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Q7. A hollow cast iron shaft is to transmit a power of 750 kW at 120 rev/min. The angle of twist in the shaft is not to exceed one degree over a length of 30 times the external diameter. The ratio of the external to the internal diameters is 3:2.

Calculate EACH of the following:

(a) the minimum outside diameter for the shaft. (12)

(b) the maximum shear stress at the inner and outer surfaces of the shaft. (4)

Note: The Modulus of Rigidity for cast iron = 40 GN/m².