MDE 11 Q7

Correct Answer: B) The level of contaminants in the oil

Explanation: The discharge frequency of the oil purifier is largely determined by the amount of contaminants in the oil. Higher contamination levels lead to more frequent discharges to maintain oil purity.

Correct Answer: C) By using a series of filter media that cause small water droplets to merge into larger droplets, which are then easily separated.

Explanation:
Coalescer filters use specialized filter media designed to coalesce, or combine, small water droplets in the fuel into larger droplets. Once the water droplets are large enough, they can be separated from the fuel more easily, typically settling out and being removed via a water separator.

Correct Answer: C) A leaking cylinder head gasket

Explanation: A leaking cylinder head gasket can allow coolant or water to mix with the engine oil, leading to contamination.

Correct Answer: C) Incomplete separation of contaminants

Explanation: Incomplete separation can lead to oil carryover, where the oil mixed with contaminants exits the separator, causing oil losses.

Correct Answer: A) A larger capacity purifier will have a lower discharge frequency

Explanation: A purifier with a larger capacity can handle more oil before needing to discharge contaminants, thus reducing the frequency of discharges.

Correct Answer: B) By allowing oil to escape through leaks

Explanation: Seal and joint failures can lead to oil leakage, which results in oil loss from the separator.

• 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) 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.