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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Machine Design
Spring stiffness is

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

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