Machine Design
The plasticity is the property of a material which enables it to

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

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Machine Design
Crowning on pulley helps

In decreasing the slip of the belt
To increase pulley life
To keep the belt in centre on a pulley while it is in motion
In increasing the slip of the belt

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