MLT 1 Exam Top Rated Questions and Answers Graded A 2024

Name the two most common types of mineral base oils. - Paraffinic. Naphathenic
What unit of measure is used with flash point and pour point? - Temperature
Is the specific gravity of a mineral oil typically higher or lower than synthetic lubricants? -
Lower
Which has a higher VI, a PAO or a solvent-refined (Group I) mineral oil? - PAO
When an oil oxidizes, how does it's viscosity typically change? - It goes up.
In the SAE crankcase viscosity classification 0W-30, what does the W stand for? -
Winter
Of the following motor oils, which oil is best suited for cold start conditions?
• SAE 15W-50
• SAE 40
• SAE 20
• SAE 0W -30 - SAE 0W-30
When a SAE 20 is blended with a SAE 40, will the resulted viscosity be closer to SAE
30 or SAE 60? - SAE 30
Name four possible benefits of using synthetic base oil as a lubricant. - Better thermal
stability, high VI, lower pour point, natural detergency (some cases), fire resistance
(some cases).
Name the synthetic base oil that is widely used as crankcase oil and is mixable with
mineral oil. - Polyalphaolefin (PAO)
Name 3 fluids that are used as fire resistant hydraulic fluids. - Phosphate ester, water
glycol, oil-water emulsions
What types of synthetics are at risk for water-induced degradation called hydrolysis? -
Esters such as phosphate ester, polyol ester, dibasic acid eater
What is a common cause of seal swell or seal shrinkage? - Incompat