Machine Design
In worm, gears, pitch lead angle is

None of these
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
Half the angle between two inclined faces in axial plane

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Machine Design
Tapered roller bearings can take

Radial load only
Both radial and axial loads and the ratio of these being greater than unity
Axial load only
Both radial and axial loads and the ratio of these being less than unity

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