Machine Design
In a multiple V-belt drive, when a single belt is damaged, it is preferable to change the complete set in order to

Ensure uniform loading
Reduce slip
Reduce vibration
Ensure proper alignment

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Machine Design
When a belt drive is transmitting maximum power,

Effective tension is half of centrifugal tension
Effective tension is equal to centrifugal tension
Driving tension on tight side is twice the centrifugal tension
Driving tension on slack side is equal to centrifugal tension

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Machine Design
In composite or reverse laid ropes

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

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