Machine Design
The contact ratio is the ratio of

Length of arc of approach to the circular pitch
Length of arc of contact to the circular pitch
Length of arc of recess to the circular pitch
Length of path of contact to the circular pitch

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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
Resists fracture due to high impact loads
Draw into wires by the application of a tensile force
Retain deformation produced under load permanently

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