NATE AC SERVICE CERTIFICATION ACTUAL QUESTIONS AND CORRECT ANSWERS

NATE AC SERVICE CERTIFICATION ACTUAL
QUESTIONS AND CORRECT ANSWERS

ABsystemBisBsuppliedBfromBtheBfactoryBwithBchargeBofB5BpoundsB10BouncesBforBaB15BfootBlineBset.BT
heBlineBsetBisB25BfeetBlong.BTheBmanufacturer'sBinstructionBsheetBspecifiesB0.6BouncesBofBrefrigerat
ionBtoBbeBaddedBforBeachBaddedBfootBofBrefrigerantBlineBsetBlength.BWhatBisBtheBtotalBrefrigerantBc
hargeBforBtheBsystem?



A.B6Bounces

B.B5Bpounds

C.B5BpoundsB10Bounces

D.B6BpoundsB-BCORRECTBANSWER-D.B6BpoundsB



15ftB-B25ftB=B10ftBxB.6B=B6Bounces

5BpoundsB+B10BouncesB+B6Bounces

5BpoundsB+B16BouncesB=B6Bpounds

TheBpurposeBofBusingBfluxBwhenBsolderingBisBto:



A.BannealBtheBsurface.

B.BgiveBbetterBheatBflow.

C.BreduceBoxidation.

D.Bpre-sealBtheBoxidation.B-BCORRECTBANSWER-C.BreduceBoxidation.

OutdoorBcondensingBunitsBthatBareBinstalledBinBareasBwhereBfloodingBisBpossibleBmust:



A.BbeBmountedBaboveBfloodBlevel.

B.ButilizeBNEMAB1Benclosures.

,C.BbeBmountedBunderBanBoverhangingBeave.

D.BuseBwaterBresistantBcomponents.B-BCORRECTBANSWER-A.BbeBmountedBaboveBfloodBlevel.

TheBcomponentBusedBtoBreduceBsoundBtransmissionBandBpreventBwaterBleaksBonBaBrooftopBairBcon
ditionerBpackagedBunitBinstallationBisBthe:



A.BcurbBgasket.

B.BsiliconeBcaulk.

C.BroofBflashing.

D.BroofingBtar.B-BCORRECTBANSWER-A.BcurbBgasket.

ReturnBairBleakageBinBaBhotBatticBwill:



A.BIncreaseBcapacity

B.BDecreaseBcapacity

C.BIncreaseBairflow

D.BDecreaseBairflowB-BCORRECTBANSWER-B.BDecreaseBcapacity

AnBairBconditionerBrefrigerantBcircuitBshouldBbeBevacuatedBtoBaBminimumBof:



A.B0Bmicrons.

B.B200Bmicrons.

C.B500Bmicrons.

D.B1200Bmicrons.B-BCORRECTBANSWER-C.B500Bmicrons.

WhichBofBtheBfollowingBsubstancesBcouldBcreateBanBextremelyBdangerousBconditionBifBusedBtoBche
ckBrefrigerationBsystemBforBleaks?



A.BR-22

B.BNitrogen

C.BOxygen

, D.BCarbonBDioxideB-BCORRECTBANSWER-D.BCarbonBDioxide

TheBsubcoolingBmethodBforBcheckingBchargeBisBgenerallyBusedBonBairBconditionersBwithBwhatBtypeB
ofBmetering?



A.BOnlyBexternallyBequalizedBthermostaticBexpansionBvalves

B.BAnyBthermostaticBexpansionBvalve

C.BPistonBtype

D.BAnyBfixedBmeteringBdeviceB-BCORRECTBANSWER-B.BAnyBthermostaticBexpansionBvalve

SupplyBductsBrunningBthroughBunconditionedBspaceBshouldBbeBinsulatedBandBhave:



A.BequalBfriction.

B.BexcessiveBairBvelocity.

C.BaBvaporBbarrier.

D.BaBtransitionBbacking.B-BCORRECTBANSWER-C.BaBvaporBbarrier.

AnBimportantBconsiderationBwhenBinstallingBaBmotorizedBeconomizerBisBtoBcheckBtoBbeBcertainBtha
t:



A.BtheBvanesBareBsetBforBaBmaximumB10%BoutdoorBair.

B.BtheBvanesBopenBonBanyBcallBforBcooling.

C.BtheBvanesBoperateBwithoutBbinding.

D.BtheBvanesBareBpermanentlyBsetBatB50%.B-BCORRECTBANSWER-
C.BtheBvanesBoperateBwithoutBbinding.

OnBaB3BtonBunitBinstallation,BtheBmeasureBairflowBequalsB1550BCFM.BWhatBdoesBthisBindicate?



A.BProperBbalancing

B.BLowBAirflow

C.BExcessBairflow