Machine Design
Castle nut is a locking device in which

Through slots are made at top and a cotter pin is passed through these and a hole in the bolt, and cotter pin spitted and bent in reverse direction at other end
A hard fibre or nylon cotter is recessed in the nut and becomes threaded as the nut is screwed on the bolt causing a tight grip
A slot is cut partly is middle of nut and then slot reduced by tightening a screw
One smaller nut is tightened over main nut and main nut tightened against smaller one by loosening, creating friction jamming

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Machine Design
Which is correct statement?

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

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