Ramsay Test Lubrication

Question 1

Which type of lubricant is most appropriate for a high-speed ball bearing operating at elevated temperatures?

Accepted Answer

High-temperature bearing grease (NLGI Grade 2 or 3)

Answer

EP (Extreme Pressure) gear oil

Answer

Penetrating oil

Answer

Hydraulic fluid

Question 2

NLGI grease consistency grades (000 through 6) measure which property?

Accepted Answer

The stiffness or consistency of the grease

Answer

The viscosity of the base oil in the grease

Answer

The dropping point temperature of the grease

Answer

The percentage of thickener by weight

Question 3

A pillow-block bearing housing feels unusually hot and grease is purging out of the seals. The most likely cause is:

Accepted Answer

Over-greasing causing churning and heat buildup

Answer

Insufficient lubrication — the bearing is running dry

Answer

Water contamination in the grease

Answer

The wrong NLGI grade — grease is too thin

Question 4

What is the primary function of Extreme Pressure (EP) additives in gear oil?

Accepted Answer

To form a protective chemical layer on gear teeth under high load and shock

Answer

To raise the viscosity index so the oil thins less with temperature

Answer

To lower the pour point for cold-weather startup

Answer

To prevent oxidation of the oil during storage

Question 5

A technician finds that grease in a bearing has turned black and smells burnt. The most likely cause is:

Accepted Answer

Thermal degradation from overheating beyond the grease's service temperature

Answer

Normal darkening from extended service intervals

Answer

Water contamination from washdown operations

Answer

Mixing of incompatible grease types

Question 6

When establishing a relubrication schedule for a bearing, which factor has the GREATEST influence on the interval?

Accepted Answer

Bearing speed (RPM) and operating temperature

Answer

The color of the existing grease

Answer

The brand of grease being used

Answer

The diameter of the grease fitting (zerk)