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. B
The major limitation of atomic emission spectroscopy is that it can only measure particles
less than approximately 5 microns in size depending on particle composition and the type of
spectrometer. This is why you can see some visible particles in a sample bottle and get no
indication of particles in the oil analysis report. Running other test methods such as ferrog-
raphy is required to quantify and identify the source of large particles.
2. E
More frequent sampling is required when the equipment is new and old. This is because of
the high failure probability in these periods. The more critical the machine, the more frequent
sampling is required. More frequent sampling is also needed when the oil becomes old. This
is because the worse it gets, the faster it deteriorates. Operating conditions can include many
factors such as high loads, extreme temperatures, harsh environments, etc. Severe operating
conditions require more sampling.
3. B
The percent capture efficiency is ((beta – 1)/beta) x 100. In this case, beta is 200, so the
efficiency equals (199/200) x 100 or 99.5 percent.
1. In typical use, atomic emission spectroscopy (AES)
(or elemental analysis) has which significant limitation?
A) It cannot detect the most important wear metals.
B) It can only detect wear debris particles less than approximately 5
microns in size.
C) It can only detect wear debris particles less than 12 microns in size.
D) It can only detect additive elements.
E) It can only detect large iron wear debris.
2. Oil sampling frequencies may be affected by:
A) Machinery age
B) Machine criticality
C) Fluid (oil) age
D) Operating conditions
E) All of the above
3. A beta ratio of 200 means that the filter
is how efficient?
A) 200 percent
B) 99.5 percent
C) 98.7 percent
D) 90 percent
E) 50 percent
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January - February 2015
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