An internal gear pump delivers 45 litres of hydraulic fluid per minute at a pressure of 20 mpa when driven at 1430 r/min. calculate the input power to the pump shaft and the displacement volume per revolution if the mechanical efficiency of the pump is 90% and its volumetric efficiency is 85%.

An open feedwater heater operates at steady state with liquid entering at inlet 1 with t? = 40°c and pl = 1 .2 mpa. water vapor att2-200°c and p2 = 1.2 mpa enters at inlet 2. saturated liquid water exits with a pressure of pa 1.2 mpa. neglect heat transfer with the surroundings and all kinetic and potential energy effects, determine the mass flow rate of steam at inlet 2 if the mass flow rate of liquid water at inlet 1 is given as 2 kg/s.