Machine Design
When two non-parallel or intersecting but coplanar shafts are connected by gears, the arrangement is known as,

None of these
Bevel gearing
Worm gearing
Helical gearing

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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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