HVAC Excellence - ELECTRICITY Exam Questions and Answers 2025

HVAC Excellence - ELECTRICITY Exam
Questions and Answers 2025
CurrentAflowAis:A-ACORRECTAANSWERSA-TheAflowAofAelectronsAinAtheAcircuit.
ImpedanceAis:A-ACORRECTAANSWERSA-OppositionAtoAalternatingAcurrentAflow.
LikeAcharges;A-ACORRECTAANSWERSA-repelAeachAother.
AnyAmaterialAthatAwillAreadilyAreleaseAelectronsAisAcalled;A-ACORRECTAANSWERSA-
AAconductor
TheAsymbolAforAcurrentAis;A-ACORRECTAANSWERSA-I
WhichAofAtheAfollowingAmaterialsAwouldAbeAbestAsuitedAforAuseAasAaAsemi-conductor?A-
ACORRECTAANSWERSA-silicon

TheAsafetyAgroundAconductorAisAusuallyAcolorAcoded;A-ACORRECTAANSWERSA-
greenAorAbare.
AnAelectronAhas;A-ACORRECTAANSWERSA-aAnegativeAcharge.
ResistanceAis:A-ACORRECTAANSWERSA-OppositionAtoAcurrentAflow.
HowAmanyAwattsAofApowerAareAusedAbyAaAheaterAoperatingAatA240AvoltsAandAdrawingA5Aam
ps?A-ACORRECTAANSWERSA-1200Awatts
WhichAofAtheAfollowingAmetersAmustAuseAitsAinternalApowerAtoAcheckAaAloadAorAcircuit?A-
ACORRECTAANSWERSA-Ohmmeter

InAelectricalAwiring,AaAblackAcoloredAwireAinAanAalternatingAcurrentAcircuitAusuallyAindicates;
A-ACORRECTAANSWERSA-theAhotAconductor.

FusesAareAsizedAby:A-ACORRECTAANSWERSA-VoltsA&AAmps
WhatAwouldAbeAtheAresult,AifAaA24Avolt,A20-
ohmAlowAvoltageAcontaActorAcoilAwereAwiredAinAseriesAwithAaA24Avolt,A200-
ohmAcontrolArelayAcoil?A-ACORRECTAANSWERSA-OnlyAtheAcontrolArelayAwouldAoperate.
ThreeAdefrostAheaters,AeachA15AohmsAareAwiredAinAparallelAtoAaA120AvoltApowerAsupply.AH
owAmanyAwattsAofApowerAwillAbeAused?A-ACORRECTAANSWERSA-2880AWatts
WhichAofAtheAfollowingAisAgenerallyAconsideredAtoAbeAwithinAtheAmaximumAallowableA(plus
AorAminus)AsupplyAvoltageAvariation?A-ACORRECTAANSWERSA-5%

CapacitorsAareAratedAinA-ACORRECTAANSWERSA-MicrofaradsA&AVolts.
WhenAtestingAaAcapacitorAwithAanAanalogAorAdigitalAohmmeter,AtheAmeterAshould;A-
ACORRECTAANSWERSA-measureAlowAresistanceAthenAreturnAtoAhighAreading.

WhatAisAtheAtermAusedAtoAdescribeAtheAoutputAsideAofAaAtransformer?A-
ACORRECTAANSWERSA-SecondaryAside.

OneAhorsepowerAisAequalAtoA__________Awatts.A-ACORRECTAANSWERSA-746
HowAmuchAresistanceAmustAbeAplacedAinAaA120AvoltAcircuitAinAorderAtoAlimitAtheAcurrentAtoA
2Aamps?A-ACORRECTAANSWERSA-60AOhms
AAparallelAcircuitAcontainsAaA18AohmAandAaA9AohmAresistor.ATheAtotalAresistanceAequals;A-
ACORRECTAANSWERSA-6Aohms.

InAaAseriesAcircuit,AtheAvoltageAdropAacrossAeachAresistanceA(load)Awill.A-
ACORRECTAANSWERSA-addAupAtoAequalAtheAsourceAvoltage.

TheAtotalAresistanceAofAaAparallelAcircuitAwillAbe;A-ACORRECTAANSWERSA-
lessAthanAtheAsmallestAresistance.

