Machine Design
In hydrodynamic bearings

Do not require external supply of lubricant
Grease is used for lubrication
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
Pitch point of a cam is

Any point on the pitch circle
A point on the pitch curve having minimum pressure angle
A point on the pitch curve having maximum pressure angle
Any point on the pitch curve

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