ELECTRICAL HVAC Final Questions and Answers 2025

ELECTRICAL HVAC Final Questions and
Answers 2025
Theabackaelectromotiveaforceaisatheaamountaofavoltageaproducedainatheastartingawindingaofa
aamotora-ACORRECTAANSWERSA-True
Thea_________aoverloadabreaksapoweratoatheamotora-ACORRECTAANSWERSA-lineabreak
Theasimplestaformaofaoverloadaprotectionaisathea-ACORRECTAANSWERSA-fuse
Dischargeaallacapacitorsawithaa(n)A__________Aohm,Afour-
wattaresistorabeforeatouchingatheaterminalsa-ACORRECTAANSWERSA-15,000
Anaalternatingacurrentaofa60ahertzachangesadirectiona100atimesaperaseconda-
ACORRECTAANSWERSA-False

Thea_____________aofaaarelayaoracontactoramustamakeagoodadirectacontactawhenaenergiz
edaforatheadeviceatoafunctionaproperlya-ACORRECTAANSWERSA-contacts
Onaallaelectricalamotors,atheastartingaamperageaisalessathanathearunningaamperageabecaus
eathearotoraisastationaryaonastartupa-ACORRECTAANSWERSA-false
Ifatheanorthapoleaofaaabaramagnetaisabroughtacloseatoatheanorthapoleaofaanotherabaramagnet,a
theya____________aeachaothera-ACORRECTAANSWERSA-repel
Theavoltageainaaaseriesacircuitaisatheasameaforaeachadevicea-ACORRECTAANSWERSA-false
Theaparallelacircuitahasaonlyaoneapathaforatheaelectronaflowa-ACORRECTAANSWERSA-false
Theatemperatureainaanyastructure,aregardlessaofaitsaage,Alocation,aoradesign,acanabeamainta
inedaatacomfortablealevelsawithaa(n)A____________A-ACORRECTAANSWERSA-thermostat
Aasetaofaburnedaorapittedacontactsacanacauseaa(n)A___________________aacrossatheacont
actsa-ACORRECTAANSWERSA-voltageadrop
Oneacycleaoccursawhenathearotor,aoraconductor,acutsatheamagneticafieldaofanorthapoleaandas
outhapolea-ACORRECTAANSWERSA-true
A(n)A_________________aisaanaelectricaladeviceathataconsumesaelectricaenergyatoarotatea
aadeviceainaanaelectricasystema-ACORRECTAANSWERSA-motor
Theapermanentamagnetaisaaapieceaofamagneticamaterialathatahasabeenamagnetizedaandaca
naholdaitsamagneticastrengthaforaaareasonablealengthaofatimea-ACORRECTAANSWERSA-
true
Aasolenoidaisanotaconsideredatoabeaaaloadabecauseaitaconsumesaveryalittleaelectricitya-
ACORRECTAANSWERSA-false

Thea________acanausuallyabeacheckedabyaturningatheamotorabyahandatoadetermineaifaharda
oraroughaspotsaexistainarotatingamovementaofatheamotora-ACORRECTAANSWERSA-
bearings
A(n)A______________acircuitaisaoneathataisabeingasuppliedawithaelectricalaenergya-
ACORRECTAANSWERSA-liveaelectrical

Theabackaelectromotiveaforceaproducedabyatheastartingawindingaofaaamotoraisanotatheacontro
llingafactoraofaaapotentialarelaya-ACORRECTAANSWERSA-false
Normallyaopenacontactsaopenaandanormallyaclosedacontactsacloseawhenathearelayaoraconta
ctoraisaenergizeda-ACORRECTAANSWERSA-false
Theadiagnosisaofaaafaultyacontactoraencompassesathreeasectionsaofatheacontactor:atheacoil,a
theacontactsaandathea_______________A-ACORRECTAANSWERSA-mechanicalalinkage

