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The nozzles of De Laval turbine deliver steam at the rate of 900 gm/sec with a velocity of 730 m/sec to a set of blades revolving at the rate of 30000 r.p.m. The diameter of the wheel is 11.5 cm. The nozzles are inclined at an angle of 20° to the plane of wheel rotation. Calculate the (a) diagram efficiency; (b) power developed by the blades; (c) energy lost in the blades per sec. Assume the blade velocity coefficient as 0.72 and outlet blade angle 25°. (d) Also determine the condition for the maximum efficiency of the turbine. Discuss the physical significance of diagram efficiency.

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