Theory of Machine
When the two elements of a pair have a surface contact when relative motion takes place and the surface of one element slides over the surface of the other, the pair formed is known as a

Lower pair
Force-closed pair
Higher pair
Self-closed pair

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Theory of Machine
For dynamic balancing of a shaft

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

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