Machine Design
The endurance limit of a material with finished surface in comparison to rough surface is

Less
Same
More or less depending on quantum of load
More

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Machine Design
In worm, gears, pitch lead angle is

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
None of these

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