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. Adhesive wear can be described as:
A) The adhesion of wear debris to a layer
of varnish
B) The adhesion of a layer of oil to the
metal surface
C) The transfer of silicon particles from
one metal surface to another
D) The transfer of metal from one
surface to another through a localized welding process
E) None of the above
2. Oil samples from an off-line (kidney-loop) filtration circuit should be taken:
A)
B)
C)
D)
E)
Downstream of the pump, upstream of the filter
Downstream of the reservoir, upstream of the pump (before the pump)
Downstream of the filter
From the sump
From the drain plug
3. Compatibility of different greases:
A) Is only a minor issue and often can be ignored
B) Is a major issue that is dependent on the
thickener used
C) Is independent of the thickeners used
D) Can be linked to the age of the grease involved
E) Is dependent only on the base oil used
3. B
Compatibility of different greases is a serious issue that mainly depends on the thickener
type. In general, most grease thickeners are incompatible, so extreme caution is required
when switching from one grease type to another.
2. A
This is to assess the actual condition of the oil before it gets filtered.
Answers:
1. D
Other names for adhesive wear include galling, scuffing, seizing and severe sliding. Adhesive
wear normally occurs during machine starts, loss of film strength and overload/overspeed
conditions. Proper lubricant selection is essential to control this wear mode.
32 |
November - December 2013 | www.machinerylubrication.com
