Theory of Machine
For dynamic balancing of a shaft

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

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Theory of Machine
A body is said to be under forced vibrations, when

None of these
A body vibrates under the influence of external force
No external force acts on a body, after giving it an initial displacement
There is a reduction in amplitude after every cycle of vibration

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