Machine Design
Jam nut is a locking device in which

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 spitted and bent in reverse direction at other end
One smaller nut is tightened over main nut and main nut tightened against smaller one by loosening, creating friction jamming
A slot is cut partly in middle of nut and then slot reduced by tightening a screw

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Machine Design
Which of the following statement is wrong for a connecting rod?

If Ixx < 4 Iyy, the buckling will occur about X-axis
The connecting rod will be equally strong in buckling about X-axis and Y-axis, if Ixx = 4 Iyy
The most suitable section for the connecting rod is T-section
If Ixx > 4 Iyy, the buckling will occur about Y-axis

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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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