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HVAC EXCELLENCE TEST COMMERCIAL AC EXAM QUESTIONS WITH CORRECT ANSWERS RATED A+.pdf

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2025/2026 Written for academic year
Institution DC MASTER AIR CONDITIONING AND REFRIGERATION
Course DC MASTER AIR CONDITIONING AND REFRIGERATION
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HVAC EXCELLENCE TEST COMMERCIAL AC EXAM QUESTIONS WITH CORRECT ANSWERS RATED A+.pdf

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HVAC EXCELLENCE TEST
COMMERCIAL AC EXAM QUESTIONS
WITH CORRECT ANSWERS RATED A+
CondenserHfan-cyclingHcontrolsHhaveHtheHsameHactionHasHaHlow-pressureHcontrolHexceptHit:H-
HCORRECTHANSWERS-IsHusedHtoHcontrolHtheHhighHpressureHalso.




AHslingHpsychometerHisHusedHtoHmeasureH-HCORRECTHANSWERS-wetHandHdryHbulbHtemperature.



SomeHcompressorsHareHfittedHwithHanHunloadingHdeviceHtoH-HCORRECTHANSWERS-
provideHvariableHcapacity.



CompressorHnetHoilHpressureHisHdeterminedHbyH-HCORRECTHANSWERS-
oilHpumpHdischargeHpressureHminusHsuctionHpressure.



AHcompressorHisHoperatingHwithHaHdischargeHpressureHofH185.3HpsigHandHaHsuctionHpressureHofH25.
3Hpsig.HTheHcompressionHratioH(pumpingHratio)His:H-HCORRECTHANSWERS-5:1



GotHGasHBypassHrefersHtoHaHmethodHofH-HCORRECTHANSWERS-preventingHlowHsuctionHpressure.



TheHcapacityHofHaHcoolingHtowerHdependsHonHtheH-HCORRECTHANSWERS-
EnteringHairHwetHbulbHtemperature.



WetHbulbHdepressionHisHtheHdifferenceH-HCORRECTHANSWERS-
betweenHwetHbulbHandHdryHbulbHtemperatures.



RefrigerantHinHtheHsuctionHlightHshouldHbeHslightlyHsuperheatedHinHorderHtoH-HCORRECTHANSWERS-
insureHliquidHrefrigerantHdoesHnotHenterHtheHcompressor.

, OnHsplitHsystemHinstallations,HtheHsuctionHlineHshouldHbeHpitchedHtowardsHtheHcompressorHatHleas
tH-HCORRECTHANSWERS-OneHinchHperHtenHfeet.



TheHmostHreliableHandHsafestHmethodHofHfieldHchargingHaHsystemHisHtoHchargeH-
HCORRECTHANSWERS-byHweightHaccordingHtoHtheHmanufacturer'sHspecifications




ApproximatelyHhowHmuchHairflowHisHrequiredHacrossHtheHevaporatorHperHtonHofHcoolingHcapacity?
H-HCORRECTHANSWERS-350-450HcfmHperHton




theHamountHofHheatHabsorbedHinHtheHevaporatorHisHequalHtoHtheHheatH-HCORRECTHANSWERS-
givenHoffHbyHtheHcondenserHminusHtheHheatHofHcompression.



IfHaHTEVHsensingHbulbHhasHlostHallHofHitsHcharge,HwhatHeffectHwouldHthisHhaveHonHtheHairHconditioni
ngHsystem?H-HCORRECTHANSWERS-ItHwouldHcauseHlowHsideHpressureHtoHincrease.



AHdecreaseHinHwaterHflow,HwhenHusingHaHwaterH-HcooledHcondenserH-HCORRECTHANSWERS-
increasesHtheHpowerHconsumptionHofHtheHcompressor.



HighHcompressorHoperatingHtemperaturesHcanHbeHcausedHbyH-HCORRECTHANSWERS-
highHcompressionHratios.



WhatHisHtheHpurposeHofHaHdistributor?H-HCORRECTHANSWERS-
ItHevenlyHfeedsHrefrigerantHtoHtheHevapaorator



UponHinvestigationHofHaH"noHcooling"Hcomplaint,HtheHtechnicianHfindsHthatHtheHblowerHmotorHofHt
heHairHhandlerHhasHopenHwindings.HOneHweekHago,HthisHsameHunitHwasHfoundHtoHhaveHaHbrokenHb
eltHcausedHbyHaHwornHdriveHpulley.HBothHtheHbeltHandHpulleyHwereHreplacedHatHthatHtime.HTheHtec
hnicianHdecidesHtoHreplaceHtheHmotorHand;H-HCORRECTHANSWERS-
adjustHtheHdriveHpulleyHtoHdecreaseHampHdraw.

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