Machine Design
Which is correct statement?

Which one is rigid will depend on several other factors
A member made of steel will generally be more rigid than a member of equal load carrying ability made of cast iron
A member made of cast iron will generally be more rigid than a member of equal load carrying ability made of steel
Both will be equally rigid

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Machine Design
Coaxing is the procedure of increasing

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

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