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 proper alignment
Ensure uniform loading
Reduce vibration
Reduce slip

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Machine Design
The angle of twist of shaft is

Directly proportional to (shaft diameter)⁴
Inversely proportional to (shaft diameter)²
Inversely proportional to (shaft diameter)⁴
Directly proportional to (shaft diameter)²

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