Machine Design
In radial cams, the follower moves

In a direction parallel to the cam axis
In a direction perpendicular to the cam axis
Along the cam axis
In any direction irrespective of cam axis

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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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