On a hydraulic schematic, the default state for components should be shown as ______ unless specified otherwise.

• A. Energized
• B. De-energized
• C. Operating
• D. Idle

Answer: (B)

The main idea is to show what a component sits in when nothing is actively driving it. In hydraulic schematics, the resting or default position is depicted as de-energized because many devices return to a neutral state when power is removed or control is inactive. This provides a clear baseline for understanding how the circuit behaves during startup, power loss, or maintenance, and it helps with troubleshooting since you know what the valve or actuator will be doing in its normal rest condition.

If a diagram needs to show a different baseline, it will indicate that the component is energized or in another specific state. Using “de-energized” as the default avoids ambiguity and aligns with how many hydraulic controls are designed to return to a safe, non-operated position when not energized.