Machine Design
In worm, gears, pitch lead angle is

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

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Machine Design
Spring stiffness is

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

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