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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Machine Design
A woodruff key is

Fitted in pairs at right angles
All of these
A tapered key with head at one end
Capable of tilting in a recess milled out in the shaft

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