Oilers/Plant Tenders (HHC) Civil Service Practice Exam

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On a compound marine steam engine, the eccentrics are lubricated by which method?

Automatic lubrication system
Gravity feed systems
Individual cups on the eccentric rods
Oil mist lubrication

The correct answer is: Individual cups on the eccentric rods

The correct method for lubricating the eccentrics on a compound marine steam engine involves using individual cups on the eccentric rods. This approach allows for precise lubrication directly at the points where the moving parts need it most, ensuring that the eccentrics, which play a crucial role in converting rotary motion to linear motion, operate smoothly and efficiently. Individual lubrication cups can be easily filled with oil and allow for the controlled release of lubricant, which keeps the friction between moving parts to a minimum. This focused lubrication makes it less likely for the oil to go to waste and ensures that the lubricated parts maintain optimal performance. In contrast, while automatic lubrication systems and gravity feed systems can provide lubrication to various engine components, they may not deliver the targeted lubrication needed for eccentrics specifically. Oil mist lubrication, while useful in some applications, doesn't provide the same level of direct, adjustable, and immediate lubrication that individual cups do, particularly in the context of a compound marine steam engine where precision is essential.