HVAC CONTRACTOR EXAM QUESTIONS WITH CORRECT ANSWERS 2025

HVAC CONTRACTOR EXAM QUESTIONS
WITH CORRECT ANSWERS 2025
AnYinstrumentYthatYmeasuresYpotentialYdifferencesYbetweenY2YpointsYinYanYelectricalYcircuitYisYcalled?



A.Ypotentiometer

B.Ythermistor

C.Yohmeter

D.YvoltmeterY-YCORRECTYANSWERY-voltmeter



ThisYdeviceYusesYaYthermalYsensingYbulbYatYtheYoutletYofYtheYevaporatorYtoYsenseYtemperatureYandYcontrolY
superheat



A.YautomaticYexpansionYvalve

B.YthermostaticYexpansionYvalve

C.YlowYsideYfloat

D.YschraederYvalveY-YCORRECTYANSWERY-thermostaticYexpansionYvalve



whenYinstallingYaYreversingYvalveYonYaYheatYpump,YhowYmanyYbrazedYjointsYshouldYbeYmade?



a.Y3

b.Y5

c.Y4

d.Y2Y-YCORRECTYANSWERY-4



whatYwouldYnotYbeYconsideredYaYmisuseYofYaYcontractorsYlicense?



a.YadvertisingYunderYmulitpleYnames

b.YemployingYserviceYtechniciansYtoYworkYunderYtheirYlicense

c.YloaningYlicenseYtoYmoreYthanYoneYcompany

,d.YcontinueYtoYworkYonYanYexpiredYlicenseY-YCORRECTYANSWERY-
employingYserviceYtechniciansYtoYworkYunderYtheirYlicense



whatYisYusedYtoYpreventYmicrobiologicalYgrowthYandYhelpY"dirtyYsockyYsyndrome?



a.Yradiation

b.YultravioletYlight

c.YelectrostaticYfilters

d.YheatYratedYstaticYfiltersY-YCORRECTYANSWERY-ultravioletYlight



aYpreciselyYsizedYdrilledYholeYthroughYwhichYgasYflowsYfromYtheYmanifoldYtoYtheYburnerYisYknownYasYwhat



a.Yspud

b.YdrillYsize

c.Yorifice

d.YdimpleY-YCORRECTYANSWERY-orifice



rooftopYpackageYhvacYunitsYutilizeYeconomizersYforYwhatYprimaryYpurpose?



a.YtoYexhaustYextraYindoorYair

b.YtoYequalizeYindoor/outdoorYpressures

c.YtoYallowYoutsideYairYtoYbeYusedYforYcoolingYinYmildYweather

d.YtoYraiseYindoorYrelativeYhumidityY-YCORRECTYANSWERY-
toYallowYoutsideYairYtoYbeYusedYforYcoolingYinYmildYweather



whatYisYtheYminimumYgaugeYrequiredYforYaY12"YgalvanizedYsteelYconnectorYusedYtoYconnectYaYlowsYheatYap
pliance?



a.Y.019

b.Y.029

, c.Y.034

d.Y.2Y-YCORRECTYANSWERY-.029



afterYcuttingYpipesYtheyYmustYbeYreamedYforYwhatYpurpose?



a.YtoYcleanYpipeYthreads

b.YtoYsmoothYtheYendYofYtheYpipe

c.YtoYremoveYburrsYandYchipsYfromYtheYinside

d.YtoYhelpYtheYthreadingYprocessY-YCORRECTYANSWERY-toYremoveYburrsYandYchipsYfromYtheYinside



inYmanualYdYwhatYisYtheYsuggestedYfrictionY(IWC)YlossYforYhandYdampers?



a.Y.01

b.Y.08

c.Y.1

d.Y.03Y-YCORRECTYANSWERY-.03



aYsystemYwithYaY120YdegreeYsaturationYtemperatureYinYtheYcondenserYwithYR-
22YhasYaYliquidYlineYtemperatureYofY105Ydegrees.YwhatYdoesYtheYtemperatureYdifferenceYofY15YdegreesYrep
resent?



a.Ysuperheat

b.YwetYbulb

c.Ysubcooling

d.YairYtemperatureYdifferenceY-YCORRECTYANSWERY-subcooling



whenYaYtechnicianYusesYaYnitrogenYcylinderYtoYpressurizeYaYsystemYforYleakYdetectionYwhatYshouldYbeYused
YforYsafety




a.YhandYvalve