Machine Design
Slenderness ratio is the ratio of

Maximum size of column to minimum size of column
Effective length of column to width of column
Effective length of column to least radius of gyration of the column
Width of column to depth of column

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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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