Question 59General Subjects - QMED
70% to passOf the many impurities commonly found in marine lubricating oil, which of the following CANNOT be removed by a centrifugal purifier at normal operating speeds and temperatures?
ADiesel fuel oil
BMetal particles
CWater
DCarbon particles
AI Explanation
The correct answer is A) Diesel fuel oil. Centrifugal purifiers are designed to remove impurities such as water, metal particles, and carbon particles from marine lubricating oil. However, diesel fuel oil is not easily removed by a centrifugal purifier operating at normal speeds and temperatures. Diesel fuel oil has a similar density to the lubricating oil, making it difficult to separate the two liquids using centrifugal force alone. The other options, water, metal particles, and carbon particles, can be effectively removed by a properly functioning centrifugal purifier.
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