Machine Design
The shearing stresses in the inner face as compared to outer face of the wire in a heavy close coiled spring is

Smaller
Larger/smaller depending on diameter of spring coil
Larger
Equal

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Machine Design
Coaxing is the procedure of increasing

Fatigue limit by over-stressing the metal by successively increasing loadings
Metal strength by cycling
Metal resistance to corrosion by coating
Metal hardness by surface treatment

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