38
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March - April 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
When bubbles transfer from low to high pressure zones, they implode, producing
intense pressure and surface damage (cavitation wear).
2. C
When storing lubricants outside, it is better to store them horizontally and to cover
them in order to prevent contaminants (particularly water and dust) from entering
the drum through bungs.
3. E
Dissolved water exists when the moisture concentration is below the oil saturation
point (solubility limit). Emulsified water exists when the moisture content is within
or more than the saturation range based on the properties of the oil/water mixture.
Some or all of the water above the solubility limit forms a stable emulsion. Free water
normally appears when moisture content is higher than the saturation point and the
oil has good demulsibility (ability to separate from water).
1. Which wear mechanism involves a collapsing bubble to
do damage?
A) Adhesive wear
B) Erosive wear
C) Cavitation wear
D) Corrosive wear
E) Delamination wear
2. When storing lubricant drums outside, it is best to:
A) Store vertically (with the top surface flat) in the open sunlight
B) Store at an angle with the openings at the high and low positions
C) Store horizontally and covered
D) Cover them with a sheet of plywood
E) Store them upside down
3. Moisture exists in which of the following forms
(related to oils)?
A) Free, dissolved and entrained
B) Dissolved and free
C) Demulsified
D) Entrained and foam
E) Dissolved, emulsified and free
