Machine Design
A screw will be self locking, if

Friction angle is more than helix angle
Friction angle is less than helix angle
Friction angle is equal to helix angle
Efficiency of screw is 100%

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Machine Design
In composite or reverse laid ropes

Direction of twist of wires in strands is opposite to the direction of twist of strands
Direction of twist of wires and strands are same
Wires are not twisted
Wires in two adjacent strands are twisted in opposite direction

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