Machine Design
A bolt

Has a head on one end and a nut fitted to the other
Is provided with pointed threads
Has both the ends threaded
Has head at one end and other end fits into a tapped hole in the other part to be joined

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Machine Design
Which is correct statement?

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
Which one is rigid will depend on several other factors

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Machine Design
Split nut is a locking device in which

One smaller nut is tightened over main nut and main nut tightened against smaller one by loosening, creating friction jamming
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
Through slots are made at top and a cotter pin is passed through these and a hole in the bolt, and cotter pin splitted and bent in reverse direction at the other end
A slot is cut partly in middle of nut and then slot reduced by tightening screw

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Machine Design
In order to determine the stresses in a thin cylinder due to an internal pressure, it is assumed that

The effect of curvature of the cylinder wall is neglected
The tensile stresses are uniformly distributed over the section of the walls
The effect of the restraining action of the heads at the end of the pressure vessel is neglected
All of these

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