MDE 11 End of Unit Quiz

Correct Answer: A) Different types of contaminants require a different discharge frequency

Explanation: Different contaminants may have different effects on the purifier's efficiency and capacity, influencing how often discharges are needed. For example, heavier solids might require more frequent discharges than lighter contaminants.

Correct Answer: B) To match the oil viscosity with the separator’s operational requirements

Explanation: Using the correct type of oil with appropriate viscosity ensures that the separator operates efficiently and minimizes oil losses.

• Correct Answer: B) A rotating bowl or rotor

Explanation: The rotating bowl or rotor is the key component that creates the centrifugal force needed to separate contaminants from the oil. As the rotor spins at high speed, the centrifugal force causes the heavier contaminants to move outward and accumulate on the inner wall of the bowl, while the cleaner oil remains closer to the center and is then recirculated.

Correct Answer: C) Onboard testing for water content and acid number
Explanation: Onboard testing for parameters such as water content, acid number, and viscosity provides essential information about the oil's condition and suitability for continued use.

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: B) By regularly testing the oil's viscosity, water content, and acid number
Explanation: Regular testing of the oil's physical and chemical properties is essential to monitor its condition and determine if it remains effective.

• 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: A) By preventing oil leakage through seal and joint failures

Explanation: Proper sealing and joint integrity prevent oil from leaking out of the separator, thus minimizing oil losses.

Correct Answer: B) To separate water from fuel by causing small water droplets to combine into larger droplets.

Explanation:
The primary function of a coalescer type filter is to separate water from fuel. It works by causing small water droplets dispersed in the fuel to coalesce (combine) into larger droplets, which can then be easily separated from the fuel. This is essential in preventing water contamination in the fuel, which can cause corrosion and other operational issues in a diesel engine.

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) Ensuring proper engine warm-up before operation

Explanation: Properly warming up the engine ensures that it reaches operating temperature, reducing the risk of condensation and water contamination in the oil.