Theory of Machine
The pressure angle of a cam depends upon

Angle of ascent
Lift of follower
Offset between center lines of cam and follower
All of these

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Theory of Machine
In a hydrodynamic journal bearing, there is

No 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
A forced lubricant between the journal and the bearing

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