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A four stroke petrol engine is designed to develop 35 BHP at 200 RPM. It has an indicated mean effective pressure of 20 kg/cm2, a stroke of 35 cm and a bore diameter of 20 cm. Using this data mechanical efficiency of the engine at the running condition given would be closest to

[A].	50 percent	[B].	60 percent
[C].	70 percent	[D].	80 percent

Answer: Option C

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