Machine Design
A self locking screw has

Course threads
Fine threads
Coefficient of friction is greater than tangent of load angle
Hole for inserting split pin

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Machine Design
Spring stiffness is

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

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Machine Design
The fatigue stress concentration factor is defined as

The ratio of endurance limit with stress concentration to the endurance limit without stress concentration
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

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