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. E
An increase in acid number is an indication that the antioxidant level is not able to neutralize
or capture free radicals within the oil. AES is effective in monitoring the concentration of
additives such as anti-wear (AW), extreme pressure (EP), detergents, etc. Voltammetry is
used to monitor antioxidant additives such as aromatic amine and phenolic inhibitors. FTIR is
utilized to monitor many additives by comparing used oil to new oil of the same formulation.
2. C
From a safety and reliability perspective, this is why extreme caution is required when using
grease guns. Seal damage is a common problem when using such high-pressure grease guns.
3. E
Oil appears cloudy when the moisture content is within or more than the solubility limit of the
oil. The cloudiness of the oil due to water varies from oil to oil, based on viscosity, demul-
sibility and other factors.
1. Additive depletion can be monitored with:
A) Acid number
B) Atomic emission spectroscopy (AES)
C) Voltammetry
D) Fourier transform infrared (FTIR) spectroscopy
E) All of the above
2. Some grease guns can generate
up to what pressure?
A) 200 psi
B) 2,000 psi
C) 15,000 psi
D) 50,000 psi
E) 200,000 psi
3. What percentage of rolling bearing life can be lost before
the oil develops a cloudy appearance due to water?
A) 25%
B) 50%
C) 75%
D) 90%
E) Cannot be determined without more information such as the lubricant type
34 November - December 2014
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www.machinerylubrication.com
