Machine Design
In a hydrodynamic lubricated bearing

There is a thin film of lubricant between the journal and the bearing
The lubricant is forced between the journal and the bearing, by external pressure
There is no lubricant between the journal and the bearing
There is a thick film of lubricant between the journal and the bearing

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Machine Design
Tapered roller bearings can take

Radial load only
Both radial and axial loads and the ratio of these being less than unity
Both radial and axial loads and the ratio of these being greater than unity
Axial load only

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Machine Design
Turn buckle has

Right hand threads on bout ends
No threads
Left hand threads on both ends
Left hand threads on one end and right hand threads on other end

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