Theory of Machine
The pair is known as a higher pair, when the relative motion between the elements of a pair is

Sliding only
Turning only
Rolling only
Partly turning and partly sliding

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Theory of Machine
Cam angle 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
During which the follower returns to its initial position

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