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

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Machine Design
The designation M 33 × 2 of a bolt means

Metric threads of 33 mm outside diameter and 2 mm pitch
Metric threads with cross-section of 33 mm
Metric threads of 33 numbers in 2 cm
Bolt of 33 mm nominal diameter having 2 threads per cm

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