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ELECTRICIAN NCCER QUESTIONS AND ANSWERS
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ELECTRICIAN NCCER QUESTIONS AND ANSWERS
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ELECTRICIAN NCCER QUESTIONS ANDANSWERS
WhichaarticleaofatheaNECacoversagrounding?a-aans✔✔Articlea250
Whataisaaadropoutaplate?a-
aans✔✔Metalaplateawithaaacurveasurfaceaforacableatoafollowaasaitapassesafromatheatray
AllaofatheafollowingaareacommonaserviceavoltagesainatheaUnitedaStatesaExcept:a-
aans✔✔372/575a3-Phase,a4-wire
WhatadoesaaaGFCIabreakerado?a-
aans✔✔Opensaaacircuitatoapreventaoperationaofaanaelectricaladevice
Whatawillahappenawhenaoneaoramoreacoilsainaaawindingaareagrounded?a-
aans✔✔Theamotorawillaautomaticallyablowafuses
eightaincandescentalightingafixturesaareatoabeainstalled.aEachafixtureaisa120avolts,awithaaa2
00-whattalampawhataisatheatotalaconnectedaload?a-aans✔✔13.3aAmps
Thea__________mustabeagroundedainaaabussedaglutteraifauseaasatheamainaserviceaequip
memta-aans✔✔Neutralabusbar
Whenawallamountingacableatray,aensureathata-
aans✔✔Theabuildingastructureaisastrongaenoughatoasupportatheatrayasystem
Theapurposeaofasealingacableaendsawhenareelsaofacableaareainastorageaisa____________
__a-aans✔✔toakeepamoistureafromacreepingain
Theaouteracoveringaonaliquid-tightaflexibleametalaconduitaisauseafora-
aans✔✔Aamoistureaseal
Aagoodaelectricalaconnectionashoulda-aans✔✔Beamechanicallyaandaelectricallyasecure
Theasymbolanormallyauseaforaduplexa-
aans✔✔Circleawithatwoaparallelalinesadrawathroughait
Disconnectingameansaareacoveredaina-aans✔✔NECasectiona110-22
,Inarelationatoaswitches,atheatermathrowarefersatoathea-
aans✔✔Numberaofainternalaoperationsathataswitchacanaperform
Aa3-phase,a4-wire,a480vaservicearequiresa________acurrentatransformersa-aans✔✔3
Servicesaconductorsaandaequipmentaareacoveredaina-aans✔✔NECaArticlea230
TheaNECarequiredathataallareceptaclesainstalledaona25aampaanda20aampabranchacircuitsab
e__________areceptaclesa-aans✔✔Grounding
Theacircularamilaisabasedaonathea-aans✔✔Cross-sectionalaareaaofatheawire
Aatransformerawithatheaprimaryaofa400aturnsaandaaasecondaryaofa300aturnsahasaaa-
aans✔✔Stepadownaturnsaratioaofa4:3
Ofatheaterminationaclassesalistedabelow,_____aisatheaonlyaoneathataprovidesaaasealaagain
staexternalaelementsa-aans✔✔Classa1
Unlessaotherwiseanoted,atheacalculationsainaACacircuitsa______avaluesa-aans✔✔Rms
Whenatheacoilaturnsaincreasedathea________a-aans✔✔Inducedavoltageaisaincreased
Asatheatemperatureasurroundingaaaselfaregulatingaheatingacablearises,athea________a-
aans✔✔Resistanceaofatheapolymericacoreaincreases
Theamotoratypeathatahasatheahighestastartingatorqueaisathea_________amotora-
aans✔✔Capacitora-astart
Foraaagivenanumberaofapoles,athe________adeterminesatheaspeedaofaanaACaMotor.a-
aans✔✔Frequency
Bothainductionaandasynchronousamotoraoperateaonatheaprincipleaofathearotating________f
ielda-aans✔✔Magnetic
AaTransformerahasa200aturnsainatheaprimary,a150aturnsainatheasecondary,aanda120VACaa
ppliedatoatheaprimary.aTheavoltageaacrossatheasecondaryaisa-aans✔✔90aVolts
Theaoutputacapacityaofaaamotoraisaratedaina-aans✔✔Horsepower
Theasynchronousaspeedaatawitchaa4apole,a60aHzainductionamotoraoperatesaisa________ar
pma-aans✔✔1800
Theasineaofa0adegreeaisa-aans✔✔0
InaaaACacircuitacontainingaresistanceaonly,a_______a12Aawillaflowaifathearesistanceaisa10ao
hmsaandatheavoltageaisa120Va-aans✔✔12A
, Thea_____arotoratypesaareagenerallyaruggeda-aans✔✔Squirrelacage
Theacomponentealabeleda7ainafigurea1aisaaa(an)a-aans✔✔Endaseal
MetersausedainaACacircuitsaindicateathe_______a-aans✔✔Effective
Proofsatestsaareamadeaat________aoFatheaoriginalafactoryavoltagea-aans✔✔60%
Whichatypeaofaheatingacableacananotabeacutaandaterminatedainatheafield?a-
aans✔✔Mineralainsulated
TheasecondaryaofaaaCTaunderaloadashouldanotabeaopenedabecauseaof______a-
aans✔✔Inducedahightavoltage
Inaaatransformer,______a-aans✔✔Electromagneticainductionaoccurs
Whenaaagroundarodaisainstalled,atheatopaofathearodamustabeapositioneda_____.gradea-
aans✔✔Flushawithaorabelow
Whenamakingaoffsetabends,atheatwoakicksamustabeamadeaperfectlyaparallelaorathearesultin
gaoffsetawillahaveaaa________a-aans✔✔Crookedabend
Allaofatheafollowingatypesaofaconduletamayabeausedaasaaapullingapointaforaconduitathatarequ
iresaaa90adegreeachangeainadirection,aexcept_______a-aans✔✔C
Toabeaeffective,aaagroundingasystemamustalimitatheavoltageaonatheaelectricalasystemaanda
protectaitafromaallaofatheafollowing,aexcepta______a-aans✔✔Undervoltageaconditions
Whataisatheamostacommonaserviceauseainaaatemporaryapowerapanel?a-
aans✔✔120/240avolt,a1-phase,a3-wire
Whataareathea2amostacommonatypesaofaovercurrentaprotectiveadevices?a-
aans✔✔Circuitabreakersaandafuses
Whatainstrumentaisauseatoaperformaanainsulationaresistanceatestaonaaa480avoltamotorawind
ing?a-aans✔✔Megohmmeter
WhataisaaasealainstalledainaaarunaofaconduitainaaaclassaIalocation?a-
aans✔✔Preventatheapassageaofaexplosiveagasesainatheaconduit
WhichaofatheafollowingaisatheacorrectaformulaaforaOHM'salaw?a-aans✔✔I=E/R
Whichaofatheafollowingatestingainstrumentsaoperatedaonatheacurrentatransformeraprinciplea
-aans✔✔Clamp-onaammeter
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