EXAM (EXAM CODE A-02) QUESTIONS
WITH CORRECT ANSWERS
HeatYwhichYcausesYaYchangeYinYtemperatureYofYaYsubstanceYisYcalled;Y-YCORRECTYANSWERS-
sensibleYheat.
HeatYwhichYcausesYaYchangeYinYstateYofYaYmaterialYwithoutYaYchangeYinYtemperatureYisYcalled;Y-
YCORRECTYANSWERS-latentYheat.
HeatYwhichYisYaddedYtoYaYvaporYafterYtheYchangeYofYstateYoccursYisYcalled;Y-YCORRECTYANSWERS-
superheat.
HeatYcanYtravelYby;Y-YCORRECTYANSWERS-conduction,Yconvection,Yradiation.
TheYmovementYofYheatYbyYwayYofYfluidY(orYair)YisYcalled;Y-YCORRECTYANSWERS-convectionY.
TheYmovementYofYheatYbyYdirectYcontactYisYcalled;Y-YCORRECTYANSWERS-conductionY.
TheYstandardYunitYforYmeasuringYtheYquantityYofYheatYinYaYsubstanceYis;Y-YCORRECTYANSWERS-
theYBritishYThermalYUnitY(Btu).
AYrefrigeratYgivesYupYheatYwhen;Y-YCORRECTYANSWERS-itYcondenses.
ItYisYdesirableYforYrefrigerantYinYtheYsuctionYlineYtoYbeYslightlyYsuperheatedYinYorderYto;Y-
YCORRECTYANSWERS-insureYliquidYrefrigerantYdoesYnotYenterYtheYcompressor.
, TheYstateYofYrefrigerantYinYtheYsuctionYlineYshouldYbe;Y-YCORRECTYANSWERS-
lowYpressure/YlowYtemperature.
TheYstateYofYtheYrefrigerantYenteringYtheYcondenserYis;Y-YCORRECTYANSWERS-
highYpressure/YhighlyYsuperheatedYliquid.
TheYevaporator;Y-YCORRECTYANSWERS-TransfersYheatYfromYtheYrefrigerantYtoYtheYambientYair.
WhichYofYtheYfollowingYisYNOTYaYthermodynamicYpropertyYofYrefrigerants?
a)YCriticalYpoint.
b)YSaturationYpoint.
c)YEnthalpy.
d)YFlammability.Y-YCORRECTYANSWERS-d)YFlammability.
TheYsequentialYorderYofYstepsYinYtheYvaporY-YcompressionYprocessYare;Y-YCORRECTYANSWERS-
compression,Ycondensation,Yexpansion,Yvaporization.
IfYaY30YpoundYcylinderYofYreclaimedYR-
12YrefrigerantYhasYbeenYstoredYoverYnightYatY70°F,YtheYpressureYinYtheYcylinderYshouldYbeYapproxi
mately;Y-YCORRECTYANSWERS-70.2YPsig.
PressuresYlowerYthanYatmosphericYareYmeasuredYin;Y
a)YinchesYofYmercuryY
b)Ymicrons
c)YPsig
d)YeitherY"A"YorY"B".Y-YCORRECTYANSWERS-d)YeitherY"A"YorY"B".