Machine Design
If shearing stress in nut is half the tensile stress in a bolt, then nut length should be equal to

1.25 × diameter of bolt
0.75 × diameter of bolt
1.5 × diameter of bolt
Diameter of bolt

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

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