What is preventive maintenance?

What is preventive maintenance? Correct Answer Maintenance done before breakdown of component

When maintenance is done at given pre-defined period of time, before breakdown then it is called preventive maintenance. It has goal to reduce breakdown of components. Unscheduled is not done at pre-defined time.

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What is the ratio of preventive maintenance and total maintenance in primary-metal industry?
Statement I: The fundamental right of the constitution is having the provision for prevention against Preventive detention. Statement II: Only the Parliament can make laws on Preventive detention for all over the country.