Machine Design
Crowning on pulley helps

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

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

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