A four cylinder petrol engine has an output of 53 kW at 2000 rpm. A morse test is carried out on the engine and the torque readings of Ist to 4th cylinders are, respectively, 176 Nm, 171 Nm, 168 Nm and 173 Nm. For normal running at this speed, the bsfe is 0.365 kg/kWh. The heating value of fuel is 44.3 MJ/kg.
Calculate (1) friction power, (ii) mechanical efficiency, and (iii)
thermal efficiency of the
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