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

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

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Machine Design
When the belt speed increases

Power transmitted remains the same
Power transmitted increases to a maximum value and then decreases
Power transmitted increases
Power transmitted decreases

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