Oilers/Plant Tenders (HHC) Civil Service Practice Exam

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When large gears are bath lubricated, the oil level should be maintained so that ________

The highest gear teeth are submerged
The lowest gear teeth dip into the oil
The oil is at a constant level
The gears are kept dry

The correct answer is: The lowest gear teeth dip into the oil

Maintaining the oil level so that the lowest gear teeth dip into the oil is essential for optimal lubrication and performance of large gears that are bath lubricated. When the lowest gear teeth are submerged, they ensure that there is a continuous supply of oil to the gear surfaces as they rotate. This action helps reduce friction and wear, thereby prolonging the lifespan of the gears and preventing overheating. With the oil around the lower gears, it allows for effective oil circulation as the gears move, which is crucial for dissipating heat and keeping the operating temperature within safe limits. If the oil level were too low, it would not adequately lubricate all the moving parts, increasing the risk of mechanical failure. Conversely, if the oil level were too high and submerged the highest gear teeth, it could lead to foaming, increased drag, and other lubrication issues that would compromise the functionality of the gears. Thus, correct oil level maintenance is vital for efficient operation in gear systems.