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May - June 2019
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machinerylubrication.com
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. E
Abrasive wear normally occurs in sliding contact applications. However, it is not
limited to just pure sliding contact. It is seen in all applications where abrasive
particles get between mating surfaces. This includes pistons, cylinders, cams,
rolling-element bearings, gears, etc.
2. D
The best method is to install a sampling valve equipped with a rigid stainless-steel
tube. The tube should be manipulated to be close to the zone of fl uid movement (mid
oil level). A minimum clearance of 2 inches from any dynamic or static surface should
be maintained.
3. E
Visual inspection can indicate oxidation, as oxidized oils tend to be darker. Soot is a
heavy, black substance usually seen at the bottom of a sample bottle. Water contam-
ination also can be easily observed as free water in the bottom of the bottle if the
concentration is high. Other oils tend to emulsify, producing a milky appearance.
1. Abrasive wear occurs where?
A) Pistons/cylinders
B) Cams
C) Rolling-element bearings
D) Gears
E) All of the above
2. Sampling non-circulating, splash/bath machine
sumps is best done by:
A) Drain plug removal
B) Using a fl exible, drop-tube, vacuum sample
C) Using a fl exible, drop-tube, vacuum sample from the bottom of the sump
D) Obtaining a mid oil level sample from a fi xed rigid tube within the sump
E) ese systems should not be sampled
3. Visually checking the color of a used oil sample
can indicate:
A) Oxidation
B) Soot
C) Water contamination
D) A change in base number
E) Answers a, b and c
