Machine Design
In a multiple V-belt drive, if one of the belts break, then

Only the broken belt is replaced
The entire set of belts is replaced
The broken belt and the belt on either side of it, is replaced
The broken belt need not to be replaced

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Machine Design
In cross or regular lay ropes

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
Wires are not twisted

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