Machine Design
The process which improves the machinability of steels, but lowers the hardness and tensile strength is

Full annealing
Process annealing
Spheroidising
Normalising

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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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