Theory of Machine
An imaginary circle which by pure rolling action, gives the same motion as the actual gear, is called

Dedendum circle
Addendum circle
Pitch circle
Clearance circle

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Theory of Machine
Cam angle is defined as the angle

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
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

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Theory of Machine
Kinematic pairs are those which have

Surface contact between the two elements when in motion
Point or line contact between the two elements when in motion
Two elements that permit relative motion
Elements of pairs not held together mechanically

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