Oilers/Plant Tenders (HHC) Civil Service Practice Exam

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What is the sealing fluid in lubricating oil centrifuges?

Oil
Water
Air
Liquid Nitrogen

The correct answer is: Water

In lubricating oil centrifuges, the sealing fluid is typically water. This is because water serves as an effective medium to prevent contaminants and unwanted substances from entering the oil, thus maintaining the purity and effectiveness of the lubrication system. The use of water also helps to manage the temperature of the centrifuge, ensuring that the equipment operates within safe limits, reducing the risk of overheating and potential damage. While oil may seem like a plausible choice because it is involved in the lubrication process, it does not serve the role of sealing fluid effectively as it could lead to contamination of the lubrication system itself. Air and liquid nitrogen are not viable options for sealing fluids in this context, as they do not provide the necessary physical properties to create an effective seal or to manage thermal conditions adequately.