Machine Design
Form coefficient of spring is

Ratio of coil diameter to wire diameter
Concerned with strength of wire of spring
Its capability of storing energy
Load required to produce unit deflection

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Machine Design
The fatigue stress concentration factor is defined as

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

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