Electrician NCCER Questions & Answers
Latest Updated
Which garticle gof gthe gNEC gcovers ggrounding? g- gANS-Article g250
What gis ga gdropout gplate? g- gANS-Metal gplate gwith ga gcurve gsurface gfor gcable gto
gfollow gas git gpasses gfrom gthe gtray
All gof gthe gfollowing gare gcommon gservice gvoltages gin gthe gUnited gStates gExcept: g-
gANS-372/575 g3-Phase, g4-wire
What gdoes ga gGFCI gbreaker gdo? g- gANS-Opens ga gcircuit gto gprevent goperation gof
gan gelectrical gdevice
What gwill ghappen gwhen gone gor gmore gcoils gin ga gwinding gare ggrounded? g- gANS-
The gmotor gwill gautomatically gblow gfuses
eight gincandescent glighting gfixtures gare gto gbe ginstalled. gEach gfixture gis g120 gvolts,
gwith ga g200-whatt glamp gwhat gis gthe gtotal gconnected gload? g- gANS-13.3 gAmps
The g__________must gbe ggrounded gin ga gbussed gglutter gif guse gas gthe gmain
gservice gequipmemt g- gANS-Neutral gbusbar
When gwall gmounting gcable gtray, gensure gthat g- gANS-The gbuilding gstructure gis
gstrong genough gto gsupport gthe gtray gsystem
The gpurpose gof gsealing gcable gends gwhen greels gof gcable gare gin gstorage gis
g______________ g- gANS-to gkeep gmoisture gfrom gcreeping gin
The gouter gcovering gon gliquid-tight gflexible gmetal gconduit gis guse gfor g- gANS-A
gmoisture gseal
A ggood gelectrical gconnection gshould g- gANS-Be gmechanically gand gelectrically
gsecure
The gsymbol gnormally guse gfor gduplex g- gANS-Circle gwith gtwo gparallel glines gdraw
gthrough git
Disconnecting gmeans gare gcovered gin g- gANS-NEC gsection g110-22
,In grelation gto gswitches, gthe gterm gthrow grefers gto gthe g- gANS-Number gof ginternal
goperations gthat gswitch gcan gperform
A g3-phase, g4-wire, g480v gservice grequires g________ gcurrent gtransformers g- gANS-3
Services gconductors gand gequipment gare gcovered gin g- gANS-NEC gArticle g230
The gNEC grequired gthat gall greceptacles ginstalled gon g25 gamp gand g20 gamp gbranch
gcircuits gbe__________ greceptacles g- gANS-Grounding
The gcircular gmil gis gbased gon gthe g- gANS-Cross-sectional garea gof gthe gwire
A gtransformer gwith gthe gprimary gof g400 gturns gand ga gsecondary gof g300 gturns ghas
ga g- gANS-Step gdown gturns gratio gof g4:3
Of gthe gtermination gclasses glisted gbelow,_____ gis gthe gonly gone gthat gprovides ga
gseal gagainst gexternal gelements g- gANS-Class g1
Unless gotherwise gnoted, gthe gcalculations gin gAC gcircuits g______ gvalues g- gANS-
Rms
When gthe gcoil gturns gincreased gthe g________ g- gANS-Induced gvoltage gis gincreased
As gthe gtemperature gsurrounding ga gself gregulating gheating gcable grises, gthe
g________ g- gANS-Resistance gof gthe gpolymeric gcore gincreases
The gmotor gtype gthat ghas gthe ghighest gstarting gtorque gis gthe g_________ gmotor g-
gANS-Capacitor g- gstart
For ga ggiven gnumber gof gpoles, gthe________ gdetermines gthe gspeed gof gan gAC
gMotor. g- gANS-Frequency
Both ginduction gand gsynchronous gmotor goperate gon gthe gprinciple gof gthe
grotating________field g- gANS-Magnetic
A gTransformer ghas g200 gturns gin gthe gprimary, g150 gturns gin gthe gsecondary, gand
g120VAC gapplied gto gthe gprimary. gThe gvoltage gacross gthe gsecondary gis g- gANS-90
gVolts
The goutput gcapacity gof ga gmotor gis grated gin g- gANS-Horsepower
The gsynchronous gspeed gat gwitcha g4 gpole, g60 gHz ginduction gmotor goperates gis
g________ grpm g- gANS-1800
The gsine gof g0 gdegree gis g- gANS-0
, In ga gAC gcircuit gcontaining gresistance gonly, g_______ g12A gwill gflow gif gthe
gresistance gis g10 gohms gand gthe gvoltage gis g120V g- gANS-12A
