Machine Design
In hydrodynamic bearings

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

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Machine Design
The elasticity is the property of a material which enables it to

Resists fracture due to high impact loads
Draw into wires by the application of a tensile force
Regains its original shape after deformation when the external forces are removed
Retain deformation produced under load permanently

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