7.7 Consider a turbine consisting of two stages. The overall pressure ratio is four and the inlet conditions are 500 K and a pressure of four atmospheres. Assume that each stage has the same stage...

Extracted text: 7.7 Consider a turbine consisting of two stages. The overall pressure ratio is four and the inlet conditions are 500 K and a pressure of four atmospheres. Assume that each stage has the same stage efficiency and pressure ratio. If the isentropic tur- bine efficiency is 85%, calculate the stage efficiency. Ans: Nst- 83.3%; n,> Nst