Theory of Machine
The two elements of a pair are said to form a higher pair, when they

Are kept in contact by the action of external forces, when in motion
Have a surface contact when in motion
Have a line or point contact when in motion
Permit relative motion

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Theory of Machine
For dynamic balancing of a shaft

None of these
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
Both (A) and (B)

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