Machine Design
Spring stiffness is

Its capability of storing energy
Its ability to absorb shocks
Load required to produce unit deflection
Ratio of coil diameter to wire diameter

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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

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

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