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

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
Draw into wires by the application of a tensile force

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Machine Design
A woodruff key is

Fitted in pairs at right angles
A tapered key with head at one end
All of these
Capable of tilting in a recess milled out in the shaft

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