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Examoogle • User • info@examoogle.com • EE-2024-8821
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Which is not a part of preventive maintenance
Routine maintenance
Periodic maintenance
Overhaul
None of above
None of above
Quick Summary: Preventive maintenance is a proactive strategy focused on maintaining equipment in satisfactory operating condition by providing for systematic inspection, detection, and correction of incipient failures before they occur. Routine maintenance, periodic maintenance, and overhauling are all essential constituents of a structured preventive maintenance program designed to ensure system reliability and longevity.
Preventive maintenance is a proactive strategy focused on maintaining equipment in satisfactory operating condition by providing for systematic inspection, detection, and correction of incipient failures before they occur. Routine maintenance, periodic maintenance, and overhauling are all essential constituents of a structured preventive maintenance program designed to ensure system reliability and longevity.
MTBF=λ1 — Mean Time Between Failures, where λ is the failure rate.
Availability=MTBF+MTTRMTBF — Probability that a system is operating at a given time.
The principle relies on the 'bathtub curve' of equipment failure, where interventions are scheduled based on time, usage, or condition-based triggers. By performing inspections and minor repairs (Routine/Periodic) or major component renewal (Overhaul) at predefined intervals, the probability of random, catastrophic failure is minimized.
Routine maintenance involves daily or weekly checks like lubrication and cleaning.
Periodic maintenance is performed at set intervals (e.g., monthly) based on manufacturer guidelines.
Overhaul involves partial or complete disassembly to restore equipment to 'as-new' condition.
Preventive maintenance aims to increase the Mean Time Between Failures (MTBF).
Reduces the risk of unexpected downtime.
Extends the operational lifespan of electrical equipment.
High initial labor and documentation costs.
Risk of 'over-maintenance' leading to unnecessary wear during disassembly.
Power Transformers maintenance.
Circuit Breaker contact inspection.
Switchgear routine insulation testing.
Preventive maintenance is distinct from 'Breakdown' or 'Corrective' maintenance, which occurs after a fault.
All three listed options are legitimate categories within the preventive maintenance framework.
D is correct — Since routine, periodic, and overhaul procedures are all standard components of a preventive maintenance schedule, none of the options listed are excluded.
In exams, remember that 'Preventive' is proactive (time/condition-based), while 'Corrective' is reactive (failure-based).