Correct option is A
Condition-based maintenance (CBM) is a type of preventive maintenance that is performed based on the actual condition of equipment, rather than following a fixed time schedule. In this approach, parameters such as vibration, temperature, noise, or oil quality are continuously monitored using sensors and diagnostic tools. Maintenance is carried out only when indicators show signs of deterioration or potential failure, making it highly efficient.
This method helps in reducing unnecessary maintenance activities and avoids unexpected breakdowns. In contrast, time-based maintenance is performed at regular intervals regardless of machine condition, which may lead to either over-maintenance or under-maintenance. Breakdown maintenance and run-to-failure maintenance are reactive approaches, where action is taken only after failure occurs.
