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Q7. The stepped steel shaft shown in Fig Q4 is to transmit a torque. The larger section of the shaft is to have a hole drilled in it to a depth of 80 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 that in the 30 mm diameter section;

(b) the length of the 30 mm section if the total angle of twist for the shaft is to be 0.02 radians when a torque of 360 Nm is applied.

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