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Overhauling can be done at the interval of ____________
week
month
month
week
month
Quick Summary: Overhauling is a comprehensive maintenance procedure involving the complete disassembly, cleaning, inspection, and replacement of worn-out components in electrical machinery. For standard electrical power system equipment like transformers and motors, a 6-month interval is considered the industry standard for semi-annual routine overhauls to ensure reliability and longevity.
Overhauling is a comprehensive maintenance procedure involving the complete disassembly, cleaning, inspection, and replacement of worn-out components in electrical machinery. For standard electrical power system equipment like transformers and motors, a 6-month interval is considered the industry standard for semi-annual routine overhauls to ensure reliability and longevity.
MTBF=λ1 — Mean Time Between Failures where λ is the failure rate
MTTR=Number of Repairs∑Repair Times — Mean Time To Repair for maintenance assessment
The maintenance cycle follows a hierarchy: daily checks, monthly inspections, 6-monthly overhauling, and annual shutdowns. Overhauling focuses on detecting fatigue, insulation degradation, and mechanical wear that cannot be identified during routine visual inspection or limited load testing. It involves verifying insulation resistance, checking lubrication levels, cleaning ventilation ducts, and tightening mechanical joints to prevent catastrophic failures.
Overhauling minimizes unplanned downtime by replacing parts before failure.
Critical parameters assessed during overhaul include insulation resistance (MΩ), contact pressure, and dielectric oil strength.
Environment factors (dust, humidity, load cycles) can necessitate shifting the 6-month interval to shorter periods.
Strict adherence to maintenance logs is required for legal and safety compliance in industrial installations.
Increases equipment operational lifespan
Reduces probability of sudden catastrophic failure
Ensures optimum efficiency of the machine
Requires temporary cessation of operations
High labor and replacement part costs
Industrial Transformers
Rotating Machines (Motors/Generators)
Circuit Breakers and Switchgear
The 6-month interval (semi-annual) is the standard maintenance window for deep inspection in IEEE and IEC standards for equipment in medium-duty environments.
Options like 1 week or 3 weeks are generally categorized as daily or weekly routine checks, not comprehensive overhauling.
C is correct — 6 months is the standard interval for performing detailed, scheduled overhauling of critical electrical power system components.
In competitive exams, always distinguish between 'Routine Maintenance' (often monthly/quarterly) and 'Overhauling' (typically 6-monthly or annually); overhauling implies a higher level of disassembly and verification.