Theory of Machine
Cam angle is defined as the angle

During which the follower returns to its initial position
Through which, the cam rotates during the period in which the follower remains in the highest position
Moved by the cam from the instant the follower begins to rise, till it reaches its highest position
Of rotation of the cam for a definite displacement of the follower

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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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