Machine Design
In case of thick cylinders, the tangential stress across the thickness of cylinder is

Maximum at the inner surface and zero at the outer surface
Maximum at the outer surface and zero at the inner surface
Maximum at the inner surface and minimum at the outer surface
Maximum at the outer surface and minimum at the inner surface

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Machine Design
A woodruff key is

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

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