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 slot is cut partly is middle of nut and then slot reduced by tightening a screw
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
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
In order to determine the stresses in a thin cylinder due to an internal pressure, it is assumed that

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

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Machine Design
When the belt speed increases

Power transmitted decreases
Power transmitted increases to a maximum value and then decreases
Power transmitted remains the same
Power transmitted increases

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