Machine Design
In helical gears, the distance parallel to the axis, between similar faces of adjacent teeth, is called

Normal pitch
Module
Diametral pitch
Axial pitch

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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
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

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

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Machine Design
The flank of the tooth is the

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

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