Which of the following is a common sign of equipment needing maintenance?

Unusual noises during operation are indeed a common sign that equipment may require maintenance. Noises such as grinding, squealing, or clanging can indicate that parts are worn, misaligned, or in need of lubrication. These sounds often signal mechanical issues that, if not addressed, could lead to more significant problems or even equipment failure. Proactively addressing these noises can help extend the life of the equipment, maintain efficiency, and prevent costly downtime.

Consistent energy efficiency, stable performance metrics, and regular operation without issues are typically indicators of equipment functioning well. These situations do not generally suggest a need for maintenance, as they imply that the equipment is running smoothly and operating as expected.