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In a spark ignition engine working on air-standard otto cycle, the pressure in the cylinder at 20 and 80% of the compression stroke are measured

In a spark ignition engine working on air-standard otto cycle, the pressure in the cylinder at 20 and 80% of the compression stroke are measured to be 0.12 and 0.52 MPa, respectively. Determine the air-standard efficiency of the cycle.

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