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Q9. The stepped steel shaft shown in Fig Q7 is to transmit a torque. The larger diameter section of the shaft is to have a hole drilled in it to a depth of 100 mm. Calculate EACH of the following:

(a) The diameter of the drilled hole ‘d’ that would make the maximum stress in the hollow part of the shaft equal to the maximum stress in the 34 mm diameter section;

(b) The length of the 34 mm section if the total angle of twist for the shaft is to be 0.02 rad when a torque of 400 Nm is applied.

Note: Modulus of Rigidity for shaft material = 80 GN/m²