Machine Design
When a circular beam of diameter d is subjected to a shear force F, the maximum shear stress induced will be

16F/ 3πd²
6F/ πd²
8F/ πd²
4F/ πd²

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Machine Design
When a machine member is subjected to torsion, the torsional shear stress set up in the member is

Zero at both the centroidal axis and outer surface of the member
Maximum at the centroidal axis and zero at the outer surface of the member
Zero at the centroidal axis and maximum at the outer surface of the member
Maximum at both the centroidal axis and outer surface of the member

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