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
An ISO cleanliness code reported as 16/14/11 for a hydraulic fluid describes:
Answer: Particle count ranges per milliliter at 4, 6, and 14 micron size thresholds
The ISO 4406 cleanliness code uses three scale numbers representing particle counts per milliliter at ≥4 µm, ≥6 µm, and ≥14 µm, quantifying solid contamination level.
The primary benefit of an oil analysis program in a reliability-centered maintenance strategy is to:
Answer: Monitor lubricant condition and wear metal trends to enable condition-based maintenance
Oil analysis acts as a 'blood test' for machinery, detecting degradation and wear metal trends that allow maintenance to be triggered by actual condition rather than arbitrary schedules.
Which lubricant additive category forms a protective film on metal surfaces to prevent rust and corrosion from water and acidic contaminants?
Answer: Rust and corrosion inhibitors
Rust and corrosion inhibitors adsorb onto metal surfaces to create a barrier that prevents oxidation and chemical attack from water, acids, and other corrosive agents.
Over-greasing a rolling element bearing most commonly leads to:
Answer: Excessive heat generation from grease churning and bearing failure
Excess grease fills the bearing cavity, forcing rolling elements to churn through grease rather than run freely, generating heat that causes premature bearing failure.
Kinematic viscosity of a lubricating oil, measured in centistokes (cSt), represents:
Answer: The oil's resistance to flow under gravity at a specified temperature
Kinematic viscosity (cSt) is the ratio of dynamic viscosity to fluid density and describes how readily the oil flows under gravitational force at a given temperature.
Oil mist lubrication is the preferred delivery method for high-speed, lightly loaded rolling element bearings primarily because it:
Answer: Delivers minimal oil quantity, reducing churning losses and heat generation
Oil mist delivers a controlled aerosol of fine oil droplets that satisfies lubrication requirements of high-speed bearings while minimizing energy losses and heat from excess lubricant churning.
A steadily increasing Total Acid Number (TAN) trend in sequential oil samples most likely indicates:
Answer: Ongoing oil oxidation and progressive additive depletion
Rising TAN reflects accumulation of acidic oxidation by-products and exhaustion of alkaline additives, signaling that the lubricant is approaching end of service life.