Machine Design
The fatigue stress concentration factor is defined as

The product of the endurance limits with and without stress concentration
The ratio of endurance limit without stress concentration to the endurance limit with stress concentration
The ratio of endurance limit with stress concentration to the endurance limit without stress concentration
All of these

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

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

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