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
Ensure proper alignment
Reduce slip
Ensure uniform loading

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Theory of Machine
Higher pairs are those which have

Surface contact between the two elements when in motion
Point or line contact between the two elements when in motion
Two elements that permit relative motion
Elements of pairs not held together mechanically

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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 double slider crank chain
Second inversion of single slider crank chain

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