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
Equal
Larger/smaller depending on diameter of spring coil
Larger

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

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