ITMC Lubrication 2

Question 1

What does the viscosity index (VI) of an oil indicate?

Accepted Answer

How much the oil's viscosity changes with temperature

Answer

Viscosity index measures how much an oil's viscosity changes with temperature — a higher VI means the viscosity stays more stable across temperature ranges.

Question 2

Which lubrication method continuously delivers oil to a bearing by using a wick or felt pad submerged in an oil reservoir?

Accepted Answer

Wick-feed lubrication

Answer

Wick-feed lubrication uses capillary action through a wick or felt pad to draw oil from a reservoir and deliver it continuously to a bearing surface.

Question 3

What is the primary purpose of an EP (extreme pressure) additive in a lubricant?

Accepted Answer

To prevent metal-to-metal contact under high load conditions

Answer

EP additives react chemically with metal surfaces under high pressure and temperature to form a sacrificial film that prevents metal-to-metal contact and welding.

Question 4

A grease with an NLGI grade of 2 is compared to one with an NLGI grade of 0. Which statement is correct?

Accepted Answer

Grade 2 is stiffer and more commonly used in general bearing applications

Answer

Higher NLGI numbers indicate stiffer grease; NLGI 2 is a medium-firm grease used widely in general-purpose bearing lubrication.

Question 5

During a routine oil analysis, the report shows a high level of silicon in the oil sample. What does this most likely indicate?

Accepted Answer

Dirt or dust is entering the system through a failed seal or breather

Answer

Silicon is a primary indicator of dirt or dust ingression, which typically occurs through failed seals, damaged breathers, or contaminated fill equipment.

(ITMC) Industrial Technology Maintenance Certification Practice Test

(ITMC) Industrial Technology Maintenance Certification Practice Test

ITMC Lubrication 2