Machine Design
The resultant axial load on a bolt depends upon

Relative elastic yielding of the bolt and the connected members
Initial tension due to tightening of the bolt
External load applied
All of these

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

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