Machine Design
In a multiple V-belt drive, if one of the belts break, then

The broken belt need not to be replaced
Only the broken belt is replaced
The entire set of belts is replaced
The broken belt and the belt on either side of it, is replaced

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Machine Design
In replacing the V-belts, a complete set of new belts is used instead of replacing a single damaged belt because

The new belt will carry more than its share and result in short life
Belts are available in sets
New and old belts will cause vibrations
Only one belt cannot be fitted with other used belts

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