Machine Design
In oilness bearings

Grease required to be applied after some intervals
The oil film pressure is generated only by the rotation of the journal
Do not require external supply of lubricant
The oil film is maintained by supplying oil under pressure

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Machine Design
In case of thick cylinders, the tangential stress across the thickness of cylinder is

Maximum at the inner surface and minimum at the outer surface
Maximum at the outer surface and minimum at the inner surface
Maximum at the inner surface and zero at the outer surface
Maximum at the outer surface and zero at the inner surface

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