Oilers/Plant Tenders (HHC) Civil Service Practice Exam

Where is the oil line typically located for lubricating the steam cylinder of a double-acting steam uniflow engine?

1. In the crank case

2. At the throttle valve

3. At the exhaust port

4. On the steam inlet

The correct answer is: At the throttle valve

The oil line for lubricating the steam cylinder of a double-acting steam uniflow engine is typically positioned at the throttle valve. This location is crucial because the throttle valve is directly involved in regulating the steam flow to the engine. By placing the oil line at this juncture, it ensures that the lubricating oil is injected into the steam stream just before it enters the steam cylinder. This method of lubrication is effective because it allows the oil to be carried into the cylinder with the steam, thereby achieving optimal lubrication as the steam expands and exerts pressure on the cylinder. Proper lubrication is essential for minimizing friction, reducing wear, and maintaining efficient engine performance. The other options, such as the crank case or the exhaust port, are not suitable locations for the oil line in this context. The crank case primarily deals with lubricating the engine's internal components and would not provide direct lubrication to the steam cylinder. Similarly, positioning the oil line at the exhaust port would be counterproductive, as it would not effectively deliver oil into the steam cylinder where it is needed most. Lastly, while the steam inlet could theoretically allow for lubrication, the throttle valve offers the most effective and practical means of ensuring that lubrication occurs simultaneously with the introduction of steam into