Theory of Machine
The unbalanced force due to reciprocating masses

Varies in magnitude but constant in direction
Varies in magnitude and direction both
Varies in direction but constant in magnitude
Constant in magnitude and direction both

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Theory of Machine
For dynamic balancing of a shaft

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

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