PRACTICE TEST NERC QUESTIONS
WITH CORRECT ANSWERS
A stransmission sline sis soperating swith sa svoltage sphase sangle sdifferent sof s30 sdegrees
sbetween sthe ssending sVs sand sthe sreceiving sbus sVr. sIf sthe sreceiving send sload sis
ssuddenly sincreased, sthe svoltage sphase sangle sdifference swill sbe? s- sans--The sphase
sangle swill sincrease. sWhen sload sis sincreased sphase sangle swill sincrease.
A sload shas sa spower sfactor sof s0.9 slagging. sIf sthe sload sdraws s100 sMVA, swhat sis sthe
sMW sdraw? s- sans--90 spf= smw/mva
The shigh sside sof sa sdelta-wye sconnection stransformer sis sconnected sto sa spower ssystem
swith s199 skV sL-G shigh sside svoltage. sWhat sis sthe svoltage sacross sthe sdelta swinding sof
sthe stransformer? s- sans--Vl-l= ssquare sroot sof s3 stimes sVl-g s1.73x191= s345kV
If sa stransmission sline sis scarrying s400 sMW sand s300 sMVAR swhat sis sthe sMVA? s- sans--3-
4-5 striangle s500 sMVA
The sprime smover sis sthe scomponent sof sthe sgenerator sthat screates sthe srotational sforce.
sIn sa stypical scoal sfired ssteam sgenerator swhat scomponent sspins sthe srotor? s- sans--
Turbine
Reactive sreserve sresponse sduring sa sdisturbance sis sbest sobtained sfrom swhich sdevise?
s- sans--Synchronous scondensers
For stwo sidentically sconstructed stransmission slines swhere sLine sA sis s150 smiles slong sand
sline sB sis s15 smiles slong, sif sboth slines sare slightly sloaded? s- sans--A sproduces smore
sreactive spower sthan sB.
Lightly sloaded stransmission slines sessentially sbehave slike? s- sans--Shunt sCapacitors
You sreceive san salarm sthat sindicates slow soil spressure son san sunderground stransmission
scable. sSCADA sshows sthe spressure sis scontinuing sto sdrop. sWhat sis sthe sfirst sstep syou
stake sto sprotect sthe sline? s- sans--Isolate sthe sline
Computer ssimulations sshow sthat sfor sa s100 sMW sschedule sfrom sBus sA sto sBus sB, s63%
sof sthe sschedule swill sflow son sthe sscheduled spath sand sthe sremainder swill sflow son sother
sparallel spaths. sWhat sis sthe sdistribution sfactor sfor sthe sscheduled spath? s- sans--63%
Which sstatement sbest sdescribes show sreactive spower sMVAR spower snormally sflows? s-
sans--High sVoltage sto sLow sVoltage
,Which sof sthe sfollowing stypes sof sdata sare sBA sand sRC snot srequired sto sshare swith sone
sanother? s- sans--Generator sstart sup scost
TOP smust sdevelop, smaintain, sand simplement sformal spolicies sand sprocedures sto
sprovide sfor stransmission sreliability. sWhich sof sthe sfollowing sDOES sNOT sneed sto sbe
saddressed sin sthese spolicies sand sprocedures? s- sans--Planned soutages sof sgeneration
sunits
A s1000 sMVA srated sgenerator sthat sproduces s800 sMW sand s100 sMVAR sis sbest
sdescribed sas? s- sans--Operating sin sa slagging smode. sInductive ssystem
Which sof sthe sfollowing stypes sof sMW sload sis sthe smost simpacted sby san sintentional
sfrequency sreduction? s- sans--Motor
Assume sthere sare stwo s250 smile slong stransmission slines sexporting san sexcessive
samount sof sMW sfrom sa sgeneration sarea sto sa sload sarea. sOne sof sthe slines ssuddenly
strips sand sthe sarea spower ssystem scollapses swithin sa sfew sseconds. sThe smost slikely
scause sof sthe scollapse? s- sans--Angle sInstability
The sphase svoltage sin sa swye-connected sload sis s277 sV. sWhat sis sthe sline sto sline
svoltage? s- sans--480 sV
A ssimple spower ssystem sis scomposed sof sthree slines sconnecting sgeneration sto sload.
