ML
TEST your
KNOWLEDGE
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. Water separation from oil (demulsibility):
A) Can be roughly determined with a kitchen blender.
B) Cannot be determined in the field.
C) Can be determined using a patch test.
D) Is not important enough to worry about with a field test.
E) Can be determined using a calcium hydride kit.
2. FTIR can provide reliable information on:
A) Oxidation and soot
B) Wear metals
C) Viscosity and acid number
D) Particle counts
E) Oil density
3. The benefit that is achieved with the use of a hard-piped sampling valve
(minimess) is:
A) Dead volume is minimized
B) Flushing is easy to do
C) Sampling is clean due to the threaded dust cap
D) There is low risk of leakage
E) All of the above
3. E
A minimess sampling valve is ideal because the amount of dead volume (stagnant oil) in this
type of sample port is minimal. Therefore, flushing is easy and does not require draining large
amounts of oil. This type of sample port is designed to prevent leakage and is normally clean
because of the threaded dust cap.
2. A
FTIR is an effective tool to monitor multiple oil parameters such as oxidation, soot, nitration,
glycol, etc. There are special instruments to measure wear metals, viscosity, acid number,
particle counts and oil density.
Answers:
1. A
The test can be prepared easily by mixing the used oil sample with water at room temperature.
The mixture should be blended for 2 minutes at high blending speed and then poured into a
graduated cylinder. Demulsibility can be assessed by evaluating the oil zone, cuff zone and water
zone after a certain period of time.
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September - October 2013 | www.machinerylubrication.com
