Machine Design
Spring index is

Ratio of coil diameter to wire diameter
Its capability of storing energy
Load required to produce unit deflection
Indication of quality of spring

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Machine Design
In worm, gears, pitch lead angle is

The angle between the tangent to the pitch helix and the plane of rotation
Half the angle between two inclined faces in axial plane
None of these
The angle between the tangent to the pitch helix and an element of the cylinder

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