A pelton wheel works at the foot of a dam because of which the head available at the nozzle is 220m. the nozzle diameter is 20 c.m. and coefficient of speed 0.98. The wheel operates at 250 rev/min and generate 3.75 MW of power. Considering that blade angle at outlet is 16o and jet ratio is 0.46. Determine wheel diameters at the pitch circle of blades, the hydraulic turbine efficiency and efficiency.