A turbine shaft transmits 500 kW power at 900 rpm. The permissible shear stress is 80N/mm while twist is limited to 0.5 in a length of 2.5 m. Take G = 0.8x10 N/mm, on the basis of torsional rigidity; i. Determine diameter of shaft if solid shaft is used. ii. If hollow shaft is chosen with di/do = 0.6, determine the suitable diameters of the shaft.