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.
TEST YOUR KNOWLEDGE
Answers
1. D
A tank should be cleaned/flushed to avoid contaminating the new oil. Sludge
and other deposits are oxidation byproducts. Some of these deposits work as
pro-oxidants that attack the antioxidant additives of the new oil, resulting in the
rapid depletion of these important additives. Consequently, the base oil will be
unprotected and become oxidized in a short period of time.
2. A
Block grease represents the highest NLGI consistency. The NLGI number for block
grease is 6. It is as hard as cheddar cheese spread.
3. A
Below the saturation point, there will be no visible or audible change. Above the
saturation point, bubbles and audible crackling will be noticed based on water and/
or other volatile substance concentration.
1. When should the reservoir be cleaned/flushed?
A) Every time the oil is changed.
B) When the plant is in a shutdown.
C) When the system fluid viscosity changes by 7 percent or more.
D) When sludge and deposits are detected at the oil drain.
E) When the breather is changed.
2. Which of the following represents the highest NLGI consistency?
A) Block grease
B) ISO 460
C) 000
D) 18/16/13
E) 8
3. A crackle test can only detect water above:
A) The saturation point, which depends on oil type and temperature
B) 100 ppm
C) 1,000 ppm
D) 10,000 ppm
E) 1 percent
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