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
Reduce slip
Ensure uniform loading
Reduce vibration

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Machine Design
When the shaft rotates in anticlockwise direction at slow speed in a bearing, it will

Move towards right of the bearing making no metal to metal contact
Move towards left of the bearing making metal to metal contact
Move towards right of the bearing making the metal to metal contact
Have contact at the bottom most of the bearing

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