Which of the following factors contributes to belt wear?

Mismatched sheaves contribute significantly to belt wear. When sheaves are mismatched, it means that they may not be of the same size or alignment, leading to improper belt engagement. This can cause the belt to twist or operate at incorrect angles, resulting in uneven tension and increased friction. Over time, this unequal wear and tear can degrade the belt’s material, leading to premature failure.

The other factors mentioned, such as correct tension, regular maintenance, and proper alignment, are necessary for extending the life of the belt. Correct tension ensures that the belt operates efficiently without slipping or over-stretching. Regular maintenance helps keep the system in good working order, catching potential issues before they lead to belt failure. Proper alignment, similarly, ensures that the belt tracks correctly on the sheaves, reducing unnecessary wear and preventing additional stress on the belt.