A 350 mm diameter solid steel drive shaft transmits 4500 kW at 120 rpm to a hollow steel shaft via a flanged coupling. The coupling has 12 bolts with a safe working stress of 48 MN/m² fitted on a pitch circle diameter of 640 mm. The hollow shaft has a diameter ratio of 0.75 with the same external diameter as the drive shaft. Calculate EACH of the following: (a) the minimum diameter of the coupling bolts;

A 350 mm diameter solid steel drive shaft transmits 4500 kW at 120 rpm to a hollow steel shaft via a flanged coupling. The coupling has 12 bolts with a safe working stress of 48 MN/m² fitted on a pitch circle diameter of 640 mm. The hollow shaft has a diameter ratio of 0.75 with the same external diameter as the drive shaft. Calculate EACH of the following: (a) the minimum diameter of the coupling bolts;