MEDICAL GAS 6010 INSTALLERS NEWEST WITH COMPLETE ALL 300 QUESTIONS AND CORRECT
DETAILED ANSWERS| BRAND NEW VERSION!
Question 1
An existing system that is not in strict compliance with the provisions of this code shall be
permitted to be continued in use as long as the _ has determined that such use does not constitute
a distinct hazard to life.
A) Architect
B) Authority having jurisdiction
C) Design Engineer
D) Nursing staff
E) Medical Gas Verifier
Correct Answer: B) Authority having jurisdiction
Rationale: Per NFPA 99, the Authority Having Jurisdiction (AHJ) is the organization, office,
or individual responsible for enforcing the requirements of a code or standard, or for
approving equipment, materials, an installation, or a procedure. They have the final say on
the safety of existing systems.
Question 2
Cylinder and cryogenic liquid container outlet connections shall be designed as to render the
attachment point _ when removal of the outlet connection is attempted.
A) Reusable
B) Unusable
C) Unsuitable
D) Universal
E) Replaceable
Correct Answer: B) Unusable
Rationale: To prevent the cross-connection of medical gases, NFPA 99 requires that gas-
specific outlet connections be designed such that they cannot be removed and reused. If
removal is attempted, the connection must be rendered unusable to ensure system integrity.
Question 3
Cylinders in use and in storage shall be prevented from reaching temperatures in excess of _ *F.
A) 120
B) 125
C) 130
D) 135
E) 150
Correct Answer: B) 125
Rationale: High temperatures can cause the pressure within a gas cylinder to rise
dangerously, potentially triggering the pressure relief device. NFPA 99 specifies 125°F as
the maximum safe ambient temperature for storage and use.
, 2
Question 4
Nitrous oxide and carbon dioxide using cylinders or portable containers shall be prevented from
reaching temperatures lower than _ *F.
A) 130
B) 125
C) 20
D) -20
E) 0
Correct Answer: C) 20
Rationale: Nitrous oxide and carbon dioxide can experience significant pressure drops and
delivery issues due to the cooling effect of vaporization. Maintaining a temperature above
20°F prevents the regulators and valves from freezing or malfunctioning.
Question 5
Which of the following systems shall not be permitted to be located in an outdoor enclosure?
A) Bulk cryogenic liquid cylinders
B) Manifolds for gas cylinders
C) Manifolds for cryogenic liquid containers
D) Medical air sources
E) Emergency Oxygen Supply Connections (EOSC)
Correct Answer: D) Medical air sources
Rationale: Medical air compressors must be protected from environmental contaminants
and extreme weather to ensure the quality of the air being intake. Therefore, they are
required to be in an indoor, climate-controlled, and ventilated environment.
Question 6
Indoor locations for oxygen, nitrous oxide, and mixtures of these gases shall not communicate
with any of the following except _?
A) Area with open flames
B) Designated storage area
C) Engines
D) Kitchens
E) Boiler rooms
Correct Answer: B) Designated storage area
Rationale: Medical gas storage rooms must be dedicated to that purpose. They are
prohibited from opening into areas with high ignition risks (flames, engines, kitchens) but
can communicate with other designated medical gas storage or manifold rooms.
Question 7
Locations for central supply systems shall have _ devices protected from physical damage?
A) Electrical
, 3
B) Pressure indicating
C) Regulating
D) Relief
E) Monitoring
Correct Answer: A) Electrical
Rationale: Electrical equipment in gas storage or manifold rooms (such as switches, outlets,
and lights) must be protected to prevent physical damage that could cause sparking or
failure in an oxygen-rich or high-pressure environment.
Question 8
Outdoor locations surrounded by impermeable walls, except fire barrier walls, shall have
protected ventilation openings at the _ of each wall to allow free circulation of air within the
enclosure?
A) Base
B) Corner
C) Middle
D) Top
E) Center
Correct Answer: A) Base
Rationale: Because many medical gases (like Nitrous Oxide or CO2) are heavier than air,
they can pool at floor level. Openings at the base of the walls ensure that any leaked gases
can dissipate rather than concentrating in the enclosure.
