HVAC LEVEL 1 EXAM QUESTIONS WITH CORECT ANSWERS 2025

HVAC LEVEL 1 EXAM QUESTIONS WITH
CORECT ANSWERS 2025
WhatYareYtheY3YgasYlaws?Y-YCORRECTYANSWERY-BoylesYlaw,YCharlesYlaw,YgeneralYgasYlaw



WhatYisYoneYwattYequalYtoYinYbtu'sY-YCORRECTYANSWERY-3.412



WhatYisY1YhorsepowerYequalYtoYinYwatts?Y-YCORRECTYANSWERY-746Ywatts



whatYisY1YhorsepowerYofYworkY-YCORRECTYANSWERY-33,000Yft/lbs/min



WhatYisYnetYrefrigerationYeffectYformula,YNRE?Y-YCORRECTYANSWERY-evap.YoutY-Yevap.Yin



WhatYisYCOPYusedYfor?Y-YCORRECTYANSWERY-ratingYaYsystemYforYheating



whatYisYtheYseerYusedYforY-YCORRECTYANSWERY-ratingYaYsystemYforYcooling



whatYfactorsYareYusedYinYBoylesYlawY-YCORRECTYANSWERY-pressure,Yvolume



whatYfactorsYareYusedYinYCharlesYlawY-YCORRECTYANSWERY-volumeYandYtempurature



whatYfactorsYareYusedYinYtheYgeneralYgasYlawY-YCORRECTYANSWERY-pressure,YvolumeYandYtempurature



whatYisYinductiveYreactanceY-YCORRECTYANSWERY-OppositionYtoYcurrentYflowYinYaYcircuitYdueYtoYinduction.



whatYisYcapacitiveYreactanceY-YCORRECTYANSWERY-
TheYoppositionYofYACYcurrentYflowYcausedYbyYaYcapacitor.



WhatYisYimpedance?Y-YCORRECTYANSWERY-
ItYisYtheYcombinedYeffectYofYresistance,YinductiveYreactance,YandYcapacitiveYreactanceYinYanYACYcircuit.

,whatYisYheatYofYcompressionY-YCORRECTYANSWERY-
theYamountYofYheatYaddedYtoYrefrigerantYduringYcompression



whatYisYtheYheatYofYrejectionY-YCORRECTYANSWERY-
theYamountYofYheatYremovedYfromYtheYsystemYwhenYitYentersYtheYcondenser



WhatYisYsubcooling?Y-YCORRECTYANSWERY-
LoweringYliquidYrefrigerantYtemperatureYbelowYitsYsaturationYtemperature



WhatYisYflashYgas?Y-YCORRECTYANSWERY-
RoughlyY25%YofYtheYliquidYleavingYtheYmeteringYdeviceYthatYimmediatelyYvaporizes.



whatYisYtheYequationYforYcompressionYratioY-YCORRECTYANSWERY-
absoluteYhighYsideYpressureY/YabsoluteYlowYsideYpressure



whatYcanYcauseYaYhighYcompressionYratioYonYtheYhighYsideY-YCORRECTYANSWERY-
dirty/YblockedYcoil,YrecirculatingYair,YdefectiveYfan,YdefectiveYwiring,YdefectiveYmotorYcomponents



whatYcanYcauseYaYhighYcompressionYratioYonYtheYlowYsideY-YCORRECTYANSWERY-
dirty/YblockedYevaporator,YdirtyYairYfilterY,YdefectiveYevap.Yfan,YdirtyYblower,YbeltYissues(ifYbeltYdriven)



whatYisYanotherYnameYforYtheYblowerYwheelY-YCORRECTYANSWERY-squirlYcage



whatYpercentageYofYcallsYareYelectricalYorYmaintenanceYissuesY-YCORRECTYANSWERY-90%



whatYdoesYSEERYstandY-YCORRECTYANSWERY-seasonalYenergyYefficiencyYratio



whatYdoesYCOPYstandYforY-YCORRECTYANSWERY-CoefficientYofYperformance



WhatYisYdensity?Y-YCORRECTYANSWERY-MassYperYunitYvolume

,WhatYisYspecificYheat?Y-YCORRECTYANSWERY-
TheYamountYofYenergyYneededYtoYraiseYtheYtemperatureYofY1YgramYofYaYsubstanceYbyY1YdegreeYCelsius.



