Machine Design
In worm, gears, pitch lead angle is

The angle between the tangent to the pitch helix and the plane of rotation
None of these
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

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Machine Design
Plastic flow in ductile materials

Depends on other considerations
Increases the seriousness of static loading stress concentration
Has no effect on it
Lessens the seriousness of static loading stress concentration

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