Machine Design
The shear stress in a beam varies from zero at the outer fibers to a maximum at the________.

Upper surface
None of these
Lower surface
Neutral surface

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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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Machine Design
Coaxing is the procedure of increasing

Metal hardness by surface treatment
Metal strength by cycling
Fatigue limit by over-stressing the metal by successively increasing loadings
Metal resistance to corrosion by coating

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