Machine Design
In nitrated parts, the origins of the fatigue cracks will occur at

Within the core
Just below the surface
None of these
Surface

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

Resists fracture due to high impact loads
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

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