Machine Design
Which is correct statement?

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

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Machine Design
Stress concentration is caused due to

Pitting at points or areas at which loads on a member are applied
All of these
Abrupt change of section
Variation in properties of material from point to point in a member

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