Machine Design
A double strap butt joint (with equal straps) is

Any one of these
Either in single shear or double shear
Always in double shear
Always in single shear

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Machine Design
A bolt of uniform strength can be developed by

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

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