Machine Design
The power transmitted by the belt drive can be increased by

Dressing the belt to increase the coefficient of friction
Increasing wrap angle by using idler pulley
All of these
Increasing the initial tension in the belt

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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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