Oilers/Plant Tenders (HHC) Civil Service Practice Exam

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What is the maximum lubricant oil temperature allowed for the bearings of steam turbines?

  1. 100 to 110 degrees F

  2. 110 to 120 degrees F

  3. 120 to 130 degrees F

  4. 130 to 140 degrees F

The correct answer is: 110 to 120 degrees F

The maximum lubricant oil temperature allowed for the bearings of steam turbines is critical for ensuring the safe and efficient operation of the machinery. Maintaining appropriate lubricant temperatures is essential for preventing overheating, which can lead to oil breakdown, reduced lubrication effectiveness, and ultimately, bearing failure. Option B specifies a temperature range of 110 to 120 degrees F, which is aligned with the typical operational limits for steam turbine bearings. This range indicates that the lubricant can function effectively within these temperatures without increasing the risk of thermal degradation. It is crucial for effective heat transfer and minimizing wear on the bearings while ensuring adequate viscosity for proper lubrication. Being within this specific range allows for safe operational margins, enhancing the longevity of the bearings and overall turbine performance. Going even slightly above this range can negatively affect the lubricant properties, potentially leading to increased friction and overheating of the bearings, jeopardizing the entire system's reliability.