HVAC TEST QUESTIONS WITH CORRECT
ANSWERS 2025
YouYareYtheYrefrigerationYengineerYrunningYaY2000Y-
YtonYcentrifugalYrefrigerationYsystem.YTheYsystemYsuppliesYchilledYwaterYtoYaYcollegeYcampusYwithYmultipleY
buildings.YYouYhaveYnormalYchilledYwaterYloadYaboutY1800YtonsYwhenYtheYrefrigerationYsystemYsuddenlyYst
opsYandYshutsYdown.YTheYpanelYdisplayYonYtheYrefrigerationYsystemYindicatesYthatYtheYproblemYisYwithYtheY
waterYflow.YofYtheYfollowing,YwhichYimmediateYactionYwouldYbeYbest?Y-YCORRECTYANSWERY-
checkYtheYcondenserYwaterYpumpYandYre-startYtheYrefrigerationYsystem
TheYsoleYrefrigerationYengineerYonYdutyYinYaYbuildingYisYpermittedYtoYleaveYtheYbuildingYwhenYtheYrefrigera
tionYsystemYisYinYoperationYonlyYwhen?Y-YCORRECTYANSWERY-
relievedYbyYanotherYlicensedYrefrigerationYengineer
ThisYisYaYreciprocatingYcompressorYusingYR-
22Yrefrigerant.YIdentifyYtheYobjectYcontainedYinYtheYredYbox,YexplainYtheYpurposeYofYit?Y-
YCORRECTYANSWERY-oilYchargingYport,YallowsYforYtheYadditionYandYremovalYofYoilYfromYtheYcompressor
InYmostYsemi-hermeticYcompressors,YtheYsuctionYvaporYisYusedYto?Y-YCORRECTYANSWERY-coolYtheYmotor
2.5YGallonsYofYwaterYequalsYwhat?Y-YCORRECTYANSWERY-2.5YgallonsYofYwaterYweighsY20.8Ypounds
RegardingYtheYfunctioningYofYaYsteamYturbine,YwhyYisYitYadvisableYtoYkeepYtheYmoistureYinYtheYinletYsteamY
asYlowYasYpossible?Y-YCORRECTYANSWERY-keepsYturbineYbladeYwearYtoYaYminimum
AYrooftopYwaterYcoolingYtowerYisYconnectedYtoYaYwaterYpumpYinYtheYbuildingYbasementYwithYaY12YinchYdia
meterYpipe.YWithYtheYpumpYturnedYoff,YaYpressureYgaugeYatYtheYpumpsYinletYshowsYaYpressureYofY140Ypsi.Y
TheYheightYofYtheYcolumnYinYfeetYwouldYbeYclosestYto:Y-YCORRECTYANSWERY-323
YouYareYanYengineerYrunningYaY2000-tonY(Ysteam-
drivenYturbineY)YcentrifugalYrefrigerationYsystem.YTheYrefrigerationYsystemYsuppliesYchilledYwaterYtoYaYcolle
geYcampusYwithYmultipleYbuildings.
YDuringYtheYcourseYofYmakingYyourYrounds,YyouYcheckYtheY9-
cellYcoolingYtowerYonYtheYroof.YYouYnoteYthatYtheYwaterYlevelYinYallYofYtheYcoolingYtowerYcellsYisYveryYlow.
ANSWERS 2025
YouYareYtheYrefrigerationYengineerYrunningYaY2000Y-
YtonYcentrifugalYrefrigerationYsystem.YTheYsystemYsuppliesYchilledYwaterYtoYaYcollegeYcampusYwithYmultipleY
buildings.YYouYhaveYnormalYchilledYwaterYloadYaboutY1800YtonsYwhenYtheYrefrigerationYsystemYsuddenlyYst
opsYandYshutsYdown.YTheYpanelYdisplayYonYtheYrefrigerationYsystemYindicatesYthatYtheYproblemYisYwithYtheY
waterYflow.YofYtheYfollowing,YwhichYimmediateYactionYwouldYbeYbest?Y-YCORRECTYANSWERY-
checkYtheYcondenserYwaterYpumpYandYre-startYtheYrefrigerationYsystem
TheYsoleYrefrigerationYengineerYonYdutyYinYaYbuildingYisYpermittedYtoYleaveYtheYbuildingYwhenYtheYrefrigera
tionYsystemYisYinYoperationYonlyYwhen?Y-YCORRECTYANSWERY-
relievedYbyYanotherYlicensedYrefrigerationYengineer
ThisYisYaYreciprocatingYcompressorYusingYR-
22Yrefrigerant.YIdentifyYtheYobjectYcontainedYinYtheYredYbox,YexplainYtheYpurposeYofYit?Y-
YCORRECTYANSWERY-oilYchargingYport,YallowsYforYtheYadditionYandYremovalYofYoilYfromYtheYcompressor
InYmostYsemi-hermeticYcompressors,YtheYsuctionYvaporYisYusedYto?Y-YCORRECTYANSWERY-coolYtheYmotor
2.5YGallonsYofYwaterYequalsYwhat?Y-YCORRECTYANSWERY-2.5YgallonsYofYwaterYweighsY20.8Ypounds
RegardingYtheYfunctioningYofYaYsteamYturbine,YwhyYisYitYadvisableYtoYkeepYtheYmoistureYinYtheYinletYsteamY
asYlowYasYpossible?Y-YCORRECTYANSWERY-keepsYturbineYbladeYwearYtoYaYminimum
AYrooftopYwaterYcoolingYtowerYisYconnectedYtoYaYwaterYpumpYinYtheYbuildingYbasementYwithYaY12YinchYdia
meterYpipe.YWithYtheYpumpYturnedYoff,YaYpressureYgaugeYatYtheYpumpsYinletYshowsYaYpressureYofY140Ypsi.Y
TheYheightYofYtheYcolumnYinYfeetYwouldYbeYclosestYto:Y-YCORRECTYANSWERY-323
YouYareYanYengineerYrunningYaY2000-tonY(Ysteam-
drivenYturbineY)YcentrifugalYrefrigerationYsystem.YTheYrefrigerationYsystemYsuppliesYchilledYwaterYtoYaYcolle
geYcampusYwithYmultipleYbuildings.
YDuringYtheYcourseYofYmakingYyourYrounds,YyouYcheckYtheY9-
cellYcoolingYtowerYonYtheYroof.YYouYnoteYthatYtheYwaterYlevelYinYallYofYtheYcoolingYtowerYcellsYisYveryYlow.
