MDE 10 Q4

Correct Answer: A) The oil remains fluid and pumpable at low temperatures

Explanation: The pour point of an oil indicates the lowest temperature at which it remains fluid and can be pumped. A low pour point ensures that the oil can operate effectively even in cold conditions.

Correct Answer: A) To prevent premature ignition and reduce fire risk

Explanation: A high flash point indicates that the oil can withstand higher temperatures before igniting, which is crucial in diesel engines where high temperatures are common. This helps in reducing the risk of fire and ensuring safety.

Correct Answer: A) To prevent oil degradation and maintain performance over time

Explanation: High oxidation resistance helps prevent the oil from breaking down due to reactions with oxygen. This maintains the oil’s performance and prolongs its useful life, ensuring reliable engine protection.

These questions and answers cover essential properties of lubricating oil, highlighting their importance for engine performance and safety.

Correct Answer: B) Total Base Number (TBN)

Explanation: The Total Base Number (TBN) measures the oil’s ability to neutralize acidic byproducts from combustion. A higher TBN indicates better capacity to protect engine parts from acid corrosion.

Correct Answer: A) Viscosity

Explanation: Viscosity is essential for preventing metal-to-metal contact because it determines the oil’s ability to maintain a lubricating film between moving parts. A proper viscosity ensures that the oil can form a thick enough film to prevent wear.