Machine Design
For standard coarse threads of nut, the threads will be as strong in failure by shear as the bolt in tension, if the height of nut (h) is approximately

0.8 times
0.7 times
0.6 times
0.4 times

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Machine Design
A woodruff key is

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

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