MLT I & MLA I CERTIFICATION EXAM
QUESTIONS WITH VERIFIED SOLUTIONS
NEW MODIFIED GRADED A+
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 --CORRECT ANSWER--SAE 0W-30
When a SAE 20 is blended with an SAE 40, will that resulted
viscosity be closer to SAE 30 or SAE 60? --CORRECT ANSWER--
SAE 30
Name four possible benefits of using synthetic base oil as a lubricant.
--CORRECT ANSWER--Better thermal stability, high VI, lower pour
point, natural detergent (some cases), fire resistant (some cases).
Page 1 of 68
,Name the synthetic base oil that is widely used as crankcase oil and is
mixable with mineral oil. --CORRECT ANSWER--Polyalphaolefin
(PAO)
Name three fluids that are used as fire resistant hydraulic fluid. --
CORRECT ANSWER--Phosphate Estar, water glycol, oil-water
emulsions.
What types of synthetics are at risk for water-induced degradation
called hydrolysis? --CORRECT ANSWER--Esters such as phosphate
Esther, polyol ester, and dibasic acid ester
What is a common cause of seal swell or seal shrinkage? --
CORRECT ANSWER--Incompatibility with base oils and/or additive.
What does API stand for? --CORRECT ANSWER--American
Petroleum Institute
Name the two most common types of mineral-based oils. Which
would have the highest VI? Which would have the lowest pour point?
--CORRECT ANSWER--Paraffinic has the highest VI. Naphthenic
has the lowest pour point.
Page 2 of 68
,What unit of measure is used with flash point and pour point? --
CORRECT ANSWER--Temperature in degrees Celsius
Is the specific gravity of a mineral oil typically higher or lower than
synthetic lubricants? --CORRECT ANSWER--Lower
Which has a higher VI, a PAO or a solvent-refined (Group 1) mineral
or oil? --CORRECT ANSWER--PAO
When and oil oxidizes, how does its viscosity typically change? --
CORRECT ANSWER--It goes up
In the SAE crankcase viscosity classification 0W-30, what does the W
stand for? --CORRECT ANSWER--Winter
What does ASTM stand for? --CORRECT ANSWER--American
Society for Testing and Materials
Which of the following would be considered a white oil?
Page 3 of 68
, Group III hydrocracked mineral oil
Group IV PAO synthetic --CORRECT ANSWER--Both
Which of the following would have the highest VI?
PAO
Hydrocracked mineral oil
Solvent refined paraffinic
Phosphate Ester --CORRECT ANSWER--PAO
A mineral-based oil that has a lot of aromatics and sulfur is less prone
to oxidation. True or false? --CORRECT ANSWER--False
Mineral base oils that have very high VI are more prone to dissolve
additive. True or false? --CORRECT ANSWER--False
Name four impurities of mineral oils that are removed in the refining
process. --CORRECT ANSWER--Salt
Wax
Aromatics
Sulfur compounds
Page 4 of 68
QUESTIONS WITH VERIFIED SOLUTIONS
NEW MODIFIED GRADED A+
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 --CORRECT ANSWER--SAE 0W-30
When a SAE 20 is blended with an SAE 40, will that resulted
viscosity be closer to SAE 30 or SAE 60? --CORRECT ANSWER--
SAE 30
Name four possible benefits of using synthetic base oil as a lubricant.
--CORRECT ANSWER--Better thermal stability, high VI, lower pour
point, natural detergent (some cases), fire resistant (some cases).
Page 1 of 68
,Name the synthetic base oil that is widely used as crankcase oil and is
mixable with mineral oil. --CORRECT ANSWER--Polyalphaolefin
(PAO)
Name three fluids that are used as fire resistant hydraulic fluid. --
CORRECT ANSWER--Phosphate Estar, water glycol, oil-water
emulsions.
What types of synthetics are at risk for water-induced degradation
called hydrolysis? --CORRECT ANSWER--Esters such as phosphate
Esther, polyol ester, and dibasic acid ester
What is a common cause of seal swell or seal shrinkage? --
CORRECT ANSWER--Incompatibility with base oils and/or additive.
What does API stand for? --CORRECT ANSWER--American
Petroleum Institute
Name the two most common types of mineral-based oils. Which
would have the highest VI? Which would have the lowest pour point?
--CORRECT ANSWER--Paraffinic has the highest VI. Naphthenic
has the lowest pour point.
Page 2 of 68
,What unit of measure is used with flash point and pour point? --
CORRECT ANSWER--Temperature in degrees Celsius
Is the specific gravity of a mineral oil typically higher or lower than
synthetic lubricants? --CORRECT ANSWER--Lower
Which has a higher VI, a PAO or a solvent-refined (Group 1) mineral
or oil? --CORRECT ANSWER--PAO
When and oil oxidizes, how does its viscosity typically change? --
CORRECT ANSWER--It goes up
In the SAE crankcase viscosity classification 0W-30, what does the W
stand for? --CORRECT ANSWER--Winter
What does ASTM stand for? --CORRECT ANSWER--American
Society for Testing and Materials
Which of the following would be considered a white oil?
Page 3 of 68
, Group III hydrocracked mineral oil
Group IV PAO synthetic --CORRECT ANSWER--Both
Which of the following would have the highest VI?
PAO
Hydrocracked mineral oil
Solvent refined paraffinic
Phosphate Ester --CORRECT ANSWER--PAO
A mineral-based oil that has a lot of aromatics and sulfur is less prone
to oxidation. True or false? --CORRECT ANSWER--False
Mineral base oils that have very high VI are more prone to dissolve
additive. True or false? --CORRECT ANSWER--False
Name four impurities of mineral oils that are removed in the refining
process. --CORRECT ANSWER--Salt
Wax
Aromatics
Sulfur compounds
Page 4 of 68
