HVAC EXAM 1 QUESTIONS WITH
CORRECT ANSWERS RATED A+
MatterWexistsWinWwhatWthreeWforms?W-WCORRECTWANSWERS-solid,Wliquid,Wgas
WhatWisWtemperatureWmeasuredWby?WQuantityWorWintensityW-WCORRECTWANSWERS-Intensity
DefineWBritishWthermalWunitW(Btu)W-WCORRECTWANSWERS-MeasureWofWheatWenergyW-
WamountWofWenergyWneededWtoWraiseW1WlbWofWwaterW1WdegreeWF
HowWmuchWheatWisWrequiredWtoWraiseWtheWtempWofW100WlbWorWwaterWfromW70FWtoW120FW-
WCORRECTWANSWERS-Q=1000lb*(1btuW/WchangeWofWtemp)
soW1000*(1/W50)W=W50,000
IfW750WBtuWisWsuppliedWtoW15lbWofWwaterWatW72FWwhatWwillWbeWtheWresultingWtemperature?W-
WCORRECTWANSWERS-
1WBtuWraisesWairW-WCORRECTWANSWERS-4.75F
ToWmeltW1lbWofWiceWyouWneedW-WCORRECTWANSWERS-144WBtu
SoWtoWmeltW2000WlbsWofWiceWorW1WtonWyouWneedW-WCORRECTWANSWERS-288,000WBtu
WhatWisW1WtonWofWrefrigeration?W-WCORRECTWANSWERS-288,000WBtuW/W24WhrsW=W12,000WBtu/Hr
WhatWisWtheWhottestWwaterWcanWget?W-WCORRECTWANSWERS-212F
1WBtuWraisesW1WlbWofWwaterW-WCORRECTWANSWERS-1WdegreeWF
, IfW750WBtuWisWsuppliedWtoW15Wlb.WofWwaterWatW72F,WwhatWwillWbeWtheWresultingWtemperature?W-
WCORRECTWANSWERS-750/15=50F
50FW+W72FW=W122F
LatentWheatWcannotWbeWmeasuredWonWaWthermometer.WTrueWorWfalse?W-WCORRECTWANSWERS-
TrueW-WonlyWsensibleWheatWcanWbeWrecorded-
WlatentWheatWisWaWchangeWinWmassWEX)Wvaporization,Wcondensation,Wfusion,Wmelting
HowWmuchWheatWneedsWtoWbeWremovedWtoWdropWtheWtemperatureWofW1000WcfmWofWairWfromW70
FWtoW55F.W-WCORRECTWANSWERS-Q=W1.08*CFM*ChangeWinWTemp
CFMWcubicWfeet/minW
makeWsureWitWisWgivenWtoWyouWinWCFMWorWconvertWitWfromWsecondsWtoWminWorWhoursWtoWmin
TheWheatWthatWchangesWtheWtemperatureWofWaWsubstanceWisWcalledW-WCORRECTWANSWERS-
SensibleWheat
TheWheatWthatWchangesWtheWstateWofWaWsubstanceWisWcalledW-WCORRECTWANSWERS-LatentWheat
TheWheatWthatWchangesWaWliquidWtoWaWvaporWisWcalledWtheWheatWofW-WCORRECTWANSWERS-
Vaporization
AWtonWofWrefrigerantWisW-WCORRECTWANSWERS-
TheWamountWofWcoolingWaWtonWofWiceWcanWdoWinW24Whours
144WBtuW=W1WlbWofWice
2,000WlbsWofWiceW(1Wton)W=W288,000
288,000WBtuW/W24WhrsW=W12,000WBtu/Hr
CORRECT ANSWERS RATED A+
MatterWexistsWinWwhatWthreeWforms?W-WCORRECTWANSWERS-solid,Wliquid,Wgas
WhatWisWtemperatureWmeasuredWby?WQuantityWorWintensityW-WCORRECTWANSWERS-Intensity
DefineWBritishWthermalWunitW(Btu)W-WCORRECTWANSWERS-MeasureWofWheatWenergyW-
WamountWofWenergyWneededWtoWraiseW1WlbWofWwaterW1WdegreeWF
HowWmuchWheatWisWrequiredWtoWraiseWtheWtempWofW100WlbWorWwaterWfromW70FWtoW120FW-
WCORRECTWANSWERS-Q=1000lb*(1btuW/WchangeWofWtemp)
soW1000*(1/W50)W=W50,000
IfW750WBtuWisWsuppliedWtoW15lbWofWwaterWatW72FWwhatWwillWbeWtheWresultingWtemperature?W-
WCORRECTWANSWERS-
1WBtuWraisesWairW-WCORRECTWANSWERS-4.75F
ToWmeltW1lbWofWiceWyouWneedW-WCORRECTWANSWERS-144WBtu
SoWtoWmeltW2000WlbsWofWiceWorW1WtonWyouWneedW-WCORRECTWANSWERS-288,000WBtu
WhatWisW1WtonWofWrefrigeration?W-WCORRECTWANSWERS-288,000WBtuW/W24WhrsW=W12,000WBtu/Hr
WhatWisWtheWhottestWwaterWcanWget?W-WCORRECTWANSWERS-212F
1WBtuWraisesW1WlbWofWwaterW-WCORRECTWANSWERS-1WdegreeWF
, IfW750WBtuWisWsuppliedWtoW15Wlb.WofWwaterWatW72F,WwhatWwillWbeWtheWresultingWtemperature?W-
WCORRECTWANSWERS-750/15=50F
50FW+W72FW=W122F
LatentWheatWcannotWbeWmeasuredWonWaWthermometer.WTrueWorWfalse?W-WCORRECTWANSWERS-
TrueW-WonlyWsensibleWheatWcanWbeWrecorded-
WlatentWheatWisWaWchangeWinWmassWEX)Wvaporization,Wcondensation,Wfusion,Wmelting
HowWmuchWheatWneedsWtoWbeWremovedWtoWdropWtheWtemperatureWofW1000WcfmWofWairWfromW70
FWtoW55F.W-WCORRECTWANSWERS-Q=W1.08*CFM*ChangeWinWTemp
CFMWcubicWfeet/minW
makeWsureWitWisWgivenWtoWyouWinWCFMWorWconvertWitWfromWsecondsWtoWminWorWhoursWtoWmin
TheWheatWthatWchangesWtheWtemperatureWofWaWsubstanceWisWcalledW-WCORRECTWANSWERS-
SensibleWheat
TheWheatWthatWchangesWtheWstateWofWaWsubstanceWisWcalledW-WCORRECTWANSWERS-LatentWheat
TheWheatWthatWchangesWaWliquidWtoWaWvaporWisWcalledWtheWheatWofW-WCORRECTWANSWERS-
Vaporization
AWtonWofWrefrigerantWisW-WCORRECTWANSWERS-
TheWamountWofWcoolingWaWtonWofWiceWcanWdoWinW24Whours
144WBtuW=W1WlbWofWice
2,000WlbsWofWiceW(1Wton)W=W288,000
288,000WBtuW/W24WhrsW=W12,000WBtu/Hr