whatYisYspecificYgravityY-YCORRECTYANSWERY-
theYratioYofYtheYdensityYofYaYsubstanceYtoYtheYdensityYofYwater



whatYisYspecificYvolumeY-YCORRECTYANSWERY-volumeYperYunitYmass(YreciprocalYofYdensity)



whatYisYenergyYpurchasedYinY-YCORRECTYANSWERY-kilowatts



whatYisYtheYequationYforYworkY-YCORRECTYANSWERY-workY=YforceYxYdistance



whatYisYtheYconversionYfromYwattYtoYkilowattY-YCORRECTYANSWERY-1YkW=Y1000YW



whatYisYabsoluteYpressureY-YCORRECTYANSWERY-14.696



WhatYisYtypeYL-YcopperYtubingYusedYfor?Y-YCORRECTYANSWERY-branchYwaterYsupply



whatYisYtypeYkYcopperYusedYforY-YCORRECTYANSWERY-waterYlines,Yoil



WhatYisYPVCYusedYfor?Y-YCORRECTYANSWERY-PVC:YWellies,Yraincoats,Y

uPVC:YDrainpipes,Ywindow/doorYframes

ElectricalYwireYinsulation



whatYisYbrazingYtemperaturesY-YCORRECTYANSWERY-1205f-Y1550f



whatYisYsolderingYtemp.Y-YCORRECTYANSWERY-361f-Y500f

, whatYisYsilverYsolderYtemp.Y-YCORRECTYANSWERY-800fYtoY1200f



whatYisYsilverYsolderYusedYforY-YCORRECTYANSWERY-copperYtoYcopperYandYcopperYtoYbrassYconnections



whatYareYtheY3YforcesYofYaYthermostaticYexpansionYvalveY-YCORRECTYANSWERY-
bulbYpressure,YspringYpressureYandYequalizingYpressure



refrigerantYtanksYcanYonlyYbe___________YfullY-YCORRECTYANSWERY-80%



WhatYisYtareYweight?Y-YCORRECTYANSWERY-TheYweightYofYanYemptyYcylinder.



UsedYrefrigerantYthatYhasYbeenYreprocessedYtoYbringYitYupYtoYtheYstandardsYrequiredYofYnewYrefrigerantYisY
calledY_________?Y-YCORRECTYANSWERY-reclaim



AYclassYofYrefrigerantsYthatYcontainsYhydrogen,Ychlorine,Yfluorine,YandYcarbonYisYcalledY_______?Y-
YCORRECTYANSWERY-HCFCY(Hydrochlorofluorocarbon)YRefrigerant.




A(n)Y___________YisYaYheatYexchangerYthatYtransfersYheatYfromYtheYairYflowingYoverYitYtoYtheYcoolerYrefrige
rantYflowingYthroughYit.Y-YCORRECTYANSWERY-evaporator



AYclassYofYrefrigerantsYthatYcontainsYchlorine,Yfluorine,YandYcarbonYisYcalledY__________?Y-
YCORRECTYANSWERY-CFCY(Chlorofluorocrbon)Yrefrigerant.




TheYremovalYandYtemporaryYstorageYofYrefrigerantYinYcontainersYapprovedYforYthatYpurposeYisYcalledY____
_______.Y-YCORRECTYANSWERY-Recovery



AYliquidYmeteringYdeviceYisYalsoYknownYasYa(n)Y__________?Y-YCORRECTYANSWERY-expansionYdevice



WhatYdoesYtheYcondenserYdo?Y-YCORRECTYANSWERY-RemovesYlatentYheatYandYchangesYvaporYtoYliquid