Machine Design
In a hydrodynamic lubricated bearing

There is a thin film of lubricant between the journal and the bearing
There is no lubricant between the journal and the bearing
There is a thick film of lubricant between the journal and the bearing
The lubricant is forced between the journal and the bearing, by external pressure

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Machine Design
Crowning on pulley helps

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

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