The steam from the nozzles of a single-wheel impulse turbine discharges with a velocity of 600 m/s and at 20° to the plane of the wheel. the blade wheel rotates at 300 rpm and the mean blade radius is 590 mm. the axial velocity of the steam at exit from the blade is 164 m/s and the blades are symmetrical. calculate: (a) the blade angles; (b)the diagram work per unit mass flow rate of steam; (c)the diagram efficiency; (d)the blade velocity coefficient.