Machine Design
According to I.B.R., the efficiency of a triple riveted butt joint with double straps of unequal width (5 rivets per pitch length) should be

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

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Machine Design
A bolt of uniform strength can be developed by

None of these
Keeping the core diameter of threads equal to the diameter of unthreaded portion of the bolt
Keeping the core diameter smaller than the diameter of the unthreaded portion
Keeping the nominal diameter of threads equal to the diameter of unthreaded portion of the bolt

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