MDE 10 Q3

Explanation:

• A) Reduces friction between engine components: Correct. One of the primary functions of lubricating oil is to reduce friction between moving parts, which minimizes wear and improves engine efficiency.
• B) Enhances fuel combustion efficiency: Incorrect. While lubricating oil affects overall engine performance, it does not directly enhance fuel combustion efficiency.
• C) Cools engine components by carrying away heat: Correct. Lubricating oil helps to dissipate heat generated by engine components, contributing to engine cooling.
• D) Cleans engine parts by suspending contaminants: Correct. Lubricating oil helps to remove and suspend contaminants such as dirt and metal particles, keeping the engine clean.
• E) Seals gaps between moving parts: Incorrect. Lubricating oil does not seal gaps; it primarily reduces friction and helps in cooling and cleaning.
• F) Protects engine parts from corrosion and rust: Correct. Lubricating oil contains additives that protect engine parts from corrosion and rust.

A) Increases oil viscosity and reduces lubrication efficiency: Incorrect. Fuel dilution generally reduces oil viscosity and lubrication efficiency.

B) Reduces the oil’s ability to carry away heat: Incorrect. Fuel dilution affects lubrication and may not significantly impact heat dissipation.

C) Leads to increased oil consumption and potential for engine damage: Correct. Fuel dilution lowers the oil’s lubricating properties and can lead to increased oil consumption and engine wear.

D) Improves the oil’s cleaning ability: Incorrect. Fuel dilution actually reduces the oil's cleaning ability.

A) Increases oil viscosity and leads to foaming: Incorrect. Water typically reduces oil viscosity and can cause foaming.

B) Promotes corrosion and rust formation on engine components: Correct. Water contamination leads to rust and corrosion.

C) Enhances the oil’s cleaning and dispersant properties: Incorrect. Water does not enhance cleaning properties; it can harm them.

D) Improves the oil’s cooling capacity: Incorrect. Water does not improve oil cooling; it can cause damage.

A) Fuel dilution: Incorrect. Silicon is not typically associated with fuel dilution.

B) Increased wear from abrasive particles: Correct. High silicon levels indicate the presence of abrasive particles, leading to wear.

C) Increased oil oxidation: Incorrect. Silicon is not directly related to oil oxidation.

D) Higher levels of water contamination: Incorrect. Silicon contamination is not related to water levels.

A) Improves oil cleanliness by removing contaminants: Incorrect. Soot contributes to contamination rather than improving cleanliness.

B) Increases the risk of abrasive wear and reduces oil life: Correct. Soot can cause abrasive wear and degrade oil quality.

C) Enhances lubrication properties and reduces friction: Incorrect. Soot generally harms lubrication properties and increases friction.

D) Improves the oil's ability to protect against corrosion: Incorrect. Soot does not improve corrosion protection.

Explanations:

1. A) Water: Correct. Water contamination can lead to rust and corrosion, affecting engine performance and durability.B) Sulfates: Incorrect. Sulfates are not typically identified from oil samples in standard analysis but are rather a byproduct of combustion.

   C) Silicon: Correct. Silicon usually indicates the presence of dust or dirt, which can cause abrasive wear.

   D) TBN: Incorrect. TBN is a measure of the oil's ability to neutralize acids, not a contaminant.