Machine Design
The endurance or fatigue limit is defined as the maximum value of the stress which a polished standard specimen can withstand without failure, for infinite number of cycles, when subjected to

Dynamic load
Completely reversed load
Static as well as dynamic load
Static load

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Machine Design
The contact ratio is the ratio of

Length of arc of recess to the circular pitch
Length of path of contact to the circular pitch
Length of arc of approach to the circular pitch
Length of arc of contact to the circular pitch

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Machine Design
Form coefficient of spring is

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

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Machine Design
Spring stiffness is

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

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