MEDICAL GAS NFPA 99 EXAM QUESTIONS
AND CORRECT ANSWERS LATEST UPDATE
2026/2027 GRADED A+.
NitrousAoxideAcylindersAshallAbeApreventedAfromAreachingAtemperatur
esAinAexcessAof.A-AcorrectAanswers125AdegreesAF
CarbonAdioxideAcylindersAshallAbeApreventedAfromAreachingAtemperta
uresAbelow.A-AcorrectAanswers20AdegreesAF
CentralAsupplyAsystemsAforApositiveApressureAgassesAshallAhaveAoneAorA
moreAreliefAvalvesAwithAtheAreliefAsettingAaboveAnromalAoperatingApre
ssure.A-AcorrectAanswers50%
ActivitiesA,AsystemsA,AorAequipmentAwhoseAfailureAisAlikelyAtoAcauseAma
jorAinjuryAorAdeathAofApatients,Astaff,AorAvisitors.A
correctAanswersCategoryA1
Activities,Asystems,AorAequipmentAwhoseAfailureAisAlikelyAtoAcauseAmin
orAinjuryAtoApatients,Asta ff,AorAvisitors.A-AcorrectAanswersCategoryA2
Activities,Asystems,AorAequipmentAwhoseAfailureAisAnotAlikelyAtoAcauseAi
njuryAtoApatients,Astaff,A orAvisitorsAbutAcanAcauseAdiscomfort.A-
AcorrectAanswersCategoryA3
,Activites,Asystems,AorAequipmentAwhoseAfailureAwouldAhaveAnoAimpac
tAonApatientAcare.AAcorrectAanswersCategoryA4
TheAnumberAofAcylindersAinAanAInstrumentAAirAStandbyAheaderAshallAb
eAadequateAforAthisAamo untAofAtime.A-AcorrectAanswers1Ahour
OrbitalAweldedAtestAcouponsAshallAbeAinspectedAatAtheAstartAofAworkAa
ndAatAaAminimumAofAho wAmanyAhoursAthereafter?A-
AcorrectAanswers4Ahours
CopperAJointsAthatAhaveAbeenAcleanedAorAbrazingAshallAbeAbrazedAwith
inAthisAtime.AAcorrectAanswers8Ahours
AlternativeAairAforAMedicalAAirAcompressorAintakesAmustAbeAatAhandA7A
daysAperAweekAandAho wAmanyAhoursAperAday.A-
AcorrectAanswers24Ahours
MoistureAconcentrationAofAoutletsAduringAtheAverifierAPipingAPurityATe
stAshallAnotAexceedAthisA ppm.A-AcorrectAanswers500Appm
TheAlocalAalarmAofAtheAMedialAAirAshallAactivateAwhenAtheAdewApointAi
sAoverAtheAtemperature. A-AcorrectAanswers35AdegressAF
, TheAMasterAAlarmAwillAactivateAwhenAtheAmedicalAgasAlineAnormalApre
ssureAincreasesAorAdecr easesAbyAthisApercentageAamount.A-
AcorrectAanswers20%
ThisAisAtheAapproximateApercentageAofAtheAearth'sAatmosphereAthatAisA
oxygen.A-
A correctAanswers21%
CompletedAManufacturedAAssesmbliesAbeingAtestedAatA20%AaboveAop
eratingApressureAshallAn otAexceedthisApercentageAforAleakage?A-
AcorrectAanswers0.5%
MaximumAoxygenApercentageAcontentAinAaAMedicalAAirAProportioningA
systemAshallAbeAnoAhigh erAthan?A-AcorrectAanswers23.5%
CombustibleAliquidsAinAmedicalAgasAsystemsAareAthoseAwhichAhaveAaAfl
ashApointAatAorAaboveAth is.A-AcorrectAanswers100AdegreesAF
TheAqualityAofAinstrumentAairAshallAbeAfilteredAtoAthisAmicronAlevel.A-
AcorrectAanswers0.01
TheAqualityAofAmedicalAairAsupplyAshallAnotAexceedAthisAppmAcontentAg
aseousAhydrocarbons.AAcorrectAanswers25
AND CORRECT ANSWERS LATEST UPDATE
2026/2027 GRADED A+.
