Machine Design
A key made from a cylindrical disc having segmental cross-section, is known as

Gib head key
Flat saddle key
Feather key
Woodruff key

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Machine Design
In worm, gears, pitch lead angle is

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

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