HVAC Excellence Exam Study Guide #2
Questions and Answers
CurrentAflowAisA-ACORRECTAANSWERSA-TheAflowAofAelectronsAinAaAcircuit
ImpedanceAisA-ACORRECTAANSWERSA-OppositionAtoAalternatingAcurrentAflow
LikeAchargesA-ACORRECTAANSWERSA-RepelAeachAother
AnyAmaterialAthatAwillAreadilyAreleaseAelectorsAisAcalledA-ACORRECTAANSWERSA-
AAconductor
TheAsymbolAforAcurrentAisA-ACORRECTAANSWERSA-I
WhichAofAtheAfollowingAmaterialsAwouldAbeAbestAsuitedAforAuseAasAaAsemi-conductor?A-
ACORRECTAANSWERSA-Silicon
TheAsafeAgroundAconductorAisAusuallyAcolorAcodedA-ACORRECTAANSWERSA-
GreenAorAbare
AnAelectronAhasA-ACORRECTAANSWERSA-AAnegativeAcharge
ResistanceAisA-ACORRECTAANSWERSA-OppositionAtoAcurrentAflow
HowAmanyAwattsAofApowerAareAusedAbyAaAheaterAoperatingAatA240AvoltAandAdrawingA5Aam
ps?A-ACORRECTAANSWERSA-1200Awatts
WhichAofAtheAfollowingAmetersAmustAuseAitsAinternalApowerAtoAcheckAaAloadAorAaAcircuitA-
ACORRECTAANSWERSA-Ohmmeter
InAelectricalAwiring,AaAblackAcoloredAwireAinAanAalternatingAcurrentAcircuitAusuallyAIndicatesA
-ACORRECTAANSWERSA-AAhotAconductor
FusesAareAsizedAbyA-ACORRECTAANSWERSA-VoltsAandAamps
WhatAwouldAbeAtheAresult,AifAaA24Avolt,A20-
ohmAlowAvoltageAcontractorAcoilAwereAwiredAinAseriesAwithAaA24Avolt,A200-
ohmAcontrolArelayAcoil?A-ACORRECTAANSWERSA-OnlyAtheAcontrolArelayAwouldAoperate
ThreeAdefrostAheaters,AeachA15AohmsAareAwiredAinAparallelAtoAaA120AvoltApowerAsupply.AH
owAmanyAwattsAofApowerAwillAbeAused?A-ACORRECTAANSWERSA-2880Awatts
WhichAofAtheAfollowingAisAgenerallyAconsideredAtoAbeAwithinAtheAmaximumAallowableA(plus
AorAminus)AsupplyAvoltageAvariation?A-ACORRECTAANSWERSA-5%
CapacitorsAareAratedAinA-ACORRECTAANSWERSA-MicrofaradsAandAvolts
WhenAtestingAaAcapacitorAwithAanAanalogAorAdigitalAohmmeter,AtheAmeterAshould;A-
ACORRECTAANSWERSA-MeasureAlowAresistanceAthenAreturnAtoAaAhighAreading
WhatAisAtheAtermAusedAtoAdescribeAtheAoutputAsideAofAaAtransformer?A-
ACORRECTAANSWERSA-SecondaryAside
OneAhorsepowerAisAequalAtoA_______AwattsA-ACORRECTAANSWERSA-746
HowAmuchAresistanceAmustAbeAplacedAinAaA120AvoltAcircuitAinAorderAtoAlimitAtheAcurrentAtoA
2Aamps?A-ACORRECTAANSWERSA-60Aohms
AAparallelAcircuitAcontainsAaA18AohmAandA9AohmAresistor.ATheAtotalAresistanceAequals;A-
ACORRECTAANSWERSA-6Aohms
InAaAseriesAcircuit,AtheAvoltageAdropAacrossAeachAresistanceA(load)Awill;A-
ACORRECTAANSWERSA-AddAupAtoAequalAtheAsourceAvoltage
TheAtotalAresistanceAofAaAparallelAcircuitAwillAbe;A-ACORRECTAANSWERSA-
