Machine Design
In the assembly of pulley, key and shaft

Key is made the weakest
Pulley is made the weakest
Key is made the strongest
All the three are designed for equal strength

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

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

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