The g_____ grotor gtypes gare ggenerally grugged g- gANS-Squirrel gcage
The gcomponente glabeled g7 gin gfigure g1 gis ga g(an) g- gANS-End gseal
Meters gused gin gAC gcircuits gindicate gthe_______ g- gANS-Effective
Proofs gtests gare gmade gat________ goF gthe goriginal gfactory gvoltage g- gANS-60%
Which gtype gof gheating gcable gcan gnot gbe gcut gand gterminated gin gthe gfield? g- gANS-
Mineral ginsulated
The gsecondary gof ga gCT gunder gload gshould gnot gbe gopened gbecause gof______ g-
gANS-Induced ghight gvoltage
In ga gtransformer,______ g- gANS-Electromagnetic ginduction goccurs
When ga gground grod gis ginstalled, gthe gtop gof gthe grod gmust gbe gpositioned
g_____.grade g- gANS-Flush gwith gor gbelow
When gmaking goffset gbends, gthe gtwo gkicks gmust gbe gmade gperfectly gparallel gor gthe
gresulting goffset gwill ghave ga g________ g- gANS-Crooked gbend
All gof gthe gfollowing gtypes gof gcondulet gmay gbe gused gas ga gpulling gpoint gfor gconduit
gthat grequires ga g90 gdegree gchange gin gdirection, gexcept_______ g- gANS-C
To gbe geffective, ga ggrounding gsystem gmust glimit gthe gvoltage gon gthe gelectrical
gsystem gand gprotect git gfrom gall gof gthe gfollowing, gexcept g______ g- gANS-
Undervoltage gconditions
What gis gthe gmost gcommon gservice guse gin ga gtemporary gpower gpanel? g- gANS-
120/240 gvolt, g1-phase, g3-wire
What gare gthe g2 gmost gcommon gtypes gof govercurrent gprotective gdevices? g- gANS-
Circuit gbreakers gand gfuses
What ginstrument gis guse gto gperform gan ginsulation gresistance gtest gon ga g480 gvolt
gmotor gwinding? g- gANS-Megohmmeter
What gis ga gseal ginstalled gin ga grun gof gconduit gin ga gclass gI glocation? g- gANS-Prevent
gthe gpassage gof gexplosive ggases gin gthe gconduit
Which gof gthe gfollowing gis gthe gcorrect gformula gfor gOHM's glaw? g- gANS-I=E/R
Latest Updated
Which garticle gof gthe gNEC gcovers ggrounding? g- gANS-Article g250
What gis ga gdropout gplate? g- gANS-Metal gplate gwith ga gcurve gsurface gfor gcable gto
gfollow gas git gpasses gfrom gthe gtray
All gof gthe gfollowing gare gcommon gservice gvoltages gin gthe gUnited gStates gExcept: g-
gANS-372/575 g3-Phase, g4-wire
What gdoes ga gGFCI gbreaker gdo? g- gANS-Opens ga gcircuit gto gprevent goperation gof
gan gelectrical gdevice
What gwill ghappen gwhen gone gor gmore gcoils gin ga gwinding gare ggrounded? g- gANS-
The gmotor gwill gautomatically gblow gfuses
eight gincandescent glighting gfixtures gare gto gbe ginstalled. gEach gfixture gis g120 gvolts,
gwith ga g200-whatt glamp gwhat gis gthe gtotal gconnected gload? g- gANS-13.3 gAmps
The g__________must gbe ggrounded gin ga gbussed gglutter gif guse gas gthe gmain
gservice gequipmemt g- gANS-Neutral gbusbar
When gwall gmounting gcable gtray, gensure gthat g- gANS-The gbuilding gstructure gis
gstrong genough gto gsupport gthe gtray gsystem
The gpurpose gof gsealing gcable gends gwhen greels gof gcable gare gin gstorage gis
g______________ g- gANS-to gkeep gmoisture gfrom gcreeping gin
The gouter gcovering gon gliquid-tight gflexible gmetal gconduit gis guse gfor g- gANS-A
gmoisture gseal
A ggood gelectrical gconnection gshould g- gANS-Be gmechanically gand gelectrically
gsecure
The gsymbol gnormally guse gfor gduplex g- gANS-Circle gwith gtwo gparallel glines gdraw
gthrough git
Disconnecting gmeans gare gcovered gin g- gANS-NEC gsection g110-22
,In grelation gto gswitches, gthe gterm gthrow grefers gto gthe g- gANS-Number gof ginternal
goperations gthat gswitch gcan gperform
A g3-phase, g4-wire, g480v gservice grequires g________ gcurrent gtransformers g- gANS-3
