Machine Design
Slenderness ratio is the ratio of

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

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Machine Design
A woodruff key is

Fitted in pairs at right angles
All of these
Capable of tilting in a recess milled out in the shaft
A tapered key with head at one end

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