Machine Design
The flank of the tooth is the

Surface of the tooth above the pitch surface
Surface of the tooth below the pitch surface
Surface of the top of the tooth
Width of the tooth measured along the pitch circle

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Machine Design
In worm, gears, pitch lead angle is

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
The angle between the tangent to the pitch helix and the plane of rotation

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