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Q1. A compound shaft consists of two sections of the same material arranged in series and is required to transmit 16kW at 80 rev/min. Section A is solid of outside diameter 60mm and length 120mm. Section B is hollow with a concentric hole 70% of the outside diameter. The angle of twist is to be the same for each section. The torsional stress in section A is 150% of that in section B.

Calculate EACH of the following:

(a) the outside diameter of section B of the shaft;

(b) the length of section B;

(c) the maximum shear stress in both sections of the shaft.