The following data are known for a four cylinder four stroke petrol engine: cylinder dimensions: 11 cm bore,13cm stroke; engine speed: 2250 rpm; brake power: 50 kW; friction power: 15kW; fuel consumption rate: 10.5kg/h calorific value fuel: 50,000 kJ/kg; air inhalation rate: 300 kg/h; ambient condition: 150 C, 1.03 bar. Estimate (i) brake mean effective pressure (ii) volumetric efficiency (iii) brake thermal efficiency, and (iv) mechanical efficiency.