sEach slines sthe ssame simpedance, sis sinitially sloaded sat s200 sMW, sand shas sa sthermal
slimit sof s400 sMW. sIf sone sline strips, swhat sthe sloading son sthe sshortest sremaining sline sbe
sand swill sthe sthermal slimit seither sremaining sline sbe sviolated? s- sans--300 sMW sand sNo
The sbest sprediction sof ssystem sload sis sthe sload sforecast stool sthat suses? s- sans--
Forecasted sWeather
If sthe sphase sangel sat san sopen sbreaker sis sequal sto s1/10 sof sa scycle, sthis sis sthe sthe
ssame sangle sas? s- sans--1/10 sof s360 sso s36
A s___________ stool sis sused sto sensure sthe spower ssystem scan srespond swithin
sacceptable slimits sof sN-1 s- sans--Contingency sAnalysis
Which sof sthe sfollowing sactivities swould snot sbe sincluded sin sthe sprocedures sfor
stransmission sreliability? s- sans--Ancillary sservice spricing
The stransmission sOperator sand sBA sshall sprovide sdocumentation sthat soperating
spersonnel shave s______ sto simplement sreal stime sactions sto sensure sthe sstable sand
sreliable soperation sof sthe sBES. s- sans--Proper sNERC sCertification sCredential
A sutility sdistribution sbus shas sthe sfollowing scustomer sloads sattached. sWhat sis sthe stotal
scustomer sMW sload sand sis sthe stotal scustomer sload scapacitive sor sinductive? s5 sMW s1
, sMVAR s& s3 sMW s1 sMVAR s& s2 sMW s-2 sMVAR s& s10 sMW s3 sMVAR s- sans--20 smw sand
sInductive
How smany sMVARs sdoes sa s230 skV, s50 sMVAR scapacitor sbank sprovide swhen sthe
svoltage sid s207 skV s- sans--Actual sMW/ sRated sMW s^2 sx sCapacitor sRating
40
You sare sa ssystem soperator sand sthe sload sforecast sis sfor san sall stime ssummer speak sload
sday, sgenerations sand sreactive sresources swill sbe stight. sWhich sscheduled sjob swould
syou sallow sto sproceed? s- sans--735 skV sshunt sreactor smaintenance.
A scontingency sresults sin sthe sexceedance sof san sIROL. sWhat scould sbe sthe sresult sif sthe
sIROL sis sallowed sto sbe sexceeded slonger sthan sT ssub sv s- sans--Interruption sof spower sto
sa slarge spart sof sthe sBES
Generators shave sthe sability sto sbe sused sas svoltage scontrol sdevices. sIf sa sgenerator
sraises sits sVAR soutput, sthe ssystem sorator sshould sexpect ssystem sstage sto? s- sans--
Increase
The sactual svoltage sis s362kV son sa s345 sbus. sWhat sis sthe sp.u. svoltage? s- sans--1.05
In sthe sinitial sstages sof sa ssystem srestoration scondition shigh stransmission ssystem
svoltage sproblems sare smore slikely sthan slow stransmission ssystem svoltage sproblems
swhy? s- sans--Because sof sexcessive sMVAR ssupply sfrom sthe senergization sof
stransmission slines
All stransmission soperators sshall soperate sso sthat sinstability suncontrolled sseparation sor
scascading soutages swill snot soccur sin sresult sof? s- sans--Most ssevere ssingle scontingency
sMSSC
A s230kV stransmission sline sis senergized sat s230kV sand sis s100 smiles slong. sWhat sis sthe
sapproximate sline scharging scontribution? s- sans--30MVAR
When sthe ssystem sis son sthe sverge sof sa svoltage scollapse sand snothing selse scan sbe
sdone sto salleviate sthe sproblem, soperating spersonnel sshould? s- sans--Shed sLoad
The stransmission soperator sshall stake scorrective sactions snecessary sto sprevent svoltage
scollapse swhen sreactive sresources sare sinsufficient sincluding? s- sans--Shedding sLoad
There sis sa sSPS/RAS ssystem sout sof sservice sfor smaintenance sin syour sBA. sWhat sactions
sdo syou stake? s- sans--Operate swithin ssystem slimits sthat sthe sSPS/RAS sis sdesigned sto
sprotect sagainst
If sa sBA shas s500 sMW sof sspinning sReserves sand sof sthat s300 sMW sare sRegulating
sReserves sby sdefinition sNERC srequires sthe sRegulating sReserves smust sbe? s- sans--On
sline sand sAGC sresponsive
WITH CORRECT ANSWERS
A stransmission sline sis soperating swith sa svoltage sphase sangle sdifferent sof s30 sdegrees
sbetween sthe ssending sVs sand sthe sreceiving sbus sVr. sIf sthe sreceiving send sload sis
ssuddenly sincreased, sthe svoltage sphase sangle sdifference swill sbe? s- sans--The sphase
sangle swill sincrease. sWhen sload sis sincreased sphase sangle swill sincrease.
