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

New and old belts will cause vibrations
Belts are available in sets
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
The plasticity is the property of a material which enables it to

Draw into wires by the application of a tensile force
Resist fracture due to high impact loads
Retain deformation produced under load permanently
Regain its original shape after deformation when the external forces are removed

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