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January - February 2020
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machinerylubrication.com
TEST YOUR KNOWLEDGE
This month, Machiner y Lubrication continues it s " Test Your Knowledge" sec tion in which we focus on a group of questions from Noria's
Prac tice 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 prac tice test with expanded answers is available at store.noria.com.
ANSWERS
1. 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.
2. 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.
3. B
This
will help detect wear metals generated from system frictional zones before the
oil becomes diluted in the tank.
1. 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
2. Which statement is incorrect regarding filter patch
tests for solid contaminants?
A) Patch tests use very fine micron filters
B) e 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) e resulting patch can be viewed or weighed to assess the contaminant
concentration
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
