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

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

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Machine Design
Spring stiffness is

Its ability to absorb shocks
Ratio of coil diameter to wire diameter
Its capability of storing energy
Load required to produce unit deflection

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