What are considered signs of equipment failure?

Signs of equipment failure are commonly manifested through unusual noises, overheating, and tripped circuit breakers. Each of these indicators typically points to underlying issues affecting the performance or safety of the electrical equipment.

Unusual noises may signal mechanical malfunctions, loose components, or other operational irregularities that require attention. Overheating often suggests that the equipment is operating beyond its intended limits, potentially due to a malfunction or inadequate cooling systems. Tripped circuit breakers are a protective mechanism that cuts off power to prevent damage; frequent tripping indicates that the system is experiencing problems that could lead to equipment failure if not addressed promptly.

The other options reflect positive operational characteristics such as increased efficiency or reduced costs, which are not indicative of failure. Equipment functioning well and reliably, along with optimal energy output, implies that it is performing as expected rather than failing. Therefore, the option highlighting unusual noises, overheating, and tripped circuit breakers is the correct determination of signs of equipment failure.