FAA AMT Airframe Test 2025 – 400 Free Practice Questions to Pass the Exam

A A pressure regulator controls the pressure of the oxygen, not the amount being delivered.

C: An electronic servo valve is used in controlled breathing systems, not continuous flow systems.

D: A manual control valve is controlled by the user and does not regulate the amount of oxygen being delivered.

The most accurate explanation is that a calibrated orifice is what controls the flow rate of oxygen in a continuous flow oxygen system. A calibrated orifice is a fixed size opening that restricts the flow of oxygen, thereby controlling the amount of oxygen being delivered to the mask. This is done by adjusting the size of the opening to match the desired flow rate, typically measured in liters per minute. Other options such as a pressure regulator, electronic servo valve, and manual control valve are incorrect because they do not have the same function or control in a continuous flow oxygen system.