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. A
In general, the Pareto Principle states that, for many events, roughly 80 percent of
the effects come from 20 percent of the causes, so the correct answer is A.
2. D
PAG oil offers marginal additive solubility. While it is fire-resistant when combined
with water (water-glycol), it is not the prime choice for fire-resistant fluids. (Phos-
phate ester is the prime fire-resistant choice.) PAG has a totally different structure
than
mineral oil. It offers high-temperature stability, but it is not the best high-tem-
perature option. For instance, ester-based fluids have higher temperature stability
than
PAG. PAG oils also are incompatible with mineral oil, so the correct answer is D.
3. A
The correct range is from 0.1 to 30 percent. It differs based on the application. For
example, steam turbine and compressor oils contain 0.5 to 5 percent additives,
which mainly represent antioxidants, anti-foam agents, demulsifiers and corrosion
inhibitors. However, the percentage may reach 30 percent in the case of engine
oils, which include antioxidants, anti-foam agents, corrosion inhibitors, detergents,
dispersants, anti-wear additives, etc.
1. The Pareto Principle (80/20 Rule) states:
A) The largest beneficial effect is obtained from a critical few maintenance tasks
B) The largest beneficial effect is obtained from the (random) many
maintenance tasks
C) All machines die sometime
D) All bearings live forever
E) 80 percent of the people do 20 percent of the work
2. Polyalkylene glycol (PAG) synthetic oils:
A) Offer the best additive solubility
B) Are the prime choice for fire-resistant fluids
C) Are a copy of the best structure found in mineral oils
D) Are incompatible with mineral oils
E) Offer the very best high-temperature stability
3. The amount of additives in a finished oil can range from:
A) 0.1 to 30 percent
B) 0 to only 10 percent
C) 10 to 50 percent
D) 1 to only 10 percent
E) 10 to 30 percent
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January - February 2016
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