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

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

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Machine Design
In case of thick cylinders, the tangential stress across the thickness of cylinder is

Maximum at the outer surface and zero at the inner surface
Maximum at the inner surface and zero at the outer surface
Maximum at the inner surface and minimum at the outer surface
Maximum at the outer surface and minimum at the inner surface

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