Theory of Machine
In a multiple V-belt drive, when a single belt is damaged, it is preferable to change the complete set to

Ensure uniform loading
Reduce slip
Ensure proper alignment
Reduce vibration

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Theory of Machine
For dynamic balancing of a shaft

Both (A) and (B)
None of these
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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