Machine Design
A connecting rod should be

Strong in buckling about Y-axis
Any one of the above
Strong in buckling about X-axis
Equally strong in buckling about X-axis and Y-axis

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Machine Design
A woodruff key is

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

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Machine Design
A stud

Has a head on one end and a nut fitted to the other
Has both the ends threaded
Has head at one end and other end fits into a tapped hole in the other part to be joined
Has pointed threads

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