Machine Design
Two shafts will have equal strength, if

Twisting moment of both the shafts is same
Diameter of both the shafts is same
Angle of twist of both the shafts is same
Material of both the shafts is same

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Machine Design
In composite or reverse laid ropes

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

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