, WhichAofAtheAfollowingAstatementsAaboutAcurrentAisAtrue?A-ACORRECTAANSWERSA-
CurrentAflowAwillAincreaseAwhenAvoltageAincreases.
WhenAresistorsAareAwiredAinAparallel;A-ACORRECTAANSWERSA-
theAvoltageAdropAacrossAeachAresistorAwillAbeAtheAsameAasAtheAappliedAsource
WhichAofAtheAfollowingAisAequalAtoA2.1KW?A-ACORRECTAANSWERSA-2,100AWatts
WhichAofAtheAfollowingAisAequalAtoA100Amilliamps?A-ACORRECTAANSWERSA-
0.10Aamperes
AAcapacitorAanalyzerAisAdesignedAtoAread;A-ACORRECTAANSWERSA-
theAcapacitiveAresistanceAofAaAcapacitor.
OnAanAelectronicAoilAsafetyAswitchAwhatAchangesAtheApressureAsingalAtoAelectricalAsignal?A
-ACORRECTAANSWERSA-Transducer.
TheAelectricAmeterAonAaAhouseAmeasuresAtheA______________ApassingAthAroughAit.A-
ACORRECTAANSWERSA-wattage

AAthreeAphaseAloadArequiresAaAminimumAof;A-ACORRECTAANSWERSA-threeAsupplyAlines.
WhichAofAtheAfollowingAisAtheAcorrectAformulaAforAdeterminingAwattageAinAanAelectricalAcirc
uit?A-ACORRECTAANSWERSA-WA=AEAtimesAI
AAparallelAcircuitAconsistsAofAthreeAresistors.R1A=A30AOhms,AR2A=A15AOhms,AR3A=A10AOhm
s.AIfAtheAcurrentAthroughAR2AisA4AAmpsA(IA=A4AAmps),AwhatAisAtheAsourceAVoltage?A-
ACORRECTAANSWERSA-60Avolts

ThreeA300AohmAresistorsAareAwiredAinAparallel.ATheAtotalAresistanceAequals;A-
ACORRECTAANSWERSA-100Aohms

AnAelectronicallyAcommutatedAmotorA(ECM)AisAdesignedAto;A-ACORRECTAANSWERSA-
provideAproperAairAflowAunderAvariousAconditions.
ResistanceAcanAbeAcalculatedAby:A-ACORRECTAANSWERSA-EAdividedAbyAI.
DividedAVoltageAcanAbeAcalculatedAby;A-ACORRECTAANSWERSA-IAtimesAR
AnAohmmeterAshouldAneverAbeAconnectedAto;A-ACORRECTAANSWERSA-
aAliveAcircuitAorAaAchargedAcapacitorAuntilAitAhasAbeenAdischarged
WhichAofAtheAfollowingAwouldAbeAconsideredAanAinductiveAload?A-
ACORRECTAANSWERSA-electricAmotor

TheAvoltageAtoAgroundAofAaA"highALeg"AorA"StingerALeg"AonAaAthreeAphaseAopenADeltaAsyst
emAwillAbeAapproximately;A-ACORRECTAANSWERSA-208
AAtransformerAhasA1000AturnsAofAwireAinAtheAprimaryAcoilAandA500AturnsAinAtheAsecondaryA
coil.AIfA120AvoltsAareAapplied,AtheAoutputAvoltageAwillAbe.A-ACORRECTAANSWERSA-
60Avolts
AAtransformerAhasA1000AturnsAofAwireAinAtheAprimaryAcoilAandA2000AturnsAinAtheAsecondary
Acoil.AIfA120AvoltsAareAapplied,AtheAoutputAvoltageAwillAbe;A-ACORRECTAANSWERSA-

240Avolts
WhichAofAtheAfollowingAisAtheAsymbolAforAImpedanceAinAanAACAcircuit?A-
ACORRECTAANSWERSA-Z

WhenAcurrentAflowsAinAaAtwoAwireAcircuitA(suchAasA120Avolts)AifAaAclampAonAampAmeterAisAcl
ampedAaroundAbothAwires.AWhatAmeasurementAwouldAyouAexpect?A-
ACORRECTAANSWERSA-ZeroAampsAdueAtoAcancelationAofAtheAtwoAfields.

IfAtheAconductorAinAanAAÇAcircuitAisAwoundAintoAaAcoil,AtheAresultingAEMFAopposesAtheAsup
plyAvoltage.AThisAoppositionAisAcalled.A-ACORRECTAANSWERSA-inductiveAreactance.
AAdiodeAisAusedAto;A-ACORRECTAANSWERSA-controlAtheAdirectionAofAelectronAflow.