Which term describes a container that keeps a supply of working fluid in a hydraulic system?

• A. Hydraulic reservoir
• B. Heat exchange
• C. Hydraulic line
• D. Hydraulic valve

Answer: (A)

In a hydraulic system, you need a place to store the fluid so the pump has a ready supply and to accommodate changes in volume from temperature or operation. This container is the hydraulic reservoir. It acts as a tank that holds working fluid, provides space for expansion, helps air separate from the liquid so the pump draws mostly liquid, and keeps the system primed. A reservoir often includes a vent and sometimes filters or coolers, but its main role is storage and ensuring a stable supply for the system.

The other terms describe different parts: a hydraulic line is the tube or pipe that carries fluid between components; a hydraulic valve controls the flow, direction, and pressure; a heat exchange removes excess heat from the fluid.