Med Gas Study Guide Exam 249
Questions And All Actual Answers
2026 | Verified & Update
When is the initial pressure test conducted, by a medical gas installer, on a nitrous
oxide system? - CORRECT ANSWER-After blowdown of a distribution piping
In those portions of systems intended to handle oxygen at pressures greater than
350 psi the interconnecting hose shall NOT contain ________ materials? -
CORRECT ANSWER-Polymeric
In a Category 1 Dental and Gas Vacuum Piping system, which of the following is
an NFPA 99 requirement for the labeling of pipes? - CORRECT ANSWER-Color
coding & non-standard pressure
Which of the following treatments shall be performed before brazing cut ends of a
tube to be installed in a medical gas piping system? - CORRECT ANSWER-Cut
ends shall be rolled smooth or deburred
Manifolds for gas cylinders shall actuate a(an) _______ signal and shall activate an
indicator at all _______ alarm panels to indicate when or just before changeover
from one header to the other. - CORRECT ANSWER-Local, master
,In a non-anesthetizing area, on which side of a zone valve shall the
pressure/vacuum sensor be located? - CORRECT ANSWER-Station outlet/inlet
What is the purpose of using an oxygen analyzer during the piping purge prior to
brazing? - CORRECT ANSWER-Assure that all ambient air has been removed
from the pipeline
A medical gas master or area alarm panel shall be set to actuate a(an) _____
indicator when the communication with an alarm-initiating device is disconnected.
- CORRECT ANSWER-Audible and visual
When an EOSC becomes the temporary supply source, a facility will monitor the
system by use of which of the following? - CORRECT ANSWER-Providing four
connection points to both master alarms
Which of the following conditions must be met where medical gas and vacuum
systems are installed by non-certified personnel? - CORRECT ANSWER-
installation by anyone other than 6010 certified personnel is NOT permitted
Which of the following systems shall NOT be permitted to be located in an
outdoor enclosure? - CORRECT ANSWER-Medical air compressor supply
sources
Metallic flexible joints are being used in the pipeline for vibration control. Which
of the following is NOT required of such joints? - CORRECT ANSWER-suitable
for service at 150 psig or above
© 2026 Copyright. All Rights Reserved. This document is
protected by copyright law
,who shall witness the installer-performed standing vacuum test? - CORRECT
ANSWER-the authority having jurisdiction, or its designee
the medical air compressor intake shall be located a minimum of how many feet
from any exhaust or plumbing vents? - CORRECT ANSWER-25 feet
the gas produced by evaporation from the secondary header in a cryogenic liquid
cylinder system shall enter the supply system ________ of the final line regulator. -
CORRECT ANSWER-upstream
with the approval of the Authority Having Jurisdiction, in which areas shall the
zone valves be permitted to be secured to prevent inappropriate access? -
CORRECT ANSWER-pediatric
factory installed inlet tubes on station outlets shall be NOT less than
__________with 0.3 inch minimum inside diameter. - CORRECT ANSWER-NPS
1/4, 3/8 in. O.D.
which of these operations would not breach the vacuum system? - CORRECT
ANSWER-testing a system component with a leak detector solution
except for valves in zone valve boxes, all valves shall be located in secured areas
such as locked pipe chases, or be __________. - CORRECT ANSWER-latched or
locked in operation position
medical gas Central Supply systems are NOT permitted to be located where? -
CORRECT ANSWER-in an unlocked location
, fittings, valves, and other components for field-installed positive pressure
distribution systems shall be ________ until prepared for installation. -
CORRECT ANSWER-delivered sealed, labeled, and kept sealed
vacuum piping for __________ shall be connected separately from the medical
surgical system directly to the receiver tank through its own isolation valve and
fluid trap located at the receiver. - CORRECT ANSWER-a teaching laboratory
NFPA 99 specifies that the medical gas piping system shall be protected against all
EXCEPT which of the following? - CORRECT ANSWER-exposure to liquids
category 1 support gasses carry which of these additional hazards? - CORRECT
ANSWER-higher pressures
manufactured assemblies for medical gas systems employing flexible hose shall use
flexible connectors with a minimum burst gauge pressure of how many psi? -
CORRECT ANSWER-1000
an assembly of equipment that holds a capacity of oxygen greater than
____________ is defined as a Bulk Oxygen System - CORRECT ANSWER-
20,000 ft^3
what does it mean when equipment, material or services are shows as "listed"? -
CORRECT ANSWER-they are identified and published by an organization that is
acceptable to the authority having jurisdiction
© 2026 Copyright. All Rights Reserved. This document is
