Theory of Machine
In multi V-belt transmission, if one of the belt is broken, we have to change the

All the belts
There is no need of changing any one as remaining belts can take care of transmission of load
Broken belt
Broken belt and its adjacent belts

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Theory of Machine
Kinematic 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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