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
Only one belt cannot be fitted with other used belts
New and old belts will cause vibrations

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Machine Design
Form coefficient of spring is

Concerned with strength of wire of spring
Its capability of storing energy
Ratio of coil diameter to wire diameter
Load required to produce unit deflection

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