Machine Design
Spring stiffness is

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

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Machine Design
In worm, gears, pitch lead angle is

The angle between the tangent to the pitch helix and an element of the cylinder
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

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