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Q5. The speed of rotation of a 50% reaction turbine is 4244 rev/min.

In a particular stage the mean blade speed is 200 m/s and the blade height is 10% of the blade ring mean diameter.

The blade speed ratio is 0.6 and the blade exit angle is 25°.

The pressure and temperature of the steam in the stage is 0.5 bar and 100℃ respectively.

(a) Sketch the velocity vector diagram indicating ALL the velocities and blade angles. (4)

(b) State the velocity and angle relationships for a 50% reaction turbine. (2)

(c) Calculate EACH of the following:

(i) The absolute velocity of the steam leaving the stage; (3)

(ii) The diagram efficiency;(3)

(iii) The mass of steam flowing through the stage. (4)