Machine Design
If a shaft made from ductile material is subjected to combined bending and twisting moment, calculations based on which one of the following failure theories will give the most conservative value?

Maximum principal stress theory
Maximum shear stress theory
Maximum strain energy theory
Maximum distortion energy theory

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Machine Design
Coaxing is the procedure of increasing

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

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