Machinery Lubrication India Jan Feb 14 10 | Page 22

MLI

TEST your
KNOWLEDGE
This month, Machinery Lubrication India 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 please contact the editor.

1. Water separation from oil (demulsibility):
A) Can be roughly determined with a kitchen blender.
B) Cannot be determined in the field.
C) Can be determined using a patch test.
D) Is not important enough to worry about with a field test.
E) Can be determined using a calcium hydride kit.

2. FTIR can provide reliable information on:
A) Oxidation and soot
C) Viscosity and acid number
E) Oil density

B) Wear metals
D) Particle counts

3. The benefit that is achieved with the use of a
e
hard-piped sampling valve (minimess) is:

From page 16

20| January-February 2014 | www.machinerylubricationindia.com

Answers:
1. A
The test can be prepared easily by
mixing the used oil sample with water
at room temperature. The mixture
should be blended for 2 minutes at high
blending speed and then poured into a
graduated cylinder. Demulsibility can
be assessed by evaluating the oil zone,
cuff zone and water zone after a certain
period of time.
2. A
FTIR is an effective tool to monitor
multiple oil parameters such as oxidation, soot, nitration, glycol, etc. There
are special instruments to measure
wear metals, viscosity, acid number,
particle counts and oil density.
3. E
A minimess sampling valve is ideal
because the amount of dead volume
(stagnant oil) in this type of sample
port is minimal. Therefore, flushing
is easy and does not require draining
large amounts of oil. This type of
sample port is designed to prevent
leakage and is normally clean because
of the threaded dust ca

A) Dead volume is minimized
B) Flushing is easy to do
C) Sampling is clean due to the threaded dust cap
D) There is low risk of leakage
E) All of the above