Which action is NOT part of activating or using the solid-state oxygen unit?

• A. Pushing the green button and lowering the green lever
• B. Disconnecting the unit from the power source
• C. Pinching the bag to check flow
• D. Placing the mask over the nose and mouth

Answer: (B)

Activating or using a solid-state oxygen unit involves turning it on, starting the flow, confirming that oxygen is actually being delivered, and then providing it to the wearer. Pushing the green button and lowering the green lever start or unfreeze the flow, making oxygen available. Pinching the bag to check flow is a quick way to verify that the unit is delivering oxygen into the reservoir. Placing the mask over the nose and mouth is how the user actually receives the oxygen. Disconnecting the unit from the power source is not part of activating or using it; cutting power would stop operation and is a shutdown or maintenance action, not a normal use step.