46
|
March - April 2019
|
www
.
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. A
SAE 10W-30 and SAE 30 are totally different oils. SAE 10W-30 is a multigrade oil in
which
a viscosity-index improver has been added so the oil can be utilized over a wide
range of temperatures. SAE 10W-30 oil works as SAE 10 at cold temperatures and as
SAE 30 at high temperatures.
2. A
Magnetic plug inspections can indicate the presence of ferrous wear (iron and steel).
The magnetic plug will hold ferrous wear particles but not other particles.
3. E
This is an indication that the filter is functioning properly. On the other hand, if the oil
is contaminated and the differential pressure is continuously low, this indicates the
filter is not functioning (perhaps in bypass).
1. What percentage by volume of SAE 10W-30 is SAE 30?
A) 0%
B) 25%
C) 50%
D) 75%
E) 100%
2. Magnetic plug inspections:
A) Crudely indicate presence of iron wear
B) Indicate water contamination
C) Indicate copper wear rates
D) Indicate oil circulation rates
E) Indicate corrosion is occurring
3. A filter's differential pressure slowly increases over
time. What's wrong?
A) e filter has burst
B) e filter bypass valve is open
C) ISO particle counts should be taken
D) Filter differential pressure does not increase
E) Nothing, it's removing dirt