Question 9
All positive pressure supply systems shall be provided with duplex line pressure regulators piped
in _?
A) Circuit
B) Loop
C) Parallel
D) Series
E) Tandem
Correct Answer: C) Parallel
Rationale: Regulators are piped in parallel to allow for maintenance or failure of one
regulator without interrupting the gas flow to the facility. This "duplex" setup ensures
continuous operation.
Question 10
All pressure relief valves shall be made of brass, bronze, or _?
A) Carbon steel
B) Cast iron
C) Copper
, 4
D) Stainless steel
E) Aluminum
Correct Answer: D) Stainless steel
Rationale: Materials used for medical gas relief valves must be corrosion-resistant and
compatible with high-oxygen environments. Brass, bronze, and stainless steel are the only
approved materials for these components.
Question 11
Central supply systems for positive pressure gases shall have one or more relief valves, the
valves shall have a relief setting that is _% above normal working operating pressure?
A) 30
B) 40
C) 50
D) 60
E) 100
Correct Answer: C) 50
Rationale: NFPA 99 requires relief valves to be set at 50% above the normal line pressure to
prevent over-pressurization of the piping system while avoiding "nuisance" trips from
minor pressure fluctuations.
Question 12
When vented to the outside, relief valve vent lines shall be labeled in which way?
A) Adhesive markers
B) Any manner that will distinguish them from the medical gas pipeline
C) Stenciling
D) Stickers
E) Color-coded tape only
Correct Answer: B) Any manner that will distinguish them from the medical gas pipeline
Rationale: It is critical that maintenance personnel do not confuse a vent line with a
pressurized supply line. The code allows flexibility in the method of labeling, provided it
clearly distinguishes the vent from the gas distribution piping.
Question 13
An auxiliary source connection shall consist of all of the following except?
A) Removable plug or cap
B) Tee
C) Valve
D) Visual pressure indicator
E) Necessary hardware for connection
Correct Answer: D) Visual pressure indicator
Rationale: An auxiliary source connection (like an EOSC) requires a tee, a valve, and a
DETAILED ANSWERS| BRAND NEW VERSION!
Question 1
An existing system that is not in strict compliance with the provisions of this code shall be
permitted to be continued in use as long as the _ has determined that such use does not constitute
a distinct hazard to life.
A) Architect
B) Authority having jurisdiction
C) Design Engineer
D) Nursing staff
E) Medical Gas Verifier
Correct Answer: B) Authority having jurisdiction
Rationale: Per NFPA 99, the Authority Having Jurisdiction (AHJ) is the organization, office,
or individual responsible for enforcing the requirements of a code or standard, or for
approving equipment, materials, an installation, or a procedure. They have the final say on
the safety of existing systems.
Question 2
Cylinder and cryogenic liquid container outlet connections shall be designed as to render the
attachment point _ when removal of the outlet connection is attempted.
A) Reusable
B) Unusable
C) Unsuitable
D) Universal
E) Replaceable
Correct Answer: B) Unusable
Rationale: To prevent the cross-connection of medical gases, NFPA 99 requires that gas-
specific outlet connections be designed such that they cannot be removed and reused. If
removal is attempted, the connection must be rendered unusable to ensure system integrity.
Question 3
Cylinders in use and in storage shall be prevented from reaching temperatures in excess of _ *F.
A) 120
B) 125
C) 130
D) 135
E) 150
Correct Answer: B) 125
Rationale: High temperatures can cause the pressure within a gas cylinder to rise
dangerously, potentially triggering the pressure relief device. NFPA 99 specifies 125°F as
the maximum safe ambient temperature for storage and use.
, 2
Question 4
Nitrous oxide and carbon dioxide using cylinders or portable containers shall be prevented from
reaching temperatures lower than _ *F.
A) 130
B) 125
C) 20
D) -20
E) 0
Correct Answer: C) 20
Rationale: Nitrous oxide and carbon dioxide can experience significant pressure drops and
delivery issues due to the cooling effect of vaporization. Maintaining a temperature above
20°F prevents the regulators and valves from freezing or malfunctioning.
