Actions carried out according to a time- or machine-run schedule that identify, stop, or mitigate degradation define which type of maintenance?

• A. Preventive Maintenance
• B. Run-to-Failure Maintenance
• C. Predictive Maintenance
• D. Corrective Maintenance

Answer: (A)

The concept being tested is proactive maintenance planned on a schedule to prevent degradation. When actions are performed on a regular time or machine basis, the goal is to stop wear and deterioration before it leads to failure. This fits preventive maintenance, which uses fixed intervals or run-time criteria to carry out tasks like lubrication, inspections, and part replacements to keep equipment healthy.

This differs from run-to-failure, where no planned maintenance occurs until something breaks; from predictive maintenance, which bases interventions on actual condition data and forecasts when failure might occur; and from corrective maintenance, which fixes equipment after a failure has happened.