RMGA Equipment Operation 4 — Questions and Answers
Question 1: A medical air compressor system must include which of the following to ensure air quality meets medical grade standards?
- A HEPA particulate filter only
- Dryers, filters, and carbon monoxide monitors (Correct answer)
- A pressure relief valve and flow meter only
- A liquid oxygen backup supply
Correct answer: Dryers, filters, and carbon monoxide monitors
Medical air systems require dryers to remove moisture, multiple filters for particulates and hydrocarbons, and CO monitors to detect contamination.
Question 2: What is the correct procedure when a medical gas outlet at the point of care does not deliver gas when connected?
- Replace the outlet immediately
- Check zone valve status, then pipeline pressure, then inspect the outlet for damage (Correct answer)
- Increase regulator pressure to compensate
- Switch to a different gas type temporarily
Correct answer: Check zone valve status, then pipeline pressure, then inspect the outlet for damage
Systematic troubleshooting starts with verifying zone valves are open and pipeline pressure is normal before inspecting the outlet itself.
Question 3: In a medical vacuum system, the term 'ultimate vacuum' refers to:
- The maximum flow rate the system can achieve
- The lowest absolute pressure the pump can attain under no-flow conditions (Correct answer)
- The vacuum level required for surgical suctioning
- The pressure at which the system alarm activates
Correct answer: The lowest absolute pressure the pump can attain under no-flow conditions
Ultimate vacuum is the theoretical lowest pressure a vacuum pump can reach when no gas is flowing into the inlet.
Question 4: Which condition makes it unsafe to store a medical gas cylinder in a horizontal position?
- Horizontal storage increases cylinder weight on the valve
- The valve can be damaged if the cylinder rolls, and liquid phase may enter the valve on some cylinders (Correct answer)
- Horizontal cylinders cannot be read accurately on content gauges
- Gravity causes the regulator to malfunction when horizontal
Correct answer: The valve can be damaged if the cylinder rolls, and liquid phase may enter the valve on some cylinders
Horizontal storage risks valve damage if the cylinder moves, and for cylinders with liquid content, the dip tube may deliver liquid rather than gas.
Question 5: A bulk liquid oxygen system's vaporizer converts LOX to gaseous oxygen by:
- Compressing the liquid to force phase change
- Using ambient air or electric heat to warm and vaporize the liquid (Correct answer)
- Mixing the LOX with nitrogen to promote vaporization
- Reducing system pressure to below atmospheric to boil the liquid
Correct answer: Using ambient air or electric heat to warm and vaporize the liquid
Ambient vaporizers use the heat energy from surrounding air to warm liquid oxygen, converting it to gas for pipeline distribution.
Question 6: What does the term 'manifold switchover' describe in a medical gas cylinder manifold system?
- The process of testing manifold pressure after installation
- The automatic or manual transfer from a depleted cylinder bank to a full reserve bank (Correct answer)
- Switching the manifold from high-pressure to low-pressure mode
- The procedure for connecting a new manifold to the pipeline
Correct answer: The automatic or manual transfer from a depleted cylinder bank to a full reserve bank
Manifold systems have primary and secondary banks; switchover occurs automatically when the primary bank is exhausted to maintain uninterrupted supply.
Question 7: According to NFPA 99, after repair or modification of a medical gas pipeline, which test must be performed before returning the system to service?
- Visual inspection only
- Cross-connection test, purity test, and pressure test (Correct answer)
- Flow rate test at maximum demand only
- Leak test at operating pressure only
Correct answer: Cross-connection test, purity test, and pressure test
NFPA 99 requires cross-connection testing, gas identity/purity verification, and pressure testing after any pipeline repair before clinical use.
RMGA Equipment Operation 4
A medical air compressor system must include which of the following to ensure air quality meets medical grade standards?