LessAthanAtheAsmallestAresistance
Questions and Answers
CurrentAflowAisA-ACORRECTAANSWERSA-TheAflowAofAelectronsAinAaAcircuit
ImpedanceAisA-ACORRECTAANSWERSA-OppositionAtoAalternatingAcurrentAflow
LikeAchargesA-ACORRECTAANSWERSA-RepelAeachAother
AnyAmaterialAthatAwillAreadilyAreleaseAelectorsAisAcalledA-ACORRECTAANSWERSA-
AAconductor
TheAsymbolAforAcurrentAisA-ACORRECTAANSWERSA-I
WhichAofAtheAfollowingAmaterialsAwouldAbeAbestAsuitedAforAuseAasAaAsemi-conductor?A-
ACORRECTAANSWERSA-Silicon
TheAsafeAgroundAconductorAisAusuallyAcolorAcodedA-ACORRECTAANSWERSA-
GreenAorAbare
AnAelectronAhasA-ACORRECTAANSWERSA-AAnegativeAcharge
ResistanceAisA-ACORRECTAANSWERSA-OppositionAtoAcurrentAflow
HowAmanyAwattsAofApowerAareAusedAbyAaAheaterAoperatingAatA240AvoltAandAdrawingA5Aam
ps?A-ACORRECTAANSWERSA-1200Awatts
WhichAofAtheAfollowingAmetersAmustAuseAitsAinternalApowerAtoAcheckAaAloadAorAaAcircuitA-
ACORRECTAANSWERSA-Ohmmeter
InAelectricalAwiring,AaAblackAcoloredAwireAinAanAalternatingAcurrentAcircuitAusuallyAIndicatesA
-ACORRECTAANSWERSA-AAhotAconductor
FusesAareAsizedAbyA-ACORRECTAANSWERSA-VoltsAandAamps
WhatAwouldAbeAtheAresult,AifAaA24Avolt,A20-
ohmAlowAvoltageAcontractorAcoilAwereAwiredAinAseriesAwithAaA24Avolt,A200-
ohmAcontrolArelayAcoil?A-ACORRECTAANSWERSA-OnlyAtheAcontrolArelayAwouldAoperate
ThreeAdefrostAheaters,AeachA15AohmsAareAwiredAinAparallelAtoAaA120AvoltApowerAsupply.AH
owAmanyAwattsAofApowerAwillAbeAused?A-ACORRECTAANSWERSA-2880Awatts
WhichAofAtheAfollowingAisAgenerallyAconsideredAtoAbeAwithinAtheAmaximumAallowableA(plus
AorAminus)AsupplyAvoltageAvariation?A-ACORRECTAANSWERSA-5%
CapacitorsAareAratedAinA-ACORRECTAANSWERSA-MicrofaradsAandAvolts
WhenAtestingAaAcapacitorAwithAanAanalogAorAdigitalAohmmeter,AtheAmeterAshould;A-
ACORRECTAANSWERSA-MeasureAlowAresistanceAthenAreturnAtoAaAhighAreading
WhatAisAtheAtermAusedAtoAdescribeAtheAoutputAsideAofAaAtransformer?A-
ACORRECTAANSWERSA-SecondaryAside
OneAhorsepowerAisAequalAtoA_______AwattsA-ACORRECTAANSWERSA-746
HowAmuchAresistanceAmustAbeAplacedAinAaA120AvoltAcircuitAinAorderAtoAlimitAtheAcurrentAtoA
2Aamps?A-ACORRECTAANSWERSA-60Aohms
AAparallelAcircuitAcontainsAaA18AohmAandA9AohmAresistor.ATheAtotalAresistanceAequals;A-
ACORRECTAANSWERSA-6Aohms
InAaAseriesAcircuit,AtheAvoltageAdropAacrossAeachAresistanceA(load)Awill;A-
ACORRECTAANSWERSA-AddAupAtoAequalAtheAsourceAvoltage
TheAtotalAresistanceAofAaAparallelAcircuitAwillAbe;A-ACORRECTAANSWERSA-
LessAthanAtheAsmallestAresistance