Machine Design
Idler pulley is used for

Increasing velocity ratio
For applying tension
Changing the direction of motion of belt
All of these

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Machine Design
In composite or reverse laid ropes

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

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