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 slip
Ensure uniform loading
Reduce vibration
Ensure proper alignment

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Theory of Machine
In a cone pulley, if the sum of radii of the pulleys on the driving and driven shafts is constant, then

Both open belt drive and crossed belt drive is recommended
The drive is recommended depending upon the torque transmitted
Open belt drive is recommended
Crossed belt drive is recommended

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