Question 5
Which of the following systems shall not be permitted to be located in an outdoor enclosure?
A) Bulk cryogenic liquid cylinders
B) Manifolds for gas cylinders
C) Manifolds for cryogenic liquid containers
D) Medical air sources
E) Emergency Oxygen Supply Connections (EOSC)
Correct Answer: D) Medical air sources
Rationale: Medical air compressors must be protected from environmental contaminants
and extreme weather to ensure the quality of the air being intake. Therefore, they are
required to be in an indoor, climate-controlled, and ventilated environment.
Question 6
Indoor locations for oxygen, nitrous oxide, and mixtures of these gases shall not communicate
with any of the following except _?
A) Area with open flames
B) Designated storage area
C) Engines
D) Kitchens
E) Boiler rooms
Correct Answer: B) Designated storage area
Rationale: Medical gas storage rooms must be dedicated to that purpose. They are
prohibited from opening into areas with high ignition risks (flames, engines, kitchens) but
can communicate with other designated medical gas storage or manifold rooms.
Question 7
Locations for central supply systems shall have _ devices protected from physical damage?
A) Electrical
, 3
B) Pressure indicating
C) Regulating
D) Relief
E) Monitoring
Correct Answer: A) Electrical
Rationale: Electrical equipment in gas storage or manifold rooms (such as switches, outlets,
and lights) must be protected to prevent physical damage that could cause sparking or
failure in an oxygen-rich or high-pressure environment.
Question 8
Outdoor locations surrounded by impermeable walls, except fire barrier walls, shall have
protected ventilation openings at the _ of each wall to allow free circulation of air within the
enclosure?
A) Base
B) Corner
C) Middle
D) Top
E) Center
Correct Answer: A) Base
Rationale: Because many medical gases (like Nitrous Oxide or CO2) are heavier than air,
they can pool at floor level. Openings at the base of the walls ensure that any leaked gases
can dissipate rather than concentrating in the enclosure.
Question 9
All positive pressure supply systems shall be provided with duplex line pressure regulators piped
in _?
A) Circuit
B) Loop
C) Parallel
D) Series
E) Tandem
Correct Answer: C) Parallel
Rationale: Regulators are piped in parallel to allow for maintenance or failure of one
regulator without interrupting the gas flow to the facility. This "duplex" setup ensures
continuous operation.
Question 10
All pressure relief valves shall be made of brass, bronze, or _?
A) Carbon steel
B) Cast iron
C) Copper
, 4
D) Stainless steel
E) Aluminum
Correct Answer: D) Stainless steel
Rationale: Materials used for medical gas relief valves must be corrosion-resistant and
compatible with high-oxygen environments. Brass, bronze, and stainless steel are the only
approved materials for these components.
Question 11
Central supply systems for positive pressure gases shall have one or more relief valves, the
valves shall have a relief setting that is _% above normal working operating pressure?
A) 30
B) 40
C) 50
D) 60
E) 100
Correct Answer: C) 50
Rationale: NFPA 99 requires relief valves to be set at 50% above the normal line pressure to
prevent over-pressurization of the piping system while avoiding "nuisance" trips from
minor pressure fluctuations.
Question 12
When vented to the outside, relief valve vent lines shall be labeled in which way?
A) Adhesive markers
B) Any manner that will distinguish them from the medical gas pipeline
C) Stenciling
D) Stickers
E) Color-coded tape only
Correct Answer: B) Any manner that will distinguish them from the medical gas pipeline
Rationale: It is critical that maintenance personnel do not confuse a vent line with a
pressurized supply line. The code allows flexibility in the method of labeling, provided it
clearly distinguishes the vent from the gas distribution piping.
Question 13
An auxiliary source connection shall consist of all of the following except?
A) Removable plug or cap
B) Tee
C) Valve
D) Visual pressure indicator
E) Necessary hardware for connection
Correct Answer: D) Visual pressure indicator
Rationale: An auxiliary source connection (like an EOSC) requires a tee, a valve, and a
