ML
TEST your
KNOWLEDGE
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.
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 flexible, drop-tube, vacuum sample
C) Using a flexible, drop-tube, vacuum sample from the bottom of the sump
D) Obtaining a mid oil level sample from a fixed rigid tube within the sump
E) These 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
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 contamination 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.
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 fluid movement (mid oil level). A minimum clearance of 2 inches
from any dynamic or static surface should be maintained.
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.
Answers:
24 |
May - June 2013
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