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In a test a 2-stroke one cylinder diesel engine, following observations were made: Bore -75mm, Stroke -90mm, Engine speed =1200rpm, Mean effective pressure =

In a test a 2-stroke one cylinder diesel engine, following observations were made: Bore -75mm, Stroke -90mm, Engine speed =1200rpm, Mean effective pressure = 7.5bar, Brake arm = 0.5m, Brake load= 500 N, Fuel consumption = 4.08kg/hr., Calorific value of diesel =42000 kJ/kg Calculate - i) Mechanical efficiency ii) Brake thermal efficiency

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