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Q11. In a 50% reaction turbine stage, steam leaves the fixed blades with a velocity of 200 m/s, the blade/steam speed ratio is 0.75 and the fixed blade outlet angle is 30°. The mean blade ring diameter is 0.78 m.

(a) Sketch the combined velocity diagram, labelling all velocities and angles.

(b) Determine EACH of the following:

(i) The speed of rotation of the turbine rotor

(ii) The blade inlet angles

(iii) The diagram efficiency.