Machine Design
In skew bevel gearing, the axes of shafts are

Non-intersecting and nonparallel and the teeth are curved
Intersecting and the teeth are curved
Non-intersecting and non-parallel and the teeth are straight
None of these

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Machine Design
In worm, gears, pitch lead angle is

Half the angle between two inclined faces in axial plane
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

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