38
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July - August 2014
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www.machinerylubrication.com
ML
Answers:
1. E
Polyolester synthetic lubricants are considered to be members of API Group V. Polyolesters
have excellent low-temperature properties, good lubricating properties and low volatilities.
2. C
Live-zone sampling means avoiding stagnant oil in any dead leg within the system. However,
it is important to ensure that the flow in the live sampling zone is highly turbulent. Elbows and
sharp bends are good examples of high turbulence areas. Sampling from a laminar flow area
(straight line) results in a substantial reduction in particle concentration entering the sample
bottle because of particle fly-by.
3. D
Oil will be less viscous at high temperatures, which can help to drain the maximum amount of
oil. In addition, oil at high temperatures has better solubility, so it can hold more contaminants
and degradation byproducts that need to be removed with the oil change.
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. Polyolester synthetic lubricants are considered
members of what API Group?
A) I
B) II
C) III
D) IV
E) V
2. Live-zone sampling a circulating oil system means:
A) Always using a live sample pump to take the sample
B) Taking a sample from a static (non-flowing) straight piece of pipe in laminar flow
C) Taking a representative sample from a flow line that contains flowing oil
D) Taking a sample hot
E) Taking a sample from a zone in the system that contains the most wear debris
3. The proper time to drain the oil from a gearbox is:
A) At the end of the shift
B) At the end of the day
C) At the beginning of the following shift
D) While it is still hot from operation
E) After it has cooled and the particles and water have settled
near the bottom
