Machine Design
The arms of the pulleys for flat belt drive have

All the three characteristics
Elliptical cross-section
Major axis in plane of rotation
Major axis twice the minor axis

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

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

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