Machine Design
If threads on a bolt are left hand, threads on nut will be

Right hand with same pitch
Right hand with fine pitch
Left hand with same pitch
Could be left or right hand

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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 an element of the cylinder
The angle between the tangent to the pitch helix and the plane of rotation
Half the angle between two inclined faces in axial plane

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