Which components in a gaseous oxygen system are vented to blow out plugs in the fuselage?

The correct answer is that pressure relief valves in a gaseous oxygen system are vented to blow out plugs in the fuselage. This function is crucial for maintaining safety and pressurization integrity within the oxygen system.

Pressure relief valves are designed to release excess pressure that could build up within the oxygen system, preventing potential over-pressurization and ensuring that the system remains within safe operating limits. If the internal pressure exceeds a predetermined threshold, the pressure relief valves will activate, venting the excess gas through the blowout plugs located in the fuselage. This design not only protects the integrity of the system but also provides a safe mechanism to prevent potential hazards associated with over-pressurized oxygen.

The other components listed, such as pressure gauges, flow meters, and oxygen masks, serve different roles within the system. Pressure gauges measure the pressure of the oxygen but do not relieve it, flow meters indicate the flow rate of oxygen being delivered, and oxygen masks are used by passengers or crew during emergencies. None of these components have the venting mechanism associated with blowout plugs, making pressure relief valves the appropriate choice.