An efficiency of 90% obviously implies loss. Some of this might come from mechanical sources, such as the friction involved in rotating the turbine shaft or from the viscous drag of the water. Must most of the loss, in fact, comes from electromagnetic sources. List what you think these sources are and discuss how they reduce the efficiency.

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.