CMRP Lubrication Management 2

Question 1

An ISO cleanliness code reported as 16/14/11 for a hydraulic fluid describes:

Accepted Answer

Particle count ranges per milliliter at 4, 6, and 14 micron size thresholds

Answer

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.

Question 2

The primary benefit of an oil analysis program in a reliability-centered maintenance strategy is to:

Accepted Answer

Monitor lubricant condition and wear metal trends to enable condition-based maintenance

Answer

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.

Question 3

Which lubricant additive category forms a protective film on metal surfaces to prevent rust and corrosion from water and acidic contaminants?

Accepted Answer

Rust and corrosion inhibitors

Answer

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.

Question 4

Over-greasing a rolling element bearing most commonly leads to:

Accepted Answer

Excessive heat generation from grease churning and bearing failure

Answer

Excess grease fills the bearing cavity, forcing rolling elements to churn through grease rather than run freely, generating heat that causes premature bearing failure.

Question 5

Kinematic viscosity of a lubricating oil, measured in centistokes (cSt), represents:

Accepted Answer

The oil's resistance to flow under gravity at a specified temperature

Answer

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.

CMRP Certified Maintenance and Reliability Professional Practice Practice Test

CMRP Certified Maintenance and Reliability Professional Practice Practice Test

CMRP Lubrication Management 2