Machine Design
A screw is said to be over hauling screw, if the

Friction angle is less than helix angle
Efficiency of screw is 100%
Friction angle is more than helix angle
Friction angle is equal to helix angle

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

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