Machine Design
Cold working

Alone has no influence on fatigue strength
Increases the fatigue strength
Has no influence on fatigue strength
Decreases the fatigue strength

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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
None of these
Half the angle between two inclined faces in axial plane

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