A four cylinder four stroke diesel engine has a bore of 212 mm and a stroke of 292 mm. At full load at 720 rev/min the bmep is 5.93 bar and the specific fuel consumption is 0.226 kg/kW h. The air-fuel ratio as determined by exhaust gas analysis is 25/1. Calculate the break thermal efficiency and the engine. Atmospheric conditions are 1.01 bar and 15 degree Celsius and Q net v, for the fuel may be taken as 44200kJ/kg.