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42
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November - December 2018
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www
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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. B
High soot loading is controlled by dispersant additives. This type of additive is polar
and is used to disperse soot particles in order to prevent agglomeration. Dispersant
additives envelop particles and keep them divided.
2. C
This test is extremely simple and inexpensive. It involves placing two drops of used
oil on chromatography paper. When the oil makes contact with the absorbent blotter
paper, it will wick out into the paper. Once all the oil has moved into the pores of the
paper, the blotter is ready to be examined. This test is primarily used to detect the
accumulation of particles, soot and organic insolubles such as sludge and other oxida-
tion byproducts. It is also a good tool to assess the condition of oil dispersants.
3. B
A sample bottle should be fi lled to enable enough agitation by lab personnel to
assess the contaminants and wear metal contents. Otherwise, contaminants and wear
metal will stay in the bottom of the sample bottle and will not be measured, making
the sample unrepresentative. In addition, a sample bottle that is fi lled less than 75
percent may be insuffi cient to perform all the required tests.
1. High soot loading is managed by what additive?
A) ZDDP
B) Dispersant
C) Over-base detergent
D) AW/EP
E) Demulsifi er
2. The blotter spot test is primarily used to detect:
A) Silicone sealant
B) Viscosity increase
C) Particles, soot and organic insolubles
D) Air entrainment
E) Spent additives
3. For a typical hydraulic fl uid, how full should a sample
bottle be fi lled with hydraulic fl uid?
A) 50 percent
B) 75 percent
C) 90 percent
D) 100 percent
E) It doesn't matter
