Machine Design
A coupling used to connect two perfectly aligned shafts, is

Flange coupling
Compression coupling
Muff coupling
All of these

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Machine Design
In composite or reverse laid ropes

Wires are not twisted
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 in two adjacent strands are twisted in opposite direction

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