Machine Design
When a beam of rectangular cross-section of width b and depth d, is subjected to a shear force F, the maximum shear stress induced will be

3F/2bh
F/bh
4F/bh
2F/bh

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Machine Design
Coaxing is the procedure of increasing

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

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