, Theaschematicadiagramaresemblesaaaladderainathataitaisamadeaupaofatwoaverticalalinesatoarep
resentaincomingaelectricalasourcesa-ACORRECTAANSWERSA-true
Thermalaoverloadadevicesaoperateabyamagnetisma-ACORRECTAANSWERSA-false
Theamostacommonatypesaofaelectricalametersausedaareatheavolt-ohm-
millammeteraandathea___________A-ACORRECTAANSWERSA-clamp-onaammeter
Inaanaopen-
typeamotor,adroppingatheastartingawindingaoutaofatheacircuitaisaaccomplishedabyaaacentrifuga
laswitchamountedaonatheamotorathataopensaonceatheamotorahasareacheda35%aofaitsafullaspee
da-ACORRECTAANSWERSA-false
Anainsulatoraisaaamaterialathatahasafreeaelectronsaavailablea-ACORRECTAANSWERSA-false
Ifatheacontrolasystemaisasetaforaheatingaandatheatemperatureainatheastructureadropsabelowath
easetapoint,atheafirstastageaofatheaheatingathermostataopensa-ACORRECTAANSWERSA-false
Thea_____________aofaanaatomaorbitaaroundatheanucleusa-ACORRECTAANSWERSA-
electrons
Theamagneticalinesaofaforceaofaaamagnetathataflowabetweenatheanorthaandasouthapolesaareac
alleda-ACORRECTAANSWERSA-flux
Inatheaunitedastatesatheacommonafrequencyaisa50ahza-ACORRECTAANSWERSA-false
Whenaelectricityaflowsanearaorathroughatheaheartaforaonlyaaashortaperiodaofatime,aitacanacaus
ea__________aofatheaheart,ainawhichatheaheartaonlyafluttersainsteadaofabeatsa-
ACORRECTAANSWERSA-ventricularafibrillation

Loadsaareadevicesasuchaasamotors,Asolenoids,aresistanceaheaters,aandaotheraconsumingad
evicesa-ACORRECTAANSWERSA-true
Anaatomaisatheasmallestaparticleaofaanaelementathatacanaexistaaloneaorainacombinationa-
ACORRECTAANSWERSA-true

Whenaelectricityapassesathroughatheabodyathearesultsacanarangeafromadeathatoaaaslight,aunc
omfortableastingingasensationadependingauponatheaamountaofaelectricityathatapassesathrou
ghatheabody,atheapathaofaitathroughatheabody,aandatheaamountaofatimeaitaflowsa-
ACORRECTAANSWERSA-true

Oneaofatheamostaimportantatingsathataaaserviceatechnicianamustalearnaisahowatoasafelyaworka
aroundaequipmentawhenatheapoweraisabeingasuppliedatoatheaequipmenta-
ACORRECTAANSWERSA-true

Anaelectrodeaisaaasolidaconductorathroughawhichaanaelectricacurrentacanapassa-
ACORRECTAANSWERSA-true

ITAISANOTASAFEATOAWEARAJEWLRYAWHENAWORKINGANEARAELECTRICITYA-
ACORRECTAANSWERSA-

Alternatingacurrentareachesaaapeakaata_________aelectricaladegreesaalsoaknownaasapeaka
voltagea-ACORRECTAANSWERSA-90
Thea_________acircuitaallowsaonlyaoneapathaofacurrentaflowathroughatheacircuita-
ACORRECTAANSWERSA-series

Blahablaha-ACORRECTAANSWERSA-
Thea_____________ahasaitsaownapowerasupplyaandausesatheadeviceabeingacheckedaasathe
aloadatoaproduceaaamagneticafielda-ACORRECTAANSWERSA-ohmmeter

Thea__________adiagramanotaonlyaindetifiesatheaelectricalacomponetsathataareainatheaunitab
utaalsoaillustratesahowatheaunitaworksaandaelectricalaconnectionsaneedatoabeamadea-
ACORRECTAANSWERSA-schematic