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. C
The ISO solid contaminant code is useful in characterizing the concentration of
solid particles in a lubricant. The current ISO solid contamination code provides
particle counts for particles larger than 4, 6 and 14 microns.
2. E
Additives are added to base oil to enhance existing properties (examples include anti-
oxidants, corrosion inhibitors, anti-foam and demulsifying agents); suppress existing
undesirable properties (pour point depressants and viscosity index improvers are
good examples); and add new properties (examples would be extreme-pressure and
anti-wear additives, detergents and metal deactivators).
3. C
A centistoke, which is the unit of kinematic viscosity, is equal to mm
2
/second. Kine-
matic viscosity is dynamic viscosity (centipoise) divided by the specific gravity
of the fluid. SUS stands for Saybolt Universal Seconds, which is another unit to
measure viscosity. The SUS viscosity measurement method has largely been
replaced by the kinematic viscosity method.
1. The ISO solid contaminant code:
A) Is a means to characterize the chemical composition of debris found in the lubricant
B) Is useful as a means to accurately state the concentration of dirt in a lubricant
C) Is useful as a means to characterize the concentration of solid particles in a lubricant
D) Is the most useful condition-based measure to gauge oil life
E) Is a means of characterizing the type of solid contaminant
2. Additives:
A) Enhance existing base oil properties
B) Suppress undesirable base oil properties
C) Add new properties that the base oil cannot provide
D) Answers A and B only
E) Answers A, B and C
3. Which two viscosity units are identical: centistokes, centi-
poise, SUS and mm
2
/second?
A) Centistokes and centipoise
B) Centistokes and SUS
C) Centistokes and mm
2
/second
D) Centipoise and mm
2
/second
E) Centipoise and SUS
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March - April 2017
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