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
The angle between the tangent to the pitch helix and an element of the cylinder
None of these

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Machine Design
Coaxing is the procedure of increasing

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

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