Theory of Machine
For dynamic balancing of a shaft

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

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Theory of Machine
Kinematic pairs are those which have

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

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