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An oil engine working on the dual combustion cycle has a compression ratio 14 and the explosion ratio

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An oil engine working on the dual combustion cycle has a compression ratio 14 and the explosion ratio obtained from an indicator card is 1.4. If the cut-off occurs at 6 per cent of stroke, find the ideal efficiency. Take γ for air = 1.4.

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Compression ratio, r = 14 

Explosion ratio, β = 1.4

If ρ is the cut-off ratio,

Ideal efficiency is given by

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