Machine Design
Taper on the cotter and slot is provided

On one side only
On none of the sides
May be provided anywhere
On both the sides

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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
The angle between the tangent to the pitch helix and an element of the cylinder
None of these
Half the angle between two inclined faces in axial plane

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