The portion of the medical gas supply equipment that automatically supplies the system when the primary and secondary are unable to do so is called what?

• A. Secondary source
• B. Reserve supply
• C. Back-up source
• D. Emergency supply

Answer: (B)

Automatic continuity of gas flow is tested here. In a hospital medical gas system, gas comes from a primary source and a secondary source to cover routine failures. If both are unable to deliver, a reserve supply automatically takes over to keep the system pressurized and delivering gas. This reserve is connected in a way that senses pressure drop and opens to feed the line, ensuring no interruption in patient care. The term reserve supply is the standard name for this automatic, last-resort source.