Oilers/Plant Tenders (HHC) Civil Service Practice Exam

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When is it inappropriate to use water as a lubricant?

In high-temperature conditions
Only if oil is available
In all situations
When dealing with electrical components

The correct answer is: In high-temperature conditions

Using water as a lubricant can lead to various complications, particularly when dealing with high-temperature conditions. Water has a relatively low boiling point (100 degrees Celsius or 212 degrees Fahrenheit), and in high-temperature applications, it can evaporate quickly, losing its lubricating effectiveness. This evaporation can also lead to a decrease in the cooling effect, resulting in potential overheating of machinery or components. Additionally, in high temperatures, water can increase the risk of corrosion in metal components, which can lead to failure or reduced lifespan of the machinery. Hence, it's crucial to consider the operating conditions before using water as a lubricant. While there might be specific scenarios where water could act as a temporary lubricant, such as when oil is not available, relying on water exclusively in high-temperature applications can pose significant risks. This highlights the importance of selecting appropriate lubricants based on the specific conditions of the application.