a four cylinder petrol engine has an power output of 4.8 kw at 180 rpm. a morse test is carried out and brake torque readings with each cylinder cut off in turn are 177nm, 170nm,169nm,and 173nm respectively .for normal running at this speed, the specific fuel consumption is 0.364 kg/kwh with respect to brake power. tje calorific value of fuel is 42 mj/kg. calculate mechanical efficiency and brake thermal efficiency of the engine.
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