Millwright Certification Predictive and Preventive Maintenance 2

Question 1

What is the primary difference between preventive maintenance (PM) and predictive maintenance (PdM)?

Accepted Answer

PM is performed on a fixed schedule, while PdM is performed based on actual equipment condition data

Answer

Preventive maintenance follows a time-based or usage-based schedule regardless of equipment condition, while predictive maintenance uses condition monitoring data to determine when maintenance is actually needed.

Question 2

In vibration analysis, what does a dominant 1x frequency (running speed) in the radial direction typically indicate?

Accepted Answer

Rotor imbalance

Answer

A dominant vibration peak at 1x running speed in the radial direction is the classic signature of rotor imbalance: the heavy spot causes one vibration cycle per revolution.

Question 3

What does infrared thermography detect that is useful for predictive maintenance?

Accepted Answer

Abnormal heat patterns that indicate developing faults like loose connections, bearing wear, or insulation breakdown

Answer

Infrared thermography detects surface temperature patterns that reveal developing problems: hot spots from electrical resistance, overheating bearings, blocked heat exchangers, insulation failures, and steam trap malfunctions.

Question 4

What information does oil analysis provide about equipment condition?

Accepted Answer

Wear metal content, contamination levels, and lubricant degradation that indicate component wear and fluid condition

Answer

Oil analysis identifies wear metals (indicating which components are wearing), contamination types and levels (dirt, water, coolant), and lubricant condition (viscosity, oxidation, additive depletion), providing comprehensive insight into both machine and fluid health.

Question 5

What does MTBF (Mean Time Between Failures) measure?

Accepted Answer

The average operating time between failures for a repairable system, indicating reliability

Answer

MTBF is the average elapsed operating time between failures for a repairable system, calculated by dividing total operating time by the number of failures. Higher MTBF indicates greater reliability.

Blog Practice Test

Blog Practice Test

Millwright Certification Predictive and Preventive Maintenance 2