38
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July - August 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. A
Elastohydrodynamic lubrication is a form of hydrodynamic lubrication (full-film
separation). It is called elastohydrodynamic because the lubricated components
deform elastically due to high pressure.
2. C
This ISO cleanliness level (ISO 21/19/16) is considered quite high. Contamination
normally takes place during blending, packaging, storing, transportation, etc.
End users are responsible for checking the quality of incoming oils and taking
measures to ensure clean oil is used, especially in machines that require very
clean oil.
3. C
In hydrolysis, the additives react with water in the presence of heat to form
byproducts such as sulfuric acid and hydrogen sulfides.
1. Which type or form of lubrication is considered to
provide a full fluid (oil) film?
A) Elastohydrodynamic
B) Solid Film
C) Boundary
D) Mixed
E) All of the above
2. A typical ISO cleanliness code for new oil would be?
A) 9/7/5
B) 14/12/10
C) 21/19/16
D) 27/25/21
E) 32/30/27
3. Hydrolysis is the breakdown of additives by:
A) Hydrogen
B) Helium
C) Water
D) Filtration
E) Hydrogen embitterment
