Machine Design
A flanged pipe joint will be a leak-proof joint, if the circumferential pitch of the bolts is (where d = Diameter of bolt hole)

Between 20d and 30d
Less than 20d
Greater than 30d
Equal to inside diameter of pipe

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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
Both will be equally rigid
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

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