Oilers/Plant Tenders (HHC) Civil Service Practice Exam

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What type of lubricating systems typically feed lubricants by gravity?

Pressure-fed systems
Drip-feed, wick feed, and wiper-type systems
Manual grease guns
Centrifugal lubrication systems

The correct answer is: Drip-feed, wick feed, and wiper-type systems

Drip-feed, wick feed, and wiper-type systems typically utilize gravity to transport lubricants to the necessary components. In these systems, lubricants are delivered through a controlled drop or via capillary action from a reservoir, allowing them to flow slowly to the points that require lubrication. This method relies on gravity's natural force to ensure that the lubricant reaches the target area steadily, which can be especially important in applications needing a consistent supply without the application of excess pressure. Pressure-fed systems, while effective for many machinery applications, involve pumps that supply lubricant under pressure and do not rely on gravity. Manual grease guns also do not use gravity as they are operated by applying manual pressure to dispense the lubricant. Centrifugal lubrication systems use the centrifugal force to help distribute lubricants but again do not depend on gravity for the lubricant's movement. Thus, the unique feature of drip-feed, wick feed, and wiper-type systems allowing for gravity-driven lubricant feed sets them apart, making them the correct choice for this question.