84 Medical Gas Exam Questions – NFPA 99 Practice
Test with Verified Correct Rationales A+ Graded
Latest Updated 2026
Station outlets/inlets shall be identified as to the _______ for the specific gas or vacuum
provided.
a. Chemical symbol
b. Name
c. Name or chemical symbol
d. Piping type
c
When brazing, joints shall be continuously purged with oil-free, dry nitrogen NF to prevent the
formation of _______ on the inside surface of the joint.
a. Copper oxide
b. Crystalliation
c. Polymeric materials
d. Volatalized liquids
a
ASSE 6000 Annex J provides "Recommended Guidelines for Conducting Planned Medical gas
Systems Shutdown and Temporary Backfeed." Annex J guidelines do NOT include a list of
responsibilites for which types of worker?
a. Installer
b. Medical Gas Generalist
c. Shutdown Coordinator
d. Verifier
b
What is the standard gauge pressure (psi) for nitrogen gas service?
a. 15-30
b. 50-55
c. 160-185
d. It varies with the system type
c
,In a facility where medical gas or vacuum systems are present and the failure of such equipment
or system is likely to cause imminent major injury or death to patients or caregivers, the system
shall be designed to meet which Category of requirements?
a. 1
b. 2
c. 3
d. 4
a
How many hours must the medical air compressor system be operating normally before air
quality test can be performed?
a. 2
b. 8
c. 12
d. 32
c
Which of the following fittings is NOT permitted for joining vacuum distribution pipeline
systems?
a. Axially swaged
b. Memory metal
c. Non-removable push-fit
d. Welded
c
Medical air sources shall be used for ______ and human respiration.
a. Air-operating devices
b. Calibration of medical respiratory devices
c. Disinfecting tools.
d. Instrument air
b
In central supply systems using gas cylinders, each header shall have a __________ valve to
prevent backflow and to permit service to the header.
a. Ball
b. Bypass
c. Check
d. Relief
, c
Which type of connectors shall connect the medical air compressors with their intake and outlet
piping?
a. Compression fitting
b. Dielectric
c. Flexible
d. Insulated
c
WAGD networks shall provide a WAGD inlet in all locations where _____ is intended to be
administered.
a. Medical air
b. Nitrogen
c. Nitrous oxide
d. Oxygen
c
In a bulk supply system, when the cryogenic liquid reserve's contents are reduced to one day's
supply, which alarm system(s) shall be activated?
a. Area
b. Local
c. Master
d. Master and area
c
Which is a permitted use of the medical-surgical vacuum system?
a. Liquid or debris disposal
b. Non-medical or non-surgical applications
c. Vacuum steam condensate return
d. Waste anesthetic gas disposal
d
A ______ system is an assembly of equipment such as storage containers, pressure regulators,
pressure relief devices, vaporizers, manifolds, and interconnecting piping that has a storage
capacity of more than 20,000 cubic feet (at normal temperature and pressure), including
unconnected reserves on hand at the site.
a. Bulk oxygen
b. High pressure maniifold
Test with Verified Correct Rationales A+ Graded
Latest Updated 2026
Station outlets/inlets shall be identified as to the _______ for the specific gas or vacuum
provided.
a. Chemical symbol
b. Name
c. Name or chemical symbol
d. Piping type
c
When brazing, joints shall be continuously purged with oil-free, dry nitrogen NF to prevent the
formation of _______ on the inside surface of the joint.
a. Copper oxide
b. Crystalliation
c. Polymeric materials
d. Volatalized liquids
a
ASSE 6000 Annex J provides "Recommended Guidelines for Conducting Planned Medical gas
Systems Shutdown and Temporary Backfeed." Annex J guidelines do NOT include a list of
responsibilites for which types of worker?
a. Installer
b. Medical Gas Generalist
c. Shutdown Coordinator
d. Verifier
b
What is the standard gauge pressure (psi) for nitrogen gas service?
a. 15-30
b. 50-55
c. 160-185
d. It varies with the system type
c
,In a facility where medical gas or vacuum systems are present and the failure of such equipment
or system is likely to cause imminent major injury or death to patients or caregivers, the system
shall be designed to meet which Category of requirements?
a. 1
b. 2
c. 3
d. 4
a
How many hours must the medical air compressor system be operating normally before air
quality test can be performed?
a. 2
b. 8
c. 12
d. 32
c
Which of the following fittings is NOT permitted for joining vacuum distribution pipeline
systems?
a. Axially swaged
b. Memory metal
c. Non-removable push-fit
d. Welded
c
Medical air sources shall be used for ______ and human respiration.
a. Air-operating devices
b. Calibration of medical respiratory devices
c. Disinfecting tools.
d. Instrument air
b
In central supply systems using gas cylinders, each header shall have a __________ valve to
prevent backflow and to permit service to the header.
a. Ball
b. Bypass
c. Check
d. Relief
, c
Which type of connectors shall connect the medical air compressors with their intake and outlet
piping?
a. Compression fitting
b. Dielectric
c. Flexible
d. Insulated
c
WAGD networks shall provide a WAGD inlet in all locations where _____ is intended to be
administered.
a. Medical air
b. Nitrogen
c. Nitrous oxide
d. Oxygen
c
In a bulk supply system, when the cryogenic liquid reserve's contents are reduced to one day's
supply, which alarm system(s) shall be activated?
a. Area
b. Local
c. Master
d. Master and area
c
Which is a permitted use of the medical-surgical vacuum system?
a. Liquid or debris disposal
b. Non-medical or non-surgical applications
c. Vacuum steam condensate return
d. Waste anesthetic gas disposal
d
A ______ system is an assembly of equipment such as storage containers, pressure regulators,
pressure relief devices, vaporizers, manifolds, and interconnecting piping that has a storage
capacity of more than 20,000 cubic feet (at normal temperature and pressure), including
unconnected reserves on hand at the site.
a. Bulk oxygen
b. High pressure maniifold
