Machine Design
The design of shafts made of brittle materials is based on

Rankine's theory
St Venant's theory
Guest's theory
Von Mises theory

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Machine Design
Crowning on pulley helps

In decreasing the slip of the belt
To keep the belt in centre on a pulley while it is in motion
To increase pulley life
In increasing the slip of the belt

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

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

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