CLS Grease Technology & Application

Question 1

What is the primary function of a thickener in lubricating grease?

Accepted Answer

To act as a sponge-like structure that holds the base oil

Answer

To lower the oil's viscosity

Answer

To increase the flash point of the grease

Answer

To neutralize acidic contaminants

Question 2

Which NLGI grade is most commonly used for general-purpose bearing lubrication in most industrial applications?

Accepted Answer

NLGI 2

Answer

NLGI 00

Answer

NLGI 1

Answer

NLGI 4

Question 3

What does the dropping point of a grease indicate?

Accepted Answer

The temperature at which the grease loses its structure and becomes liquid

Answer

The minimum temperature at which the grease can be pumped

Answer

The temperature at which the grease begins to bleed oil

Answer

The maximum load the grease can support

Question 4

Which thickener type is generally considered incompatible with most other thickener types?

Accepted Answer

Polyurea

Answer

Lithium complex

Answer

Calcium sulfonate

Answer

Bentone (clay)

Question 5

What is the purpose of EP (Extreme Pressure) additives in grease?

Accepted Answer

To form a protective film on metal surfaces under high load and shock conditions

Answer

To reduce grease bleeding at high temperatures

Answer

To increase the NLGI grade of the grease

Answer

To improve the grease's resistance to water washout

Question 6

When is re-greasing of a bearing most appropriately performed in a continuous operation?

Accepted Answer

While the equipment is running so old grease can be purged

Answer

Only when the bearing is cold and the equipment is shut down

Answer

During annual scheduled shutdowns only

Answer

Immediately after a contamination event regardless of interval

Question 7

What property does Oil Separation (bleed) test measure in a grease?

Accepted Answer

The tendency of base oil to separate from the thickener over time

Answer

The rate at which grease absorbs water

Answer

The grease's resistance to shear degradation

Answer

The evaporation rate of the base oil