Machine Design
The function of cutting oil when threading a pipe is to

Lubricate the dies
Provide cooling action
Help removes chips
All 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 inner surface and zero at the outer surface
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

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