Machine Design
In hydrodynamic bearings

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

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Machine Design
When the shaft rotates in anticlockwise direction at high speed in a bearing, it will

Have contact at the bottom most of the bearing
Move towards right of the bearing making metal to metal contact
Move towards right of the bearing making no metal to metal contact
Move towards left of the bearing making metal to metal contact

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