Machine Design
When the shaft rotates in anticlockwise direction at high speed in a bearing, it will

Have contact at the bottom most of the bearing
Move towards right of the bearing making no metal to metal contact
Move towards left of the bearing making metal to metal contact
Move towards right of the bearing making metal to metal contact

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Machine Design
The contact ratio is the ratio of

Length of arc of recess to the circular pitch
Length of arc of contact to the circular pitch
Length of arc of approach to the circular pitch
Length of path of contact to the circular pitch

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

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