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. E
Kinematic viscosity is measured in the lab using a glass capillary tube and gravity
at both 40 and 100 degrees C. It is also stated in centistokes at 40 degrees C, so
the correct answer is "E."
2. D
The number of particles greater than 3 microns upstream divided by the number
of particles greater than 3 microns downstream equals 200. However, this doesn't
mean all particles less than 3 microns will pass through the filter.
3. E
An oxidation reaction results from the sequential addition of oxygen to the base
oil molecules to form different chemical species including acids. The presence of
oxidation inhibitors helps protect the base oil from oxidation, thus preventing the
formation of organic acids. Oxidation byproducts normally combine to form larger
molecular species, which leads to polymerization. Because viscosity is directly
related to the size of the molecules, any degree of polymerization results in an
increase in viscosity. Oxidation inhibitors are sacrificial like many other additives,
which requires close monitoring. Thus, the correct answer is "E."
1. Kinematic viscosity is commonly:
A) Measured at 40 degrees C
B) Measured at 100 degrees C
C) Determined using a glass capillary tube and gravity
D) Stated in centistokes at 40 degrees C
E) All of the above
2. A Beta(3)=200 filter:
A) Only removes 3-micron particles
B) Only removes particles less than 3 microns
C) Only removes particles greater than 3 microns
D) Removes some particles less than 3 microns
E) Removes particles between 3 and 200 microns
3. Oxidation inhibitors:
A) Help to prevent the formation of acids
B) Help to prevent viscosity increase
C) Are sacrificial and get used up
D) Answers A and B
E) Answers A, B and C
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