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Q8. (a) Explain the difference between impulse and reaction turbines.

(b) An impulse turbine has a nozzle at the entrance.

Sketch a blade velocity diagram labelling all significant angles and velocities.

(c) The steam enters the blades at a velocity of 750 m/s and nozzle angle of 20°, the blade velocity is 250 m/s, and the blades are symmetrical and have an angle of 30°.

The blade velocity coefficient is 0. 95 and the mass flowrate of the steam is 2 kg/s.

Calculate the diagram power.