Services gconductors gand gequipment gare gcovered gin g- gANS-NEC gArticle g230
The gNEC grequired gthat gall greceptacles ginstalled gon g25 gamp gand g20 gamp gbranch
gcircuits gbe__________ greceptacles g- gANS-Grounding
The gcircular gmil gis gbased gon gthe g- gANS-Cross-sectional garea gof gthe gwire
A gtransformer gwith gthe gprimary gof g400 gturns gand ga gsecondary gof g300 gturns ghas
ga g- gANS-Step gdown gturns gratio gof g4:3
Of gthe gtermination gclasses glisted gbelow,_____ gis gthe gonly gone gthat gprovides ga
gseal gagainst gexternal gelements g- gANS-Class g1
Unless gotherwise gnoted, gthe gcalculations gin gAC gcircuits g______ gvalues g- gANS-
Rms
When gthe gcoil gturns gincreased gthe g________ g- gANS-Induced gvoltage gis gincreased
As gthe gtemperature gsurrounding ga gself gregulating gheating gcable grises, gthe
g________ g- gANS-Resistance gof gthe gpolymeric gcore gincreases
The gmotor gtype gthat ghas gthe ghighest gstarting gtorque gis gthe g_________ gmotor g-
gANS-Capacitor g- gstart
For ga ggiven gnumber gof gpoles, gthe________ gdetermines gthe gspeed gof gan gAC
gMotor. g- gANS-Frequency
Both ginduction gand gsynchronous gmotor goperate gon gthe gprinciple gof gthe
grotating________field g- gANS-Magnetic
A gTransformer ghas g200 gturns gin gthe gprimary, g150 gturns gin gthe gsecondary, gand
g120VAC gapplied gto gthe gprimary. gThe gvoltage gacross gthe gsecondary gis g- gANS-90
gVolts
The goutput gcapacity gof ga gmotor gis grated gin g- gANS-Horsepower
The gsynchronous gspeed gat gwitcha g4 gpole, g60 gHz ginduction gmotor goperates gis
g________ grpm g- gANS-1800
The gsine gof g0 gdegree gis g- gANS-0
, In ga gAC gcircuit gcontaining gresistance gonly, g_______ g12A gwill gflow gif gthe
gresistance gis g10 gohms gand gthe gvoltage gis g120V g- gANS-12A
The g_____ grotor gtypes gare ggenerally grugged g- gANS-Squirrel gcage
The gcomponente glabeled g7 gin gfigure g1 gis ga g(an) g- gANS-End gseal
Meters gused gin gAC gcircuits gindicate gthe_______ g- gANS-Effective
Proofs gtests gare gmade gat________ goF gthe goriginal gfactory gvoltage g- gANS-60%
Which gtype gof gheating gcable gcan gnot gbe gcut gand gterminated gin gthe gfield? g- gANS-
Mineral ginsulated
The gsecondary gof ga gCT gunder gload gshould gnot gbe gopened gbecause gof______ g-
gANS-Induced ghight gvoltage
In ga gtransformer,______ g- gANS-Electromagnetic ginduction goccurs
When ga gground grod gis ginstalled, gthe gtop gof gthe grod gmust gbe gpositioned
g_____.grade g- gANS-Flush gwith gor gbelow
When gmaking goffset gbends, gthe gtwo gkicks gmust gbe gmade gperfectly gparallel gor gthe
gresulting goffset gwill ghave ga g________ g- gANS-Crooked gbend
All gof gthe gfollowing gtypes gof gcondulet gmay gbe gused gas ga gpulling gpoint gfor gconduit
gthat grequires ga g90 gdegree gchange gin gdirection, gexcept_______ g- gANS-C
To gbe geffective, ga ggrounding gsystem gmust glimit gthe gvoltage gon gthe gelectrical
gsystem gand gprotect git gfrom gall gof gthe gfollowing, gexcept g______ g- gANS-
Undervoltage gconditions
What gis gthe gmost gcommon gservice guse gin ga gtemporary gpower gpanel? g- gANS-
120/240 gvolt, g1-phase, g3-wire
What gare gthe g2 gmost gcommon gtypes gof govercurrent gprotective gdevices? g- gANS-
Circuit gbreakers gand gfuses
What ginstrument gis guse gto gperform gan ginsulation gresistance gtest gon ga g480 gvolt
gmotor gwinding? g- gANS-Megohmmeter
What gis ga gseal ginstalled gin ga grun gof gconduit gin ga gclass gI glocation? g- gANS-Prevent
gthe gpassage gof gexplosive ggases gin gthe gconduit
Which gof gthe gfollowing gis gthe gcorrect gformula gfor gOHM's glaw? g- gANS-I=E/R
