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
Oldham's coupling is the

Third inversion of slider crank chain
Third inversion of double slider crank chain
Second inversion of single slider crank chain
Second inversion of double slider crank chain

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