44
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May - June 2018
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www
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machinerylubrication.com
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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. C
Grease consistency is the ability of grease to resist deformation by an applied
mechanical force (cone penetrometer). The higher the cone penetration, the
softer the grease and vice versa.
2. A
Oil oxidation is the reaction of oil hydrocarbons with oxygen. It shortens the life
of the oil and results in the formation of acids and sludge. The oxidation rate
increases as the temperature increases. For every 18 degrees F (10 degrees C),
the oxidation rate is doubled and the life of the oil is cut in half (Arrhenius rate
rule). Therefore, "A" is the correct answer.
3. B
This information represents the Society of Automotive Engineers (SAE)
viscosity grade.
1. A cone penetrometer is used to measure what?
A) Dropping point
B) Remaining useful life
C) Grease consistency
D) Oxidation stability of grease
E) Bleed characteristics
2. Which is not correct related to oxidation?
A) Is the reaction of oxygen with water to form acids
B) Creates acid and sludge
C) Occurs at all oil temperatures but becomes significant above
60 degrees C (150 degrees F)
D) Is the reaction of oil hydrocarbons with oxygen
E) Shortens oil life
3. The information in the center of the API "donut"
symbol on motor oil containers represents what?
A) Service classification
B) Viscosity grade
C) Energy-conserving capabilities
D) AW additive
E) Base oil type