The lube oil quality management system used...

Question 1 / 2066636eef28f7522a1c51fdcb

Question 1 of 2066636eef28f7522a1c51fdcb

The lube oil quality management system used on your general-purpose supply vessel requires on board testing of lubricating oil to include testing for viscosity at the same temperature consistently. In terms of viscosity test results, what statement is true?

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🔍 Key Concepts

• Viscosity behavior when oil is thinned by fuel contamination vs. thickened by oxidation and aging • The meaning of an unusual rise vs. an unusual drop in viscosity on a trend line of lube oil samples • Typical causes of fuel dilution and oxidation in engine lube oil systems

💭 Think About

• If diesel fuel gets into lubricating oil, does it make the oil thicker or thinner? How would that change viscosity? • When lubricating oil is severely oxidized (overheated / aged), does it usually build sludge and become thicker, or get thinner? • Look at each answer choice and check whether its description of what causes a rise vs. a drop in viscosity makes physical sense.

✅ Before You Answer

• Be clear on which condition (oxidation vs. fuel dilution) would normally increase viscosity and which would normally decrease it. • Check that each option treats rise and drop in viscosity consistently (no internal contradictions). • Eliminate any choice that suggests the same cause (oxidation or dilution) can reasonably produce both an unusual rise and an unusual drop in viscosity.

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Question 1 of 20

An unusual rise in viscosity indicates excessive oxidation of the lubricating oil OR excessive dilution of the lubricating oil with diesel fuel oil OR BOTH.

An unusual drop in viscosity indicates excessive oxidation of the lubricating oil and an unusual rise in viscosity indicates excessive dilution of the lubricating oil with diesel fuel oil.

An unusual drop in viscosity indicates excessive dilution of the lubricating oil with diesel fuel oil and an unusual rise in viscosity indicates excessive oxidation of the lubricating oil.

Question 1 / 2066636eef28f7522a1c51fdcb

Question 1 of 2066636eef28f7522a1c51fdcb

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Question 1 of 20

66636eef28f7522a1c51fdcb

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🔍 Key Concepts

💭 Think About

✅ Before You Answer

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