A Rankine cycle with superheat and reheat has steam entering the turbine at 15 MPa and 500°C. The steam is extracted and sent to the reheater at a pressure of 3 MPa, and returns to the turbine at 500°C. The condenser pressure is 20 kPa. The cycle produces 400 MW of power. Determine the mass flow rate of the steam, the exit quality (or temperature) from the turbine, and the thermal efficiency of the cycle for (a) an isentropic turbine and pump, and (b) a turbine with an isentropic efficiency of 0.75 and a pump with an isentropic efficiency of 0.65.
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