Machine Design
When an open coiled helical compression spring is subjected to an axial compressive load, the stress induced in the wire is

Tensile stress
Compressive stress
Bending stress
Shear stress

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Machine Design
A bolt

Has a head on one end and a nut fitted to the other
Has head at one end and other end fits into a tapped hole in the other part to be joined
Has both the ends threaded
Is provided with pointed threads

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Machine Design
Spring index is

Load required to produce unit deflection
Indication of quality of spring
Its capability of storing energy
Ratio of coil diameter to wire diameter

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