MDE 11 Q7

Correct Answer: C) Regularly cleaning and maintaining the separator

Explanation: Regular maintenance ensures that the separator operates efficiently, reducing the risk of incomplete separation and oil losses.

• Correct Answer: C) Oil is spun at high speed to separate contaminants based on density

Explanation: The centrifugal filter operates by spinning the oil at high speed within the rotor. This high-speed rotation creates a centrifugal force that causes the denser particles (contaminants) to move outward, separating them from the less dense, cleaner oil. This process is entirely mechanical and relies on the principle of density differences.

• Correct Answer: C) To remove contaminants from the oil by using centrifugal force

Explanation: The primary function of a centrifugal type lubricating oil filter is to remove contaminants such as dirt, metal particles, and other impurities from the lubricating oil. It does this by spinning the oil at high speeds in a rotating bowl or rotor, which generates centrifugal force. This force pushes the denser contaminants to the outer wall of the rotor, separating them from the cleaner oil.

Correct Answer: B) To assess the oil’s ability to neutralize acids
Explanation: The TBN measures the oil's ability to neutralize acidic byproducts from combustion, which is critical to preventing corrosion and maintaining engine health.

Correct Answer: C) To detect the presence of contaminants such as soot and water
Explanation: The blotter spot test helps identify contaminants like soot, water, and fuel dilution by analyzing the dispersion of oil on filter paper.

Correct Answer:
B) The filter uses a series of closely spaced metal plates to trap and remove solid particles from the oil as it passes through.

Explanation: A plate edge (e.g., Auto-Klean) lubricating oil filter works by passing the oil through a series of closely spaced metal plates. As the oil flows between the edges of these plates, solid particles are trapped and removed from the oil, effectively filtering it. This type of filter is often self-cleaning, as the plates can be scraped clean without needing to stop the system.

Correct Answer: B) Periodically cleaning the oil using a centrifugal separator
Explanation: Regular cleaning of the lubricating oil using a centrifugal separator removes contaminants and helps maintain the oil in optimum condition. While changing the oil is important, it’s not as frequent and essential as cleaning.

Correct Answer: D) It can reduce oil flow through the engine

Explanation: Water contamination can cause the oil to become emulsified, reducing its ability to flow properly through the engine.