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Q8. An impulse turbine has a nozzle at entrance.

(a) Calculate the nozzle exit velocity if the change in enthalpy across the nozzle is 720 kJ/kg. (2)

(b) Sketch a blade velocity diagram labelling all significant angles and velocities. (3)

(c) The nozzle entrance angle is 14°, the blade velocity is 460 m/s, and the blades are symmetrical and have an angle of 38°.

Determine the diagram power if the blade velocity coefficient is 0.98 and the mass flowrate of the steam is 0.6 kg/s. (11)