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Examoogle • User • info@examoogle.com • EE-2024-8821
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In routine maintenance which activities performed?
Re-varnishing
Drying
Lubrication
Alignment
Lubrication
Quick Summary: Routine maintenance refers to day-to-day, periodic tasks performed to ensure equipment operates reliably and prevents premature failure. Lubrication is a fundamental routine maintenance activity designed to reduce friction, wear, and heat dissipation in moving mechanical parts of electrical machinery.
Routine maintenance refers to day-to-day, periodic tasks performed to ensure equipment operates reliably and prevents premature failure. Lubrication is a fundamental routine maintenance activity designed to reduce friction, wear, and heat dissipation in moving mechanical parts of electrical machinery.
Ff=μN — Represents frictional force where μ is the friction coefficient and N is the normal load.
In rotating electrical machines, lubrication maintains a thin film of oil or grease between metal surfaces. This prevents metal-to-metal contact, which minimizes the friction coefficient (μ) and prevents overheating, thereby extending the lifespan of bearings and related components.
Routine maintenance is preventive, not breakdown-based.
Lack of lubrication is the primary cause of mechanical bearing failure in motors.
Maintenance schedules are typically based on operating hours or elapsed time intervals.
Electrical maintenance focuses on both mechanical (lubrication) and electrical (insulation) health.
Reduces unexpected equipment downtime
Increases the Mean Time Between Failures (MTBF)
Ensures safer operation of rotating machinery
Requires scheduled labor costs
Over-lubrication can damage seals or contaminate windings
Industrial Induction Motors
Transformers (Oil filtration/lubrication)
Circuit Breaker Operating Mechanisms
Re-varnishing is considered preventive or corrective maintenance performed during overhauling, not routine tasks.
Alignment is a precision maintenance task performed after installation or major repairs.
Drying of windings is generally a corrective action taken after moisture ingress (Megger test failure).
C is correct — Lubrication is a essential routine task performed at scheduled intervals to minimize friction and wear in the bearings of rotating electrical machinery.
In competitive exams, always distinguish between 'Routine' (day-to-day/periodic) and 'Overhaul' (extensive, major) maintenance tasks to avoid common traps.