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July - August 2020
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17
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. 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.
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:
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