protected by copyright law
Questions And All Actual Answers
2026 | Verified & Update
When is the initial pressure test conducted, by a medical gas installer, on a nitrous
oxide system? - CORRECT ANSWER-After blowdown of a distribution piping
In those portions of systems intended to handle oxygen at pressures greater than
350 psi the interconnecting hose shall NOT contain ________ materials? -
CORRECT ANSWER-Polymeric
In a Category 1 Dental and Gas Vacuum Piping system, which of the following is
an NFPA 99 requirement for the labeling of pipes? - CORRECT ANSWER-Color
coding & non-standard pressure
Which of the following treatments shall be performed before brazing cut ends of a
tube to be installed in a medical gas piping system? - CORRECT ANSWER-Cut
ends shall be rolled smooth or deburred
Manifolds for gas cylinders shall actuate a(an) _______ signal and shall activate an
indicator at all _______ alarm panels to indicate when or just before changeover
from one header to the other. - CORRECT ANSWER-Local, master
,In a non-anesthetizing area, on which side of a zone valve shall the
pressure/vacuum sensor be located? - CORRECT ANSWER-Station outlet/inlet
What is the purpose of using an oxygen analyzer during the piping purge prior to
brazing? - CORRECT ANSWER-Assure that all ambient air has been removed
from the pipeline
A medical gas master or area alarm panel shall be set to actuate a(an) _____
indicator when the communication with an alarm-initiating device is disconnected.
- CORRECT ANSWER-Audible and visual
When an EOSC becomes the temporary supply source, a facility will monitor the
system by use of which of the following? - CORRECT ANSWER-Providing four
connection points to both master alarms
Which of the following conditions must be met where medical gas and vacuum
systems are installed by non-certified personnel? - CORRECT ANSWER-
installation by anyone other than 6010 certified personnel is NOT permitted
Which of the following systems shall NOT be permitted to be located in an
outdoor enclosure? - CORRECT ANSWER-Medical air compressor supply
sources
Metallic flexible joints are being used in the pipeline for vibration control. Which
of the following is NOT required of such joints? - CORRECT ANSWER-suitable
for service at 150 psig or above
© 2026 Copyright. All Rights Reserved. This document is
protected by copyright law
,who shall witness the installer-performed standing vacuum test? - CORRECT
ANSWER-the authority having jurisdiction, or its designee
the medical air compressor intake shall be located a minimum of how many feet
from any exhaust or plumbing vents? - CORRECT ANSWER-25 feet
the gas produced by evaporation from the secondary header in a cryogenic liquid
cylinder system shall enter the supply system ________ of the final line regulator. -
CORRECT ANSWER-upstream
with the approval of the Authority Having Jurisdiction, in which areas shall the
zone valves be permitted to be secured to prevent inappropriate access? -
CORRECT ANSWER-pediatric
factory installed inlet tubes on station outlets shall be NOT less than
__________with 0.3 inch minimum inside diameter. - CORRECT ANSWER-NPS
1/4, 3/8 in. O.D.
which of these operations would not breach the vacuum system? - CORRECT
ANSWER-testing a system component with a leak detector solution
except for valves in zone valve boxes, all valves shall be located in secured areas
such as locked pipe chases, or be __________. - CORRECT ANSWER-latched or
locked in operation position
medical gas Central Supply systems are NOT permitted to be located where? -
CORRECT ANSWER-in an unlocked location
, fittings, valves, and other components for field-installed positive pressure
distribution systems shall be ________ until prepared for installation. -
CORRECT ANSWER-delivered sealed, labeled, and kept sealed
vacuum piping for __________ shall be connected separately from the medical
surgical system directly to the receiver tank through its own isolation valve and
fluid trap located at the receiver. - CORRECT ANSWER-a teaching laboratory
NFPA 99 specifies that the medical gas piping system shall be protected against all
EXCEPT which of the following? - CORRECT ANSWER-exposure to liquids
category 1 support gasses carry which of these additional hazards? - CORRECT
ANSWER-higher pressures
manufactured assemblies for medical gas systems employing flexible hose shall use
flexible connectors with a minimum burst gauge pressure of how many psi? -
CORRECT ANSWER-1000
an assembly of equipment that holds a capacity of oxygen greater than
____________ is defined as a Bulk Oxygen System - CORRECT ANSWER-
20,000 ft^3
what does it mean when equipment, material or services are shows as "listed"? -
CORRECT ANSWER-they are identified and published by an organization that is
acceptable to the authority having jurisdiction
© 2026 Copyright. All Rights Reserved. This document is
protected by copyright law
