In a two-stage velocity compounded impulse turbine the steam leaves the nozzles at a velocity of 675 m/s, when the blade speed is 150 m/s. The nozzle angle is 20°, while the discharge angles are: 25° for the first row blades, 25° for the fixed blades and 30o for the second row blades. There is a 10 per cent drop in velocity during passage of steam through each row of blades. For the steam flow rate of 5 kg/s, calculate, the power output of the turbine and the diagram efficiency. Also calculate the length of arc occupied by the nozzles if their height is 25 mm. Steam is supplied to the stage at 12 bar, 300°C.