An inward flow reaction turbine of inlet diameter 1·2 m operates under a head of 150 m and requires a discharge of 6 m3/s at a rotational speed of 400 r.p.m. The guide vane angle is 20°
and the water leaves the runner blade axially. If the runner is 0.1 m wide at the inlet, calculate :
(i) The torque and power supplied to the shaft,
and
(ii) The efficiency of the turbine