Machine Design
When a machine member is subjected to torsion, the torsional shear stress set up in the member is

Zero at the centroidal axis and maximum at the outer surface of the member
Maximum at both the centroidal axis and outer surface of the member
Maximum at the centroidal axis and zero at the outer surface of the member
Zero at both the centroidal axis and outer surface of the member

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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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