An oil pump is drawing 34 kW of electric power while pumping oil with = 860 kg/m3 at a rate of 0.1 m3 /s. The inlet and outlet diameters of the pipe are 8 cm and 12 cm, respectively (see Fig. 5-1). If the pressure rise of oil in the pump is measured to be 400 kPa and the motor efficiency is 95%, determine the followings (Neglect the energy stored in the paddle wheel);
i) The mechanical efficiency of the pump
ii) The overall efficiency this pump/motor unit