Ahollow steel shaft is to transmit 4200n-mof torque and is to be sized so that the torsional stress does not exceed 120mpa . if the inside diameter is 70 per sent of the out side diameter what size shaft should be used .use preferd size . what is stress of the inside of the shaft when full torque is applied

Afull journal bearing has a journal diameter of 27 mm, with a unilateral tolerance of -0.028 mm. the bushing bore has a diameter of 27.028 mm and a unilateral tolerance of 0.04 mm. the l/d ratio is 0.5. the load is 1.3 kn and the journal runs at 1200 rev/min. if the average viscosity is 50 mpa-s, find the minimum film thickness, the power loss, and the side flow for the minimum clearance assembly.