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MLT I & MLA I Certification Review.
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- 126 MTTC English As A Second Language
MLT I & MLA I Certification Review.
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MLT I & MLA I Certification ReviewParaffinic has the highest VI. Naphthenic has the lowest pour point. - ANS-Name the
two most common types of mineral-based oils. Which would have the highest VI? Which
would have the lowest pour point?
Temperature in degrees Celsius - ANS-What unit of measure is used with flash point
and pour point?
Lower - ANS-Is the specific gravity of a mineral oil typically higher or lower than
synthetic lubricants?
PAO - ANS-Which has a higher VI, a PAO or a solvent-refined (Group 1) mineral or oil?
It goes up - ANS-When and oil oxidizes, how does its viscosity typically change?
Winter - ANS-In the SAE crankcase viscosity classification 0W-30, what does the W
stand for?
SAE 0W-30 - ANS-Of the following motor oil's, which are oil is best suited for coldstart
conditions?
SAE 15W-50
SAE 40
SAE 20
SAE 0W-30
SAE 30 - ANS-When a SAE 20 is blended with an SAE 40, will that resulted viscosity be
closer to SAE 30 or SAE 60?
Better thermal stability, high VI, lower pour point, natural detergent (some cases), fire
resistant (some cases). - ANS-Name four possible benefits of using synthetic base oil
as a lubricant.
Polyalphaolefin (PAO) - ANS-Name the synthetic base oil that is widely used as
crankcase oil and is mixable with mineral oil.
Phosphate Estar, water glycol, oil-water emulsions. - ANS-Name three fluids that are
used as fire resistant hydraulic fluid.
,Esters such as phosphate Esther, polyol ester, and dibasic acid ester - ANS-What types
of synthetics are at risk for water-induced degradation called hydrolysis?
Incompatibility with base oils and/or additive. - ANS-What is a common cause of seal
swell or seal shrinkage?
American Petroleum Institute - ANS-What does API stand for?
American Society for Testing and Materials - ANS-What does ASTM stand for?
Both - ANS-Which of the following would be considered a white oil?
Group III hydrocracked mineral oil
Group IV PAO synthetic
PAO - ANS-Which of the following would have the highest VI?
PAO
Hydrocracked mineral oil
Solvent refined paraffinic
Phosphate Ester
False - ANS-A mineral-based oil that has a lot of aromatics and sulfur is less prone to
oxidation. True or false?
False - ANS-Mineral base oils that have very high VI are more prone to dissolve
additive. True or false?
Salt
Wax
Aromatics
Sulfur compounds
Nitrogen compounds
Solids
Water - ANS-Name four impurities of mineral oils that are removed in the refining
process.
10 to 30% - ANS-What concentration of additives might be found in typical diesel engine
crankcase oil?
Dispersants
Detergents
,AW additives
EP additive
Rust inhibitors - ANS-Name three types of polar additives.
Dirt and airborne dust
Engine wear debris
Rust
Fuel soot
Manufacturing or rebuild debris
Failed filter debris - ANS-What types of solid contaminants might you find in a used
diesel crank case oil?
Hindered phenols
Aromatic amines
ZDDP - ANS-Name three types of antioxidants.
High temperature, water oil aeration, Metal catalyst (for example, wear debris) -
ANS-Name common causes of lubricant oxidation.
Sludge/varnish formation, oil darkening, acids and putrid oil odor. - ANS-What are
common indications of oil oxidation that are observed with the human senses?
Causes corrosive wear, oil flow is hampered by varnish and sludge, filters plug, increase
viscosity causes heat buildup and oil flow problems. - ANS-How does oxidized oil affect
machine reliability?
Rotating pressure vessel oxidation test - others, FTIR, DSC, cyclic voltametry -
ANS-Which test can be used to assess the depletion of antioxidant additives?
To produce a barrier film on oil-wetted ferrous surfaces to repel water. - ANS-What is
the role of a rust inhibitor?
All lubricants, except some synthetics, are formulated with rust inhibitors - ANS-Name
four lubricant types that are typically formulated with rust inhibitors.
Motor oils, also some compressor oils, paper machine oils, and gas engine oils -
ANS-Name a common lubricant that uses a detergent additive
Neutralize acids and control deposits - ANS-What are the two functions of a crankcase
oil detergent additive?
, Dispersant - ANS-Name the additive that is polar, envelopes soot, and keeps it finally
divided.
Coolant contamination, Overextended oil drain, Water contamination High blowby, long
idling, high elevation, exhaust gas recirculation. - ANS-Name common causes of loss of
dispersancy in motor oil.
Engine deposits, sludge, impaired lubrication and oil flow. - ANS-What are
consequences of a loss of dispersancy?
Rust inhibitor - ANS-What is the name of the additive that is primarily designed to
control rust?
VI improver - ANS-What is a common additive found in SAE 0W-30 motor oil but not
found in SAE 30 motor oil?
Viscosity increase, AN increase, darker color, putrid oil odor, the oil will oxidize. - ANS-In
case of an oil that has operated for an extended period of time with depleted antioxidant
additives, how might the properties of that oil change?
Pour point dispersant - ANS-Name the additive that specifically reduces an oil's
tendency to fail to flow at cold start up temperatures.
Silicone - ANS-Name a common polymer used as an anti-foam agent.
Antiwear and anti-oxidation - ANS-What properties are provided by the additive ZDDP?
Zinc and phosphorus - ANS-Which two metals are often seen on oil analysis reports
that come from the additive ZDDP?
Sulfur phosphorus - ANS-Name a common EP additive that is soluble in oil.
molybdenum disulfide, graphite, PTFE, borate. - ANS-Name four solid lubricants found
in some gear oils and greases.
AW - ANS-Which of these two additives is commonly found in hydraulic fluids; AW or
EP?
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