Machine Design
The shear stress in a beam varies from zero at the outer fibers to a maximum at the________.

Upper surface
None of these
Lower surface
Neutral surface

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

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