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. C
An anti-foam additive is a suspended micro-globule additive that is not dissolved.
It normally subsides in the bottom of oil containers during prolonged storage,
which necessitates proper storage and handling practices.
2. D
Halfway up the lower rollers on the bearings is the correct level in most cases. More
or less oil may lead to problems. When the oil level is low, the bearing will not receive
enough lubricant for proper film strength, which can result in high temperature,
metal-to-metal contact and possible failure. When the oil level is high, churning
of the lubricant will occur, accelerating the oxidation rate due to excessive air and
elevated temperatures.
3. A
The base number is an important parameter to monitor, especially for engine oils.
Engine oil is alkaline (basic) because it is fortified with detergent additives to control
deposits and neutralize acids generated during combustion. As the oil ages, these
types of additives are used up, leading to a decrease in the base number.
1. Which additive is not fully dissolved in the (mineral) oil?
A) Antioxidant
B) Anti-wear (ZDDP)
C) Anti-foam (silicone)
D) Anti-rust
E) Viscosity index improver
2. Constant-level oilers:
A) Work through capillary action
B) Cannot be set to the wrong oil level
C) Prevent water contamination of the oil
D) Should be set with the oil level halfway up
the lower rollers on bearings
E) Contain a wing-nut level adjuster that can be
thrown away
3. After some possible initial change, as oil ages, the base
number of an oil generally:
A) Trends down
B) Trends up
C) Stays very flat
D) Oscillates both up and down
E) None of the above
Twiter
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July - August 2016
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