When the engine is idling, what is the state of the hydraulic system?

When the engine is idling, the hydraulic system operates at low power and low speed. This is because the hydraulic pump, which generates pressure needed for the system to function effectively, is driven by the engine. At idle speed, the engine is not producing the increased RPMs required to operate the hydraulic pump at its full capacity. As a result, the hydraulic fluid moves more slowly through the system, thus reducing the power available for tasks such as lifting or moving heavy loads.

In contrast, when the engine runs at higher speeds, the hydraulic system can generate higher pressure and speed, enabling it to perform more demanding functions. The other options either suggest a state that implies active or enhanced performance, which is not possible when the engine is simply idling.