CMRP Lubrication Management

Question 1

What is the primary purpose of lubrication in rotating machinery?

Accepted Answer

Reduce friction and wear between moving surfaces

Answer

Lubrication reduces friction and wear between moving surfaces, extending equipment life and improving energy efficiency.

Question 2

Which lubrication delivery method distributes oil to bearings and gears by the action of rotating components contacting an oil sump?

Accepted Answer

Splash lubrication

Answer

Splash lubrication uses rotating components to pick up oil from a sump and fling it onto bearing surfaces through splashing action.

Question 3

A lubricant with a high Viscosity Index (VI) is preferred for equipment with wide temperature swings because it:

Accepted Answer

Maintains relatively stable viscosity across a broad temperature range

Answer

A high VI means viscosity changes less with temperature, ensuring adequate film thickness across the full operating temperature range.

Question 4

Before mixing lubricants from two different manufacturers or product lines, the best practice is to:

Accepted Answer

Verify compatibility through testing or manufacturer guidance

Answer

Incompatible lubricants can cause additive precipitation, sludge formation, or loss of protective properties, so compatibility must be confirmed before mixing.

Question 5

Which grading system is used to classify the consistency (firmness) of grease for bearing applications?

Accepted Answer

NLGI consistency grade

Answer

The NLGI (National Lubricating Grease Institute) consistency grade, ranging from 000 (fluid) to 6 (very stiff), specifies grease firmness for a given application.

CMRP Certified Maintenance and Reliability Professional Practice Practice Test

CMRP Certified Maintenance and Reliability Professional Practice Practice Test

CMRP Lubrication Management