Machine Design
According to I.B.R., the efficiency of a double riveted butt joint with double cover straps of equal width should be

70 to 83%
45 to 60%
63 to 70%
80 to 90%

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Machine Design
A woodruff key is

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

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