Theory of Machine
Lower pairs are those which have

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

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Theory of Machine
For dynamic balancing of a shaft

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
None of these

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