A sload shas sa spower sfactor sof s0.9 slagging. sIf sthe sload sdraws s100 sMVA, swhat sis sthe
sMW sdraw? s- sans--90 spf= smw/mva
The shigh sside sof sa sdelta-wye sconnection stransformer sis sconnected sto sa spower ssystem
swith s199 skV sL-G shigh sside svoltage. sWhat sis sthe svoltage sacross sthe sdelta swinding sof
sthe stransformer? s- sans--Vl-l= ssquare sroot sof s3 stimes sVl-g s1.73x191= s345kV
If sa stransmission sline sis scarrying s400 sMW sand s300 sMVAR swhat sis sthe sMVA? s- sans--3-
4-5 striangle s500 sMVA
The sprime smover sis sthe scomponent sof sthe sgenerator sthat screates sthe srotational sforce.
sIn sa stypical scoal sfired ssteam sgenerator swhat scomponent sspins sthe srotor? s- sans--
Turbine
Reactive sreserve sresponse sduring sa sdisturbance sis sbest sobtained sfrom swhich sdevise?
s- sans--Synchronous scondensers
For stwo sidentically sconstructed stransmission slines swhere sLine sA sis s150 smiles slong sand
sline sB sis s15 smiles slong, sif sboth slines sare slightly sloaded? s- sans--A sproduces smore
sreactive spower sthan sB.
Lightly sloaded stransmission slines sessentially sbehave slike? s- sans--Shunt sCapacitors
You sreceive san salarm sthat sindicates slow soil spressure son san sunderground stransmission
scable. sSCADA sshows sthe spressure sis scontinuing sto sdrop. sWhat sis sthe sfirst sstep syou
stake sto sprotect sthe sline? s- sans--Isolate sthe sline
Computer ssimulations sshow sthat sfor sa s100 sMW sschedule sfrom sBus sA sto sBus sB, s63%
sof sthe sschedule swill sflow son sthe sscheduled spath sand sthe sremainder swill sflow son sother
sparallel spaths. sWhat sis sthe sdistribution sfactor sfor sthe sscheduled spath? s- sans--63%
Which sstatement sbest sdescribes show sreactive spower sMVAR spower snormally sflows? s-
sans--High sVoltage sto sLow sVoltage
,Which sof sthe sfollowing stypes sof sdata sare sBA sand sRC snot srequired sto sshare swith sone
sanother? s- sans--Generator sstart sup scost
TOP smust sdevelop, smaintain, sand simplement sformal spolicies sand sprocedures sto
sprovide sfor stransmission sreliability. sWhich sof sthe sfollowing sDOES sNOT sneed sto sbe
saddressed sin sthese spolicies sand sprocedures? s- sans--Planned soutages sof sgeneration
sunits
A s1000 sMVA srated sgenerator sthat sproduces s800 sMW sand s100 sMVAR sis sbest
sdescribed sas? s- sans--Operating sin sa slagging smode. sInductive ssystem
Which sof sthe sfollowing stypes sof sMW sload sis sthe smost simpacted sby san sintentional
sfrequency sreduction? s- sans--Motor
Assume sthere sare stwo s250 smile slong stransmission slines sexporting san sexcessive
samount sof sMW sfrom sa sgeneration sarea sto sa sload sarea. sOne sof sthe slines ssuddenly
strips sand sthe sarea spower ssystem scollapses swithin sa sfew sseconds. sThe smost slikely
scause sof sthe scollapse? s- sans--Angle sInstability
The sphase svoltage sin sa swye-connected sload sis s277 sV. sWhat sis sthe sline sto sline
svoltage? s- sans--480 sV
A ssimple spower ssystem sis scomposed sof sthree slines sconnecting sgeneration sto sload.
