Lubrication Systems and Practices Flashcards
6 cards from real Millwright Certification practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.
Read the first 6 Lubrication Systems and Practices flashcards as text
What is oil analysis primarily used for in a predictive maintenance program?
Answer: Detecting wear particles, contamination, and oil degradation to predict component failure
Oil analysis detects metallic wear particles, contamination, and changes in oil chemistry that indicate developing faults before catastrophic failure occurs.
The purpose of EP (Extreme Pressure) additives in gear oils is to:
Answer: Form a protective layer on metal surfaces under high-load, boundary-lubrication conditions
EP additives chemically react with metal surfaces under extreme pressure and temperature to form a sacrificial layer that prevents metal-to-metal contact and scoring.
When using a grease gun to lubricate a bearing, the correct technique to prevent over-pressurizing the seal is to:
Answer: Apply grease slowly while watching for relief through the purge fitting or drain plug
Slow application while monitoring the purge fitting allows old grease to be displaced safely without building pressure that could blow out bearing seals.
What is the function of a magnetic drain plug in a gearbox?
Answer: To capture ferrous metal wear particles from the oil for inspection
Magnetic drain plugs attract and hold ferrous particles worn from gears and bearings, allowing a millwright to monitor wear debris during oil changes.
Which statement about mixing different brands of grease is correct?
Answer: Different greases should never be mixed without checking thickener compatibility to avoid softening or hardening
Mixing incompatible grease thickeners (e.g., lithium with calcium complex) can cause the mixture to soften, bleed oil, and lose consistency, resulting in bearing failure.
A sight glass (bull's-eye) on a gearbox housing is used to:
Answer: Check and maintain correct oil level
A sight glass allows a millwright to visually verify the oil level in the sump is within the correct operating range without draining or opening the gearbox.