Machine Design
Set screws are

Similar to small size tap bolts except that a greater variety of shapes of heads are available
Similar to stud
Used to prevent relative motion between parts
Slotted for a screw driver and generally used with a nut

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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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