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PRACTICE TEST NERC QUESTIONS WITH COMPLETE SOLUTIONS
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PRACTICE TEST NERC QUESTIONS WITH COMPLETE SOLUTIONS
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PRACTICE TEST NERCQUESTIONS WITH
COMPLETE SOLUTIONS
AVtransmissionVlineVisVoperatingVwithVaVvoltageVphaseVangleVdifferentVofV30Vdegre
esVbetweenVtheVsendingVVsVandVtheVreceivingVbusVVr.VIfVtheVreceivingVendVloadVi
sVsuddenlyVincreased,VtheVvoltageVphaseVangleVdifferenceVwillVbe?V-
VcorrectVanswer-
TheVphaseVangleVwillVincrease.VWhenVloadVisVincreasedVphaseVangleVwillVincrease
.
AVloadVhasVaVpowerVfactorVofV0.9Vlagging.VIfVtheVloadVdrawsV100VMVA,VwhatVisVth
eVMWVdraw?V-VcorrectVanswer-90Vpf=Vmw/mva
TheVhighVsideVofVaVdelta-
wyeVconnectionVtransformerVisVconnectedVtoVaVpowerVsystemVwithV199VkVVL-
GVhighVsideVvoltage.VWhatVisVtheVvoltageVacrossVtheVdeltaVwindingVofVtheVtransfor
mer?V-VcorrectVanswer-Vl-l=VsquareVrootVofV3VtimesVVl-gV1.73x191=V345kV
IfVaVtransmissionVlineVisVcarryingV400VMWVandV300VMVARVwhatVisVtheVMVA?V-
VcorrectVanswer-3-4-5VtriangleV500VMVA
TheVprimeVmoverVisVtheVcomponentVofVtheVgeneratorVthatVcreatesVtheVrotationalVf
orce.VInVaVtypicalVcoalVfiredVsteamVgeneratorVwhatVcomponentVspinsVtheVrotor?V-
VcorrectVanswer-Turbine
,ReactiveVreserveVresponseVduringVaVdisturbanceVisVbestVobtainedVfromVwhichVdevi
se?V-VcorrectVanswer-SynchronousVcondensers
ForVtwoVidenticallyVconstructedVtransmissionVlinesVwhereVLineVAVisV150VmilesVlong
VandVlineVBVisV15VmilesVlong,VifVbothVlinesVareVlightlyVloaded?V-VcorrectVanswer-
AVproducesVmoreVreactiveVpowerVthanVB.
LightlyVloadedVtransmissionVlinesVessentiallyVbehaveVlike?V-VcorrectVanswer-
ShuntVCapacitors
YouVreceiveVanValarmVthatVindicatesVlowVoilVpressureVonVanVundergroundVtransmi
ssionVcable.VSCADAVshowsVtheVpressureVisVcontinuingVtoVdrop.VWhatVisVtheVfirstV
stepVyouVtakeVtoVprotectVtheVline?V-VcorrectVanswer-IsolateVtheVline
ComputerVsimulationsVshowVthatVforVaV100VMWVscheduleVfromVBusVAVtoVBusVB,V
63%VofVtheVscheduleVwillVflowVonVtheVscheduledVpathVandVtheVremainderVwillVflow
VonVotherVparallelVpaths.VWhatVisVtheVdistributionVfactorVforVtheVscheduledVpath?V-
VcorrectVanswer-63%
WhichVstatementVbestVdescribesVhowVreactiveVpowerVMVARVpowerVnormallyVflows
?V-VcorrectVanswer-HighVVoltageVtoVLowVVoltage
WhichVofVtheVfollowingVtypesVofVdataVareVBAVandVRCVnotVrequiredVtoVshareVwithV
oneVanother?V-VcorrectVanswer-GeneratorVstartVupVcost
TOPVmustVdevelop,Vmaintain,VandVimplementVformalVpoliciesVandVproceduresVtoVp
rovideVforVtransmissionVreliability.VWhichVofVtheVfollowingVDOESVNOTVneedVtoVbeV
addressedVinVtheseVpoliciesVandVprocedures?V-VcorrectVanswer-
PlannedVoutagesVofVgenerationVunits
AV1000VMVAVratedVgeneratorVthatVproducesV800VMWVandV100VMVARVisVbestVdes
cribedVas?V-VcorrectVanswer-OperatingVinVaVlaggingVmode.VInductiveVsystem
WhichVofVtheVfollowingVtypesVofVMWVloadVisVtheVmostVimpactedVbyVanVintentionalV
