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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Theory of Machine
Angle of ascent 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
During which the follower returns to its initial 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 highest position

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Theory of Machine
For dynamic balancing of a shaft

None of these
Both (A) and (B)
The net couple due to the dynamic forces acting on the shaft is equal to zero
The net dynamic force acting on the shaft is equal to zero

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