Machine Design
A key capable of tilting in a recess milled out in a shaft is known as

Flat saddle key
Feather key
Woodruff key
Hollow saddle key

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Machine Design
In a hydrodynamic lubricated bearing

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

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