Machine Design
A key way lowers

The ductility of the shaft
Both the strength and rigidity of the shaft
The rigidity of the shaft
The strength of the shaft

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Machine Design
In oilness bearings

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

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