Theory of Machine
The pressure angle of a cam depends upon

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

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Theory of Machine
Angle of descent of cam is defined as the angle

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

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