Theory of Machine
For dynamic balancing of a shaft

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

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Theory of Machine
In a four bar chain or quadric cycle chain

One is a turning pair and three are sliding pairs
Three are turning pairs and one is a sliding pair
Two are turning pairs and two are sliding pairs
Each of the four pairs is a turning pair

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