Lubrication Management Flashcards
7 cards from real CMRP practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.
Read the first 7 Lubrication Management flashcards as text
What is the primary purpose of lubrication in rotating machinery?
Answer: Reduce friction and wear between moving surfaces
Lubrication reduces friction and wear between moving surfaces, extending equipment life and improving energy efficiency.
Which lubrication delivery method distributes oil to bearings and gears by the action of rotating components contacting an oil sump?
Answer: Splash lubrication
Splash lubrication uses rotating components to pick up oil from a sump and fling it onto bearing surfaces through splashing action.
A lubricant with a high Viscosity Index (VI) is preferred for equipment with wide temperature swings because it:
Answer: Maintains relatively stable viscosity across a broad temperature range
A high VI means viscosity changes less with temperature, ensuring adequate film thickness across the full operating temperature range.
Before mixing lubricants from two different manufacturers or product lines, the best practice is to:
Answer: Verify compatibility through testing or manufacturer guidance
Incompatible lubricants can cause additive precipitation, sludge formation, or loss of protective properties, so compatibility must be confirmed before mixing.
Which grading system is used to classify the consistency (firmness) of grease for bearing applications?
Answer: NLGI consistency grade
The NLGI (National Lubricating Grease Institute) consistency grade, ranging from 000 (fluid) to 6 (very stiff), specifies grease firmness for a given application.
What is the primary cause of lubricant oxidation during service?
Answer: Prolonged exposure to heat and oxygen
Heat and oxygen are the main drivers of oxidation, breaking down base oil molecules and depleting the additive package, which increases acid content and viscosity.
Which oil sampling practice provides the most representative sample for condition monitoring analysis?
Answer: Draw a sample from a live zone in the system during normal operation
Sampling from a live zone during normal operation captures suspended wear particles and contaminants that reflect true equipment condition, yielding the most actionable data.