Theory of Machine
A body in motion will be subjected to Coriolis acceleration when that body is

Restrained to rotate while sliding over another body
In plane motion which is a resultant of plane translation and rotation
In plane rotation with variable velocity
In plane translation with variable velocity

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Theory of Machine
Crowning on pulleys helps

For automatic adjustment of belt position so that belt runs centrally
Increase belt and pulley life
In increasing velocity ratio
In decreasing the slip of the belt

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