Theory of Machine
The cam follower generally used in aircraft engines is

Flat faced follower
Spherical faced follower
Knife edge follower
Roller follower

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

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
Through which the cam rotates during the period in which the follower remains in the highest position
Moved by the cam from beginning of ascent to the termination of descent

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