Steam enters a well insulated turbine and expands isentropically throughout. At an intermediate pressure, 20 percent of the mass is extracted for process heating and the remaining steam expands isentropically to 9 kPa. Inlet to turbine: P = 14 MPa, T = 560 C, h = 3486 kJ/kg, s = 6.6 kJ/(kgK) Intermediate stage: h = 276 kJ/kg Exit of turbine: P = 9 kPa, hf = 174 kJ/kg, hg = 2574 kJ/kg, sf = 0.6 kJ/(kgK), sg = 8.1 kJ/(kgK) If the flow rate of steam entering the turbine is 100 kg/s, then the work output (in MW) is____.

Steam enters a well insulated turbine and expands isentropically throu

1.	Steam enters a well insulated turbine and expands isentropically throughout. At an intermediate pressure, 20 percent of the mass is extracted for process heating and the remaining steam expands isentropically to 9 kPa. Inlet to turbine: P = 14 MPa, T = 560 C, h = 3486 kJ/kg, s = 6.6 kJ/(kgK) Intermediate stage: h = 276 kJ/kg Exit of turbine: P = 9 kP_a, h_f = 174 kJ/kg, h_g = 2574 kJ/kg, s_f = 0.6 kJ/(kgK), s_g = 8.1 kJ/(kgK) If the flow rate of steam entering the turbine is 100 kg/s, then the work output (in MW) is____.
A.	125MW
B.	125.56 MW
C.	129.56 MW
D.	525.56 MW
Answer» C. 129.56 MW

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Steam enters a well insulated turbine and expands isentropically throughout. At an intermediate pressure, 20 percent of the mass is extracted for process heating and the remaining steam expands isentropically to 9 kPa. Inlet to turbine: P = 14 MPa, T = 560 C, h = 3486 kJ/kg, s = 6.6 kJ/(kgK) Intermediate stage: h = 276 kJ/kg Exit of turbine: P = 9 kPa, hf = 174 kJ/kg, hg = 2574 kJ/kg, sf = 0.6 kJ/(kgK), sg = 8.1 kJ/(kgK) If the flow rate of steam entering the turbine is 100 kg/s, then the work output (in MW) is____.
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