Machine Design
In a hydrodynamic lubricated bearing

There is a thick film of lubricant between the journal and the bearing
There is no lubricant between the journal and the bearing
There is a thin 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
Tapered roller bearings can take

Both radial and axial loads and the ratio of these being less than unity
Radial load only
Axial load only
Both radial and axial loads and the ratio of these being greater than unity

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