Machine Design
The fatigue stress concentration factor is defined as

The product of the endurance limits with and without stress concentration
All of these
The ratio of endurance limit with stress concentration to the endurance limit without stress concentration
The ratio of endurance limit without stress concentration to the endurance limit with stress concentration

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Machine Design
Spring index is

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

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