Oilers/Plant Tenders (HHC) Civil Service Practice Exam

What is the most economical method to introduce lubricating oil into a horizontal superheated steam reciprocating engine?

1. Pour oil directly into the cylinder

2. Use a pump to circulate oil

3. Atomize the oil into the steam at the steam inlet

4. Lubricate manually at intervals

The correct answer is: Atomize the oil into the steam at the steam inlet

Atomizing the oil into the steam at the steam inlet is considered the most economical method for introducing lubricating oil into a horizontal superheated steam reciprocating engine because it allows for a more efficient and uniform distribution of the lubricant across critical engine components. This method utilizes the energy and flow of the steam to disperse tiny droplets of oil, enhancing the lubrication process without requiring significant mechanical components or additional energy expenditure. By atomizing the oil, it ensures that the lubricant is adequately mixed with the steam, promoting better coverage on moving parts, which reduces wear and tear and increases the overall efficiency of the engine. This method can also minimize wastage and improve the lubrication effectiveness at higher temperatures, which is essential for superheated steam operations. Other methods, such as using a pump to circulate oil or manually lubricating at intervals, do not achieve the same level of distribution or efficiency and might require more time and energy. Pouring oil directly into the cylinder can lead to inefficient lubrication and potential operational issues, such as foaming or improper oil distribution, which can negatively impact engine performance.