32
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January - February 2018
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machinerylubrication.com
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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. D
Wear is the primary cause of machinery replacement. Surface degradation of the
metal includes all types of wear such as abrasion, adhesion, erosion, corrosion, etc.
2. C
This will help assess the actual condition of the oil and the engine before the contami-
nants and wear metals are captured by the filter.
3. C
EHL occurs in systems where the contact area is small and the pressure is high, such
as rolling-element bearings, gears (at the pitch line) and cams. The mating surfaces
deform elastically to enlarge the contact area, which is why it is called elastohydrody-
namic lubrication.
1. The primary reason that machinery is replaced is due to:
A) Erosion
B) Accidents
C) Obsolescence
D) Surface degradation of the metal
E) Corrosion
2. Sampling crankcase oil from an engine should be done:
A) rough the dipstick hole with a drop-tube
B) From a valve mounted after the pump and after the filter
with the engine running
C) From a valve mounted after the pump, before the filter with
the engine running
D) From a valve mounted after the pump, before the filter
with the engine shut off
E) From the drain plug
3. Elastohydrodynamic lubrication (EHL) is considered
to occur primarily in:
A) Piston rings and liners
B) Journal bearings
C) Rolling bearings, gears and cams
D) Slow-moving pins and bushings
E) Worm gears