sEach slines sthe ssame simpedance, sis sinitially sloaded sat s200 sMW, sand shas sa sthermal
slimit sof s400 sMW. sIf sone sline strips, swhat sthe sloading son sthe sshortest sremaining sline sbe
sand swill sthe sthermal slimit seither sremaining sline sbe sviolated? s- sans--300 sMW sand sNo
The sbest sprediction sof ssystem sload sis sthe sload sforecast stool sthat suses? s- sans--
Forecasted sWeather
If sthe sphase sangel sat san sopen sbreaker sis sequal sto s1/10 sof sa scycle, sthis sis sthe sthe
ssame sangle sas? s- sans--1/10 sof s360 sso s36
A s___________ stool sis sused sto sensure sthe spower ssystem scan srespond swithin
sacceptable slimits sof sN-1 s- sans--Contingency sAnalysis
Which sof sthe sfollowing sactivities swould snot sbe sincluded sin sthe sprocedures sfor
stransmission sreliability? s- sans--Ancillary sservice spricing
The stransmission sOperator sand sBA sshall sprovide sdocumentation sthat soperating
spersonnel shave s______ sto simplement sreal stime sactions sto sensure sthe sstable sand
sreliable soperation sof sthe sBES. s- sans--Proper sNERC sCertification sCredential
A sutility sdistribution sbus shas sthe sfollowing scustomer sloads sattached. sWhat sis sthe stotal
scustomer sMW sload sand sis sthe stotal scustomer sload scapacitive sor sinductive? s5 sMW s1
, sMVAR s& s3 sMW s1 sMVAR s& s2 sMW s-2 sMVAR s& s10 sMW s3 sMVAR s- sans--20 smw sand
sInductive
How smany sMVARs sdoes sa s230 skV, s50 sMVAR scapacitor sbank sprovide swhen sthe
svoltage sid s207 skV s- sans--Actual sMW/ sRated sMW s^2 sx sCapacitor sRating
40
You sare sa ssystem soperator sand sthe sload sforecast sis sfor san sall stime ssummer speak sload
sday, sgenerations sand sreactive sresources swill sbe stight. sWhich sscheduled sjob swould
syou sallow sto sproceed? s- sans--735 skV sshunt sreactor smaintenance.
A scontingency sresults sin sthe sexceedance sof san sIROL. sWhat scould sbe sthe sresult sif sthe
sIROL sis sallowed sto sbe sexceeded slonger sthan sT ssub sv s- sans--Interruption sof spower sto
sa slarge spart sof sthe sBES
Generators shave sthe sability sto sbe sused sas svoltage scontrol sdevices. sIf sa sgenerator
sraises sits sVAR soutput, sthe ssystem sorator sshould sexpect ssystem sstage sto? s- sans--
Increase
The sactual svoltage sis s362kV son sa s345 sbus. sWhat sis sthe sp.u. svoltage? s- sans--1.05
In sthe sinitial sstages sof sa ssystem srestoration scondition shigh stransmission ssystem
svoltage sproblems sare smore slikely sthan slow stransmission ssystem svoltage sproblems
swhy? s- sans--Because sof sexcessive sMVAR ssupply sfrom sthe senergization sof
stransmission slines
All stransmission soperators sshall soperate sso sthat sinstability suncontrolled sseparation sor
scascading soutages swill snot soccur sin sresult sof? s- sans--Most ssevere ssingle scontingency
sMSSC
A s230kV stransmission sline sis senergized sat s230kV sand sis s100 smiles slong. sWhat sis sthe
sapproximate sline scharging scontribution? s- sans--30MVAR
When sthe ssystem sis son sthe sverge sof sa svoltage scollapse sand snothing selse scan sbe
sdone sto salleviate sthe sproblem, soperating spersonnel sshould? s- sans--Shed sLoad
The stransmission soperator sshall stake scorrective sactions snecessary sto sprevent svoltage
scollapse swhen sreactive sresources sare sinsufficient sincluding? s- sans--Shedding sLoad
There sis sa sSPS/RAS ssystem sout sof sservice sfor smaintenance sin syour sBA. sWhat sactions
sdo syou stake? s- sans--Operate swithin ssystem slimits sthat sthe sSPS/RAS sis sdesigned sto
sprotect sagainst
If sa sBA shas s500 sMW sof sspinning sReserves sand sof sthat s300 sMW sare sRegulating
sReserves sby sdefinition sNERC srequires sthe sRegulating sReserves smust sbe? s- sans--On
sline sand sAGC sresponsive
