Oilers/Plant Tenders (HHC) Civil Service Practice Exam

What is the proper rate of oil feed to a steam cylinder with a 10-inch diameter piston?

1. One quart per day

2. One pint per day

3. Two quarts per day

4. Half a pint per day

The correct answer is: One pint per day

The correct answer relates to the lubrication needs of a steam cylinder with a specific piston diameter. A steam cylinder, particularly one with a 10-inch diameter piston, requires a consistent oil feed to ensure smooth operation and prevent wear. The general standard for oil feed is based on the piston size and the operating conditions of the steam engine. In this case, one pint per day is considered an appropriate amount of oil. This quantity strikes a balance between adequate lubrication—enough to coat the moving parts and reduce friction without overwhelming the system. Over-lubrication can lead to oil misting and reduced performance, while under-lubrication can cause excessive wear and potential failure. A quarter or two quarts would be excessive for a cylinder of this size, potentially causing oil to contaminate steam and diminishing engine efficiency. Half a pint would likely be insufficient, as it may not provide adequate coverage for the moving parts and could lead to premature wear. Thus, one pint per day establishes a sufficient lubrication standard for the given cylinder size and ensures proper operation and longevity of the machinery.