Machine Design
In a hydrodynamic lubricated bearing

There is a thick film of lubricant between the journal and the bearing
There is a thin film of lubricant between the journal and the bearing
There is no 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
The flank of the tooth is the

Width of the tooth measured along the pitch circle
Surface of the tooth below the pitch surface
Surface of the tooth above the pitch surface
Surface of the top of the tooth

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