Theory of Machine
The acceleration of a particle at any instant has two components i.e. radial component and tangential component. These two components will be

Parallel to each other
Perpendicular to each other
Inclined at 45°
Opposite to each other

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Theory of Machine
Crowning on pulleys helps

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

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