MDE 11 Q1

Correct Answer:
D) The filter causes small droplets of water or other liquids to merge into larger droplets, which are then separated from the oil.

Explanation: A coalescer lubricating oil filter works by using materials that cause small droplets of water or other liquids to coalesce, or merge, into larger droplets. These larger droplets are easier to separate from the oil, allowing them to be removed efficiently, thus purifying the oil from water or other liquid contaminants.

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) The filter employs a magnetic field to attract and remove ferrous particles from the oil.

Explanation: A magnetic lubricating oil filter operates by using a magnetic field to attract and capture ferrous (iron-based) particles that may be present in the oil, thereby preventing these particles from circulating through the engine and causing wear or damage.

Correct Answer:
C) The filter uses centrifugal force to separate contaminants from the oil.

Explanation: A centrifugal lubricating oil filter operates by spinning the oil at high speeds, which generates centrifugal force. This force pushes heavier contaminants, such as dirt, metal particles, and sludge, to the outer edges of the filter, effectively separating them from the cleaner oil. The clean oil can then be recirculated back into the engine, while the contaminants remain trapped in the filter.