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

Reduce vibration
Reduce slip
Ensure uniform loading
Ensure proper alignment

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Theory of Machine
In a steam engine, the earlier cut-off with a simple slide valve may be obtained by increasing the steam lap and the angle of advance of the eccentric but keeping constant the travel and lead of the valve, this method will

Reduce length of effective stroke of piston
Cause withdrawing or throttling of steam
Reduce maximum opening of port to steam
All of the listed here

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