Steam at 6 MPa and 500C enters a two-stage adiabatic turbine at a rate of 15 kg/s.

Question:

Steam at 6 MPa and 500°C enters a two-stage adiabatic turbine at a rate of 15 kg/s. 10 percent of the steam is extracted at the end of the first stage at a pressure of 1.2 MPa for other use. The remainder of the steam is further expanded in the second stage and leaves the turbine at 20 kPa. Determine the power output of the turbine, assuming
(a) The process is reversible and
(b) The turbine has an isentropic efficiency of 88 percent.