38
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January - February 2014
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www.machinerylubrication.com
ML
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.
1. Which statement is incorrect regarding filter
patch tests for solid contaminants?
A) Patch tests use very fine micron filters
B) The patch test is a form of automatic particle counting
C) Patch tests can be done in-house or in a lab
D) Patch discoloration can estimate overall particle
concentration
E) The resulting patch can be viewed or weighed to assess
the contaminant concentration
2. Which of the following is the single most important property of a lubricant?
A) Viscosity
B) Dropping point
C) Worked separation
D) Base oil type
E) Acid number
3. Drop-tube vacuum sampling of reservoirs and tanks is best done:
A) Off the bottom of the tank
B) Where the oil return line dumps back into the tank
C) Where the oil suction line pulls oil from the tank
D) From the top layer of the oil in the tank where
water and dirt have settled out
E) From the middle of the tank
Answers:
1. B
The filter patch test is a simple test used to evaluate solid particles where the oil passes through a
fine filter. All listed choices are correct except "B," as there is no automatic particle counting involved
in this simple test.
2. A
Viscosity is the most important property of a lubricant. While other properties are significant, the wrong
viscosity selection may lead to serious problems in a short amount of time, including metal-to-metal contact
if the viscosity is too low or high temperature and its associated problems if the viscosity is too high.
3. B
This will help detect wear metals generated from system frictional zones before the oil becomes
diluted in the tank.
tEst
your
KnowlEdgE
38
|
January - February 2014
|
www.machinerylubrication.com
