www.machinerylubrication.com
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January - February 2017
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31
THIS MONTH, MACHINERY LUBRICATION CONTINUES
ITS "TEST YOUR KNOWLEDGE" SECTION in which we
focus on a group of questions from Noria's Practice Exam for
Level I Machine Lubrication Technician and Machine Lubricant
Analyst. The answers are located at the bottom of this page. The
complete 126-question practice test with expanded answers is
available at store.noria.com.
TEST YOUR KNOWLEDGE
Answers
1. A
The higher the value, the dirtier the oil. On average, the number of particles in each
ISO code range is double the number of particles in the previous one. For example,
on average ISO 19/17/14 is two times dirtier than ISO 18/16/13.
2. B
Additives can be depleted due to decomposition where the additive molecules change
irreversibly as in oxidation, thermal degradation, hydrolysis, etc. Another cause of
additive depletion is adsorption in which additives adhere to machine surfaces or
take a ride on particles or water. This is due to the fact that some additives are polar
and are attracted by other polar elements.
3. E
As per ISO 3448 viscosity classification, the ISO viscosity grades are 2, 3, 5, 7, 10,
15, 22, 32, 46, 68, 100, 150, 220, 320, 460, 680, 1,000 and 1,500 centistokes at 40
degrees C. Since 180 centistokes at 40 degrees C is not among them, the correct
answer is E. Each subsequent viscosity grade (VG) within the classification has
approximately a 50-percent higher viscosity.
1. With regard to the ISO cleanliness code system:
A) The higher the value, the dirtier the oil
B) The higher the value, the cleaner the oil
C) The target value should be 200-400 ppm
D) The target value should be as high as possible
E) This is only useful to monitor new oil purchases
2. Additives can become depleted by:
A) Oil flow
B) Decomposition and adsorption onto metal surfaces
C) Water evaporation
D) High pressure
E) They are not depleted
3. An oil's viscosity is measured to be 180 centistokes (cSt) at 40
degrees C. Which ISO grade is it?
A) 150
B) 180
C) 220
D) 180 ± 10 percent
E) None of the above
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