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Which activities performed during periodic maintenance in all machine?
Voltage check
Current check
Connection check
Replacement of worn out parts
Replacement of worn out parts
Quick Summary: Periodic maintenance is a scheduled program of inspection and restoration to prevent machine failure. While tasks like voltage and current monitoring are part of daily or operational checks, the physical replacement of worn-out parts based on service life or wear indicators constitutes the core action for maintaining long-term equipment integrity.
Periodic maintenance is a scheduled program of inspection and restoration to prevent machine failure. While tasks like voltage and current monitoring are part of daily or operational checks, the physical replacement of worn-out parts based on service life or wear indicators constitutes the core action for maintaining long-term equipment integrity.
MTBF=λ1 — Mean Time Between Failures, where λ is the failure rate.
Availability=MTBF+MTTRMTBF — Ratio of uptime to total time, highlighting why replacement reduces Mean Time To Repair (MTTR).
The principle relies on the 'Bathtub Curve' of reliability, which identifies the wear-out phase of components. By replacing parts before they reach catastrophic failure, the Mean Time Between Failures (MTBF) is extended and the overall machine availability is maximized.
Preventive maintenance aims to minimize unscheduled downtime.
Worn-out parts replacement is based on manufacturer recommendations or condition monitoring.
Electrical checks (voltage/current) are monitoring tasks, whereas part replacement is restorative.
Reduces the probability of cascading failures in complex systems.
Increased equipment lifespan
Enhanced operational safety
Reduction in emergency repair costs
Scheduled downtime required
Cost of spare parts inventory
Potential for human error during disassembly
Industrial motor maintenance
Power transformer bushing replacement
Bearing lubrication and renewal
Options A, B, and C describe diagnostic monitoring activities that determine the need for maintenance, while D describes the actual corrective activity performed during the maintenance window.
Maintenance schedules are often determined by the 'Run-to-failure' vs 'Time-based' vs 'Condition-based' methodologies.
D is correct — The replacement of worn-out parts is the definitive physical activity performed during periodic maintenance to restore the machine to its design capability.
Always distinguish between monitoring/inspection (finding a problem) and maintenance/overhaul (fixing the problem). Exam questions often use monitoring activities as distractors.