Oilers/Plant Tenders (HHC) Civil Service Practice Exam

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What type of pump does NOT have moving parts that require lubrication?

Centrifugal Pump
Jet Pump
Positive Displacement Pump
Gear Pump

The correct answer is: Jet Pump

The jet pump, known for its operation through the principles of fluid dynamics, consists of a nozzle that creates a high-velocity jet of fluid, which in turn lifts or transports the fluid without any moving mechanical parts that require lubrication. This type of pump relies on the kinetic energy of the fluid to move the liquid, utilizing high-pressure jet streams to induce flow. As a result, maintenance related to lubricating moving parts is not necessary, making it distinct in its operational design compared to other types of pumps mentioned. In contrast, centrifugal pumps, positive displacement pumps, and gear pumps typically feature moving parts, such as rotors or impellers, that require lubrication to reduce friction and wear during operation. These moving components are critical for their functionality, leading to increased maintenance requirements associated with moving parts.