Machine Design
Basic hole is one

Does not exist
Whose lower as well as upper deviations are zero
Whose upper deviation is zero
Whose lower deviation is zero

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

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

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