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. C
PAO base oils have high oxidation stability compared to mineral oils. The additive solubility is
limited because of the high degree of purity (the more refined the base oil, the less solubility
of the additives). Furthermore, PAO base oils are compatible with mineral oils but are not
fire-resistant fluids, so the correct answer is C.
2. B
This is because higher shaft speeds cause more friction and thus increase the oil's tempera-
ture, while lower speeds will not be sufficient to carry enough oil for proper lubrication.
3. D
When an oil container is opened without protection by caps or breathers, the oil becomes
exposed to contaminants such as water, dust, etc. The probability of contamination is high
when the oil is stored for a long period of time. Oil filtration is important when a high degree of
cleanliness is required because new oil does not mean clean oil. The typical ISO cleanliness
code for new oil is 21/19/16, which is very high and not acceptable for systems requiring a
high degree of cleanliness.
1. PAO synthetic base oils:
A) Offer the best additive solubility
B) Are the prime choice for fi re resistance
C) Have better oxidation stability than mineral oils
D) Are incompatible with mineral oils
E) Offer the very best high-temperature stability
2. Slinger rings used in wet sump oil applications:
A) Are a foolproof system of oil supply
B) Must operate in a defi ned range of shaft surface speed
C) Are used to splash oil to all parts of the equipment housing
D) Are always used in gearboxes
E) Are fi rmly attached to the rotating shaft
3. It is a good idea to filter new oil before
putting it into service when:
A) The container has been opened without protection
by caps and breathers
B) A high degree of oil cleanliness is required for
the machine
C) The product has been stored for a long time
D) All of the above
E) Answers A and B
36
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July-August 2015
|
www.machinerylubrication.com
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Answers
1. C
PAO base oils
limited becaus
of the additive
fire-resistant f
2. B
This is becaus
ture, while low
3. D
When an oil c
exposed to co
when the oil is
cleanliness is
code for new
high degree of
