Preventive Maintenance Flashcards

Which maintenance strategy uses condition-monitoring data, such as vibration or oil analysis, to schedule repairs before failure?

Answer: Predictive maintenance

Predictive maintenance bases its actions on the measured condition of equipment.

What is the main value of keeping accurate daily operating logs for refrigeration equipment?

Answer: They establish baselines and reveal trends that point to developing problems

Logged readings make it possible to spot abnormal changes early.

An infrared scan of a motor control panel shows one terminal much hotter than the others. What is the likely cause?

Answer: A loose or corroded electrical connection

High resistance at a loose or corroded connection produces localized heating.

Which instrument is used to test the insulation resistance of motor windings during preventive maintenance?

Answer: Megohmmeter

A megohmmeter applies high DC voltage to measure insulation resistance and reveal degradation.

What problem can result from over-greasing an electric motor bearing?

Answer: Overheating and possible seal or winding damage

Excess grease increases friction and heat and can be forced into the windings.

What is the main advantage of a computerized maintenance management system (CMMS)?

Answer: It schedules work orders and tracks maintenance history in one place

A CMMS organizes scheduled tasks, records history, and helps track parts and labor.

Which group of readings is typically recorded on a compressor during an operator's routine log round?

Answer: Suction and discharge pressures, oil pressure, temperatures, and motor amps

These readings show compressor health and system performance.