Oilers/Plant Tenders (HHC) Civil Service Practice Exam 2026 - Free Oilers & Plant Tenders Practice Questions and Study Guide

The preferred choice for the hydraulic governor of a reciprocating steam engine is non-additive turbine type oil. This type of oil is specifically designed for high-speed machinery and provides excellent lubrication without the risk of forming varnish or sludge, which can impair the governor's performance. The composition of non-additive turbine type oil allows it to maintain consistent viscosity and stability under varying temperature and pressure conditions, which is essential for the accurate and responsive operation of hydraulic governors.

In contrast, while other types of oil such as mineral oil, synthetic oil, and biodegradable oil have their own advantages in different applications, they may not provide the same level of stability or performance that is optimal for hydraulic systems in steam engines. Mineral oils can often contain additives that might not be suitable for the delicate mechanisms of a governor, and synthetic oils, while offering excellent performance under extreme conditions, may not be necessary for the specific requirements of a hydraulic governor. Biodegradable oils, while environmentally friendly, may not yet provide the durability and efficiency required for long-term application in hydraulic systems.

Thus, the non-additive turbine type oil is tailored for such operational needs, making it the most fitting choice for use in a hydraulic governor of a reciprocating steam engine.