Machine Design
The design calculations for members subject to fluctuating loads with the same factor of safety, yield the most conservative estimates when using

Gerber relation
Goodman relation
Soderberg relation
None of these

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Machine Design
In hydrodynamic bearings

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

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