Which hydraulic systems have electric pumps?

The choice that indicates the hydraulic systems with electric pumps accurately reflects the design of the Airbus A320. In the A320, the blue hydraulic system is primarily powered by an electric pump, especially when the engines are not running or when there is a need for additional hydraulic pressure without relying solely on engine-driven pumps. The yellow hydraulic system also contains an emergency electric pump that can be activated if the engine-driven pump is inoperative, ensuring continued functionality for critical systems like landing gear and brakes.

The green hydraulic system, on the other hand, derives its pressure primarily from engine-driven pumps and does not include an electric pump. Therefore, the correct choice highlights the blue and yellow systems, which effectively utilize electric pumps for their operation, enhancing redundancy and safety in hydraulic system functionality.