Aturbine is supplied with steam at 40 bar, and 400°c which expands through the turbine in steady flow to an exit pressure of 0.2 bar. the turbine has an isentropic efficiency of 90%. if he mass flow rate is 3 kg/s, calculate the power output of the turbine. show that the process is irreversible and calculate the change of specific entropy. heat losses from the turbine are negligible. (2048 kw; 0.643 kj/kg k).