The external diameter and internal diameter of hollow shaft in the ratio of 3:2 is to transmit 400kW power at 120rpm.The maximum expected torque is 16% greater than mean value. The maximum stress developed in 2.2m length having 1.5o angle of twist is not to exceed 50 N/mm2 .Find the values of the shaft diameter satisfying these conditions. Take G=0.85*105N/mm2
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