frequencyVreduction?V-VcorrectVanswer-Motor
AssumeVthereVareVtwoV250VmileVlongVtransmissionVlinesVexportingVanVexcessiveVa
mountVofVMWVfromVaVgenerationVareaVtoVaVloadVarea.VOneVofVtheVlinesVsuddenlyV
tripsVandVtheVareaVpowerVsystemVcollapsesVwithinVaVfewVseconds.VTheVmostVlikel
yVcauseVofVtheVcollapse?V-VcorrectVanswer-AngleVInstability
TheVphaseVvoltageVinVaVwye-
connectedVloadVisV277VV.VWhatVisVtheVlineVtoVlineVvoltage?V-VcorrectVanswer-
480VV
AVsimpleVpowerVsystemVisVcomposedVofVthreeVlinesVconnectingVgenerationVtoVload
.VEachVlinesVtheVsameVimpedance,VisVinitiallyVloadedVatV200VMW,VandVhasVaVther
malVlimitVofV400VMW.VIfVoneVlineVtrips,VwhatVtheVloadingVonVtheVshortestVremainin
gVlineVbeVandVwillVtheVthermalVlimitVeitherVremainingVlineVbeVviolated?V-
VcorrectVanswer-300VMWVandVNo
, TheVbestVpredictionVofVsystemVloadVisVtheVloadVforecastVtoolVthatVuses?V-
VcorrectVanswer-ForecastedVWeather
IfVtheVphaseVangelVatVanVopenVbreakerVisVequalVtoV1/10VofVaVcycle,VthisVisVtheVth
eVsameVangleVas?V-VcorrectVanswer-1/10VofV360VsoV36
AV___________VtoolVisVusedVtoVensureVtheVpowerVsystemVcanVrespondVwithinVacc
eptableVlimitsVofVN-1V-VcorrectVanswer-ContingencyVAnalysis
WhichVofVtheVfollowingVactivitiesVwouldVnotVbeVincludedVinVtheVproceduresVforVtran
smissionVreliability?V-VcorrectVanswer-AncillaryVserviceVpricing
TheVtransmissionVOperatorVandVBAVshallVprovideVdocumentationVthatVoperatingVpe
rsonnelVhaveV______VtoVimplementVrealVtimeVactionsVtoVensureVtheVstableVandVrel
iableVoperationVofVtheVBES.V-VcorrectVanswer-
ProperVNERCVCertificationVCredential
AVutilityVdistributionVbusVhasVtheVfollowingVcustomerVloadsVattached.VWhatVisVtheVt
otalVcustomerVMWVloadVandVisVtheVtotalVcustomerVloadVcapacitiveVorVinductive?
V5VMWV1VMVARV&V3VMWV1VMVARV&V2VMWV-2VMVARV&V10VMWV3VMVARV-
VcorrectVanswer-20VmwVandVInductive
HowVmanyVMVARsVdoesVaV230VkV,V50VMVARVcapacitorVbankVprovideVwhenVtheV
voltageVidV207VkVV-VcorrectVanswer-ActualVMW/VRatedVMWV^2VxVCapacitorVRating
40
YouVareVaVsystemVoperatorVandVtheVloadVforecastVisVforVanVallVtimeVsummerVpeak
VloadVday,VgenerationsVandVreactiveVresourcesVwillVbeVtight.VWhichVscheduledVjob
VwouldVyouVallowVtoVproceed?V-VcorrectVanswer-
735VkVVshuntVreactorVmaintenance.
AVcontingencyVresultsVinVtheVexceedanceVofVanVIROL.VWhatVcouldVbeVtheVresultVif
VtheVIROLVisVallowedVtoVbeVexceededVlongerVthanVTVsubVvV-VcorrectVanswer-
InterruptionVofVpowerVtoVaVlargeVpartVofVtheVBES
GeneratorsVhaveVtheVabilityVtoVbeVusedVasVvoltageVcontrolVdevices.VIfVaVgenerator
VraisesVitsVVARVoutput,VtheVsystemVoratorVshouldVexpectVsystemVstageVto?V-
VcorrectVanswer-Increase
TheVactualVvoltageVisV362kVVonVaV345Vbus.VWhatVisVtheVp.u.Vvoltage?V-
VcorrectVanswer-1.05
InVtheVinitialVstagesVofVaVsystemVrestorationVconditionVhighVtransmissionVsystemVv
oltageVproblemsVareVmoreVlikelyVthanVlowVtransmissionVsystemVvoltageVproblemsV
why?V-VcorrectVanswer-
BecauseVofVexcessiveVMVARVsupplyVfromVtheVenergizationVofVtransmissionVlines
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