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An engine of 250 mm bore and 375 mm stroke works on otto cycle. The clearance volume is 0.00263 m3. The initial pressure and temperature are 1 bar and 50ºC. If the maximum pressure is limited to 25 bar. Find (1) The air standard efficiency of the cycle. (2) The mean effective pressure for the cycle.

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Given that: 

Bore diameter d = 250mm 

Stroke length L = 375mm 

Clearance volume VC = 0.00263 m

Initial pressure P1 = 1bar 

Initial temperature P3 = 25 bar 

We know that, swept volume

∴ The air standard efficiency for Otto cycle is given by

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