Steam enters a turbine stage with an enthalpy of 3628 kJ/kg at 70 m/s and leaves the same stage with an enthalpy of 2846 kJ/kg and velocity of 124 m/s. Calculate the work done by the steam in kJ/kg.

3. (#20ppVIII-20PrM) - -The entrance and exit enthalpies of a steam turbine are 4000 and 3000 kJ/kg respectively. What is the mass of steam entering the turbine if the generator power is 3 MW and generator efficiency is 90 %.

Air at a rate of 50 m3/min enters an adiabatic compressor at a pressure of 100 kPa and a temperature of 24.3 C and exits at 500 kPa and 189.55 C. It then enters an insulated heat exchanger where it gets cooled by water. The air exits the heat exchanger at a temperature of 57.35 C. Water enters the heat exchanger at 20 C and exits at 50 C. Calculate the compressor power in kW, the mass for rate of the cooling water in kg/sec, and the rate of entropy generation for the compressor and the heat exchanger. Assume a mean heat capacity of water at ?? = 4.18 ??/???. You may also assume that there is no pressure drop in the heat exchanger)

Question 3 Consider the turbocharger of an internal combustion engine. The exhaust gases enter the turbine at 450°C at a rate of 0.02 kg/s and leave at 400°C. Air enters the compressor at70°C and 95 kPa at a rate of 0.018 kg/s and leaves at 135 kPa. The mechanical efficiency between the turbine and the compressor is 95 percent (5 percent of turbine work is lost duringits transmission to the compressor). Using air properties for the exhaust gases, determine:(a).The turbine power output, compressor power input, air temperature at the compressor exit,(b).The air temperature at the compressor for the case of isentropic process and isentropic efficiency of the compressor.