Machine Design
Which is correct statement?

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
Which one is rigid will depend on several other factors
Both will be equally rigid

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Machine Design
Which is correct statement? Stress concentration in static loading is

Very serious in brittle materials and less serious in ductile materials
Very serious in ductile materials and less serious in brittle materials
Equally serious in both types of materials
Seriousness would depend on other factors

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