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Q8) In a 50% reaction turbine stage, steam leaves the fixed blades with a velocity of 188 m/s, the blade/steam ratio is 0.7 and the fixed blade outlet angle is 28°. The mean blade ring diameter is 0.84 m.

(a) Sketch the combined velocity diagram, labelling all velocities and angles. (2)

(b) Determine each of the following:

(i) the speed of rotation of the turbine rotor in rpm; (4)

(ii) the blade inlet angles; (4)

(iii) the diagram efficiency. (6)