BOILER OPERATOR QUESTIONS AND VERIFIED ANSWERS 2025/2026

BOILER OPERATOR'S EXAM PREP NCH - BOILER
OPERATOR'S EXAM PREPARATION GUIDE 2025/2026
WITH ACCURATE QUESTIONS AND ANSWERS

AtC0CPSIG,ChowCmanyCBTUCareCnecessaryCtoCchangeC1ClbCofCwaterCatC212CDegreesCFCintoC1ClbCofCste
am?C-CCORRECTCANSWER-970CBTU

RadiationCis?C-CCORRECTCANSWER-
aCformCofCheatCtransferCthatCisCradiatedCorCtransmittedCinCtheCformCofCwaves.

SteamCatC100CPSICandC400CDegreesCFCis?C-CCORRECTCANSWER-superheated

WhichCofCtheCfollowingCmostCcloselyCdefinesCsensibleCheat?

a)CAnCestablishedCrelationshipCcomparingCanyCsubstanceCtoCtheCheatCcontentCofCwater
C



b)CHeatCquantityCthatCcanCbeCfeltCorCmeasuredCbyCaCthermometer
C



c)CHeatCquantityCaboveCtheCpointCofCsaturation
C



d)CMeasureCofCheatCintensityC-CCORRECTCANSWER-
C


b)CHeatCquantityCthatCcanCbeCfeltCorCmeasuredCbyCaCthermometer

WhatCisCrequiredCtoCraiseCtheCtemperatureCofC1ClbCofCwaterCfromC32CDegreesCFCtoC212CDegreesCF?C-
CCORRECTCANSWER-180CBTU



IncreasingCtheCpressureChasCwhatCeffectConCtheCboilingCpointCofCwater?C-CCORRECTCANSWER-
TemperatureCwillCbeCraised

HeatCabsorbedCbyCwaterCwhenCitCchangesCfromCliquidCtoCsteamCatCtheCboilingCpointCisCcalled?C-
CCORRECTCANSWER-latentCheat



HeatCmayCbeCtransferredCinChowCmanyCways?C-CCORRECTCANSWER-ThreeCwaysC-
Cradiation,Cconduction,Cconvection



ACboilerChorsepowerCisCdefinedCas?C-CCORRECTCANSWER-
theCevaporationCofC34.5ClbCofCwaterCfromCandCatC212CdegreesCFCperChour.

ACboiler'sCsteamCpressureCgaugeCreadsC150.CWhatCisCtheCabsoluteCpressure?C-CCORRECTCANSWER-
164.7CPSIAC150+14.7=164.7

WhatCdoesC212CdegreesCFCequalConCtheCCelsiusCscale?C-CCORRECTCANSWER-100CdegreesCC.

, OneCboilerChorsepowerCisCequalCtoChowCmanyCBTUs?C-CCORRECTCANSWER-33,472CBTU

ACBritishCthermalCunitCis?C-CCORRECTCANSWER-
TheCamountCofCheatCneededCtoCraiseConeCpoundCofCwaterConeCdegreeCFahrenheit

HydronicCheatCis?C-CCORRECTCANSWER-hotCwaterCheat

SuperheatedCsteamCisC-CCORRECTCANSWER-reheatedCsteam

2545CBTUHCrepresentsC-CCORRECTCANSWER-1Chorsepower-hour

ACthrottlingCcalorimeterCisCusedCtoCmeasureCtheCqualityCofC-CCORRECTCANSWER-saturatedCsteam

TheCamountCofCheatCinConeCpoundCofCsaturatedCsteamCisCapproximatelyCequalCto?C-
CCORRECTCANSWER-1150CBTU



ACboilerCoperatingCatC100CPSIChasCaCdryCsaturatedCsteamCtemperatureCofC338CdegreesCF.CWhatCisCth
eCboiler'sCwaterCtemperature?C-CCORRECTCANSWER-338CdegreesCF

ACdryCpipeCisCusedCto?C-CCORRECTCANSWER-SeparateCmoistureCfromCsteamCasCitCleavesCtheCdrum

TheCpurposeCofCtheCstayboltCisCto?C-CCORRECTCANSWER-
strengthenCandCsupportCflatCplatesCofCaCfire-tubeCboiler

TheCboilerCventCvalveCisClocatedConCthe?C-CCORRECTCANSWER-toCofCtheCsteamCdrum

TheCpurposeCofCtheCholeCinCtheCendCofCtheCstayboltCisCto?C-CCORRECTCANSWER-
indicateCthatCaCstayboltCisCcrackedCorCbroken

ACfusibleCplugCmeltsCat?C-CCORRECTCANSWER-450CdegreesCF

AsCtheCfiringCrateCincreasedCinCaCboilerCequippedCwithCaCconvectionCsuperheater,CtheCsteamCtemp
erature?C-CCORRECTCANSWER-increases

whenCboilersCareCconnectedCtoCaCcommonCheader,CitCisCrequiredCthatCanCampleCfreeCblowingCdrain
CbeCprovidedCbetweenCtheCstopCvalvesCifCeitherCorCbothCboilersChaveC-CCORRECTCANSWER-


manholes

ItCisCpermissibleCtoChaveConlyConeCbottomCblowdownCvalveConCaCboilerCwhenCtheC-
CCORRECTCANSWER-MAWPCdoesCnotCexceedC100CPSI



WhenCtheCboilerCpressureCexceedsC_____CpsiCitCisCrequiredCthatCextraCheavyCpipeCbeCusedConCtheCb
lowoffCsystemC-CCORRECTCANSWER-125CPSI

bafflesCareCplacedCbetweenCtheCtubesCofCtheCboilerCforCtheCpurposeCofC-CCORRECTCANSWER-
directingCtheCtravelCofCflueCgases