Machine Design
In hydrodynamic bearings

Grease is used for lubrication
Do not require external supply of lubricant
The oil film is maintained by supplying oil under pressure
The oil film pressure is generated only by the rotation of the journal

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

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