Oilers/Plant Tenders (HHC) Civil Service Practice Exam

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True or False: An oil that can mix with water is usually used for hydraulic cylinders of turbine governors.

True
False
Only in emergency situations
Depends on the design

The correct answer is: False

The statement is considered false because oils that are used in hydraulic systems, such as those for hydraulic cylinders of turbine governors, are generally hydrophobic. This means they do not mix well with water. In fact, the presence of water in hydraulic oil is typically undesirable because it can lead to a host of problems such as corrosion, decreased lubrication effectiveness, and potential failure of hydraulic components. Hydraulic oils are specifically formulated to provide the necessary viscosity and lubrication under varying pressure and temperature conditions, while also possessing chemical stability and resistance to water. If an oil could mix with water, its effectiveness in a hydraulic application would be compromised, which is why non-emulsifying oils are preferred. Some emergency or specialized situations may call for specific formulations that can handle water, but these are exceptions rather than the norm for hydraulic systems. Therefore, the answer is considered false, as the standard practice in these applications is to avoid water-miscible oils.