Theory of Machine
For dynamic balancing of a shaft

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

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Theory of Machine
The inversion of a mechanism is

Turning its upside down
Changing of a higher pair to a lower pair
Obtained by fixing different links in a kinematic chain
Obtained by reversing the input and output motion

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