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

Reduce vibration
Reduce slip
Ensure uniform loading
Ensure proper alignment

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Theory of Machine
The maximum fluctuation of speed is the

Difference of the maximum and minimum speeds
Sum of maximum and minimum speeds
Difference of minimum fluctuation of speed and the mean speed
Variations of speed above and below the mean resisting torque line

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