase.

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