The isentropic static enthalpy change across a stage of a single-stage impulse turbine is ? hs = 22 kJ/kg. The nozzle exit angle is a 2 = 74?. The mean diameter of the wheel is 148 cm, and the shaft...

The isentropic static enthalpy change across a stage of a single-stage impulse turbine is ? hs = 22 kJ/kg. The nozzle exit angle is a 2 = 74?. The mean diameter of the wheel is 148 cm, and the shaft turns at 1500 rpm. The blades are equiangular with a velocity coefficient of c R = 0.87. The nozzle velocity coefficient is c N = 0.98. (a) Find the steam velocity at the exit of the nozzles. (b) Find the relative velocity and its flow angle at the exit of the rotor. (c) Find the overall efficiency of the stage.