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

Bending stress
Compressive stress
Shear stress
Tensile stress

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Machine Design
When a machine member is subjected to torsion, the torsional shear stress set up in the member is

Zero at both the centroidal axis and outer surface of the member
Maximum at the centroidal axis and zero at the outer surface of the member
Maximum at both the centroidal axis and outer surface of the member
Zero at the centroidal axis and maximum at the outer surface of the member

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