Theory of Machine
The pressure angle of a cam is the angle between the direction of the follower motion and a normal to the

Pitch circle
Pitch curve
Base circle
Prime circle

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Theory of Machine
In a hydrodynamic journal bearing, there is

A forced lubricant between the journal and the bearing
A very thin film of lubricant between the journal and the bearing such that there is contact between the journal and the bearing
A thick film of lubricant between the journal and the bearing
No lubricant between the journal and the bearing

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