CMRT CMRT Lubrication and Tribology 2

Question 1

Which contamination type is considered the number one destroyer of lubricated components in industrial machinery?

Accepted Answer

Solid particle contamination

Answer

Water contamination

Answer

Air entrainment

Answer

Oxidation byproducts

Question 2

What does the ISO cleanliness code (e.g., ISO 16/14/11) measure in oil analysis?

Accepted Answer

The number of particles per milliliter at three different size thresholds

Answer

The concentration of additive packages in the lubricant

Answer

The oxidation stability rating of the lubricant

Answer

The percentage of water contamination in the oil

Question 3

What is the primary advantage of using synthetic lubricants over conventional mineral oils in high-temperature applications?

Accepted Answer

Synthetic oils offer better oxidation stability and wider operating temperature ranges

Answer

Synthetic oils are always less expensive than mineral oils

Answer

Synthetic oils require more frequent change intervals

Answer

Synthetic oils are universally compatible with all seal materials

Question 4

What is 'over-greasing' a bearing and why is it harmful?

Accepted Answer

Applying excessive grease that causes elevated temperatures, churning, and premature bearing failure

Answer

Applying grease too frequently but in small quantities, which is actually beneficial

Answer

Using a grease with too high a viscosity for the application

Answer

Mixing incompatible grease types in the bearing housing

Question 5

Which property of a lubricant is described by its 'flash point'?

Accepted Answer

The lowest temperature at which the oil vaporizes sufficiently to ignite briefly when exposed to a flame

Answer

The temperature at which the oil ignites and sustains combustion

Answer

The temperature at which the oil begins to oxidize rapidly

Answer

The temperature at which the oil loses all lubricating properties

Question 6

What does a rising trend of iron (Fe) particles in an oil analysis report most likely indicate?

Accepted Answer

Wear occurring in iron or steel components such as gears, bearings, or cylinder walls

Answer

Normal lubricant additive depletion

Answer

Contamination from the external environment

Answer

Oxidation of the base oil