NitrousAoxideAcylindersAshallAbeApreventedAfromAreachingAtemperatur
esAinAexcessAof.A-AcorrectAanswers125AdegreesAF
CarbonAdioxideAcylindersAshallAbeApreventedAfromAreachingAtemperta
uresAbelow.A-AcorrectAanswers20AdegreesAF
CentralAsupplyAsystemsAforApositiveApressureAgassesAshallAhaveAoneAorA
moreAreliefAvalvesAwithAtheAreliefAsettingAaboveAnromalAoperatingApre
ssure.A-AcorrectAanswers50%
ActivitiesA,AsystemsA,AorAequipmentAwhoseAfailureAisAlikelyAtoAcauseAma
jorAinjuryAorAdeathAofApatients,Astaff,AorAvisitors.A
correctAanswersCategoryA1
Activities,Asystems,AorAequipmentAwhoseAfailureAisAlikelyAtoAcauseAmin
orAinjuryAtoApatients,Asta ff,AorAvisitors.A-AcorrectAanswersCategoryA2
Activities,Asystems,AorAequipmentAwhoseAfailureAisAnotAlikelyAtoAcauseAi
njuryAtoApatients,Astaff,A orAvisitorsAbutAcanAcauseAdiscomfort.A-
AcorrectAanswersCategoryA3
,Activites,Asystems,AorAequipmentAwhoseAfailureAwouldAhaveAnoAimpac
tAonApatientAcare.AAcorrectAanswersCategoryA4
TheAnumberAofAcylindersAinAanAInstrumentAAirAStandbyAheaderAshallAb
eAadequateAforAthisAamo untAofAtime.A-AcorrectAanswers1Ahour
OrbitalAweldedAtestAcouponsAshallAbeAinspectedAatAtheAstartAofAworkAa
ndAatAaAminimumAofAho wAmanyAhoursAthereafter?A-
AcorrectAanswers4Ahours
CopperAJointsAthatAhaveAbeenAcleanedAorAbrazingAshallAbeAbrazedAwith
inAthisAtime.AAcorrectAanswers8Ahours
AlternativeAairAforAMedicalAAirAcompressorAintakesAmustAbeAatAhandA7A
daysAperAweekAandAho wAmanyAhoursAperAday.A-
AcorrectAanswers24Ahours
MoistureAconcentrationAofAoutletsAduringAtheAverifierAPipingAPurityATe
stAshallAnotAexceedAthisA ppm.A-AcorrectAanswers500Appm
TheAlocalAalarmAofAtheAMedialAAirAshallAactivateAwhenAtheAdewApointAi
sAoverAtheAtemperature. A-AcorrectAanswers35AdegressAF
, TheAMasterAAlarmAwillAactivateAwhenAtheAmedicalAgasAlineAnormalApre
ssureAincreasesAorAdecr easesAbyAthisApercentageAamount.A-
AcorrectAanswers20%
ThisAisAtheAapproximateApercentageAofAtheAearth'sAatmosphereAthatAisA
oxygen.A-
A correctAanswers21%
CompletedAManufacturedAAssesmbliesAbeingAtestedAatA20%AaboveAop
eratingApressureAshallAn otAexceedthisApercentageAforAleakage?A-
AcorrectAanswers0.5%
MaximumAoxygenApercentageAcontentAinAaAMedicalAAirAProportioningA
systemAshallAbeAnoAhigh erAthan?A-AcorrectAanswers23.5%
CombustibleAliquidsAinAmedicalAgasAsystemsAareAthoseAwhichAhaveAaAfl
ashApointAatAorAaboveAth is.A-AcorrectAanswers100AdegreesAF
TheAqualityAofAinstrumentAairAshallAbeAfilteredAtoAthisAmicronAlevel.A-
AcorrectAanswers0.01
TheAqualityAofAmedicalAairAsupplyAshallAnotAexceedAthisAppmAcontentAg
aseousAhydrocarbons.AAcorrectAanswers25