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

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

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Machine Design
A fast and loose pulley drive is used when

Driven shaft is to be started or stopped whenever desired without interfering with the driving shaft
Shafts are arranged parallel and rotate in the same directions
Shafts are arranged parallel and rotate in the opposite directions
Shafts are arranged at right angles and rotate in one definite direction

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