Electrical Test Questions and Answers: NCCER, Exams of Electrical and Electronics Engineering

Electrical test questions and answers for NCCER certification prep. Topics include voltage drop, circuit analysis, conductors, grounding, and safety. A resource for electricians/students to test knowledge of electrical principles. Covers NEC recommendations, devices, power, calculations, motors, measurement, plans, materials, systems, tape, conduit, grounding, megger, gloves, transformers, operators, lockout/tagout, diagrams, enclosures, spaces, protection, entries, insulation, reactance, supports, resistance, lighting, verification, drawings, thickness, heating cable, contacts, derating, grounding, AIC ratings, heating elements, electrodes, markings, resistors, horsepower, conduit sizes, raceway, transformer core, ampacity, reporting damage, conductors, resistance testing, total resistance, fuses, cable tray, frequency, bus isolation, overload relay, transformer coil, and enclosure types.

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2025/2026

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NCCER /
/ELECTRICAL /
/TEST /
/QUESTIONS /
/WITH //CORRECT //ANSWERS //
The /
/NEC /
/recommends /
/maintaining /
/voltage /
/within //
a /
/3% /
/drop. /
/If //
a /
/branch /
/circuit /
/operates /
/at /
/240 /
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NCCER /

/ELECTRICAL /

/TEST /

/QUESTIONS /

/WITH //CORRECT //ANSWERS //

The /

/NEC /

/recommends /

/maintaining /

/voltage /

/within //

a /

/drop. /

/If //

a /

/branch /

/circuit /

/operates /

/at /

/volts /

/AC. /

/What /

/is /

/the /

/minimum /

/circuit /

/operating //volt? //- //CORRECT //ANSWERS(S)✔✔ 232

What /

/is /

/the /

/name /

/of /

/the /

/connecting /

/device /

/shown /

/in //the //diagram? //- //CORRECT //ANSWERS(S)✔✔Split-bolt

The /

/volt /

/amperes /

/in /

/circuit /

/provides /

/volts /

/and /

/there /

/are //

5 //ohms //of //resistance, //how //much //current //is //in //the //circuit? //-

//CORRECT //ANSWERS(S)✔✔ 48 //amps

What /

/should /

/be /

/done /

/to /

/change /

/rotation /

/of //

a //

/phase /

/motor? //- /

/CORRECT //ANSWERS(S)✔✔Swap //any // 2 //T //leads

What /

/instrument /

/is /

/used /

/to /

/measure /

/current? //- //CORRECT //ANSWERS(S)✔✔Ammeter

Which /

/plan /

/indicates /

/the /

/location /

/of /

/structures /

/and /

/equipment /

/on //a //property? //- //CORRECT //ANSWERS(S)✔✔Site

Generally //, /

/the /

/most /

/ideal /

/guide /

/to /

/assist /

/cables /

/entering //

a //conduit? //- //CORRECT //ANSWERS(S)✔✔Piston

Which /

/of /

/the /

/following /

/is /

/not //

a /

/reason /

/why /

/electrical /

/systems /

/must /

/be /

/grounded? //- /

/CORRECT /

/ANSWERS(S)✔✔Limit /

/the //potential //between //ungrounded //conductors

What /

/type /

/of /

/conduit /

/body /

/is /

/characterized /

/by //

a /

/threaded /

/straight /

/hub //on //each //end? //- //CORRECT //ANSWERS(S)✔✔C

A //megger //will //be //used //to //check //an //in-

service /

/cable. /

/The /

/Electrician /

/MUST /

/be /

/sure /

/that //the //circuit //is: //- //CORRECT //ANSWERS(S)✔✔De-

energized //and //locked //tagged //out, //and //tested

/of //pushbutton //operators //typically //used //in //motor //controls //-

//CORRECT //ANSWERS(S)✔✔Open //and //closed

In /

/the /

/event /

/of /

/an /

/emergency /

/where /

/the /

/lockout/ /

/tagout /

/device /

/is /

/left /

/secured, /

/who /

/can /

/remove /

/the /

/lockout/tagout /

/device? //- /

/CORRECT //ANSWERS(S)✔✔Authorized //supervisor

A /

/drawing /

/showing //

a /

/point //

A /

/to /

/point //

B /

/hookup /

/of /

/conductors /

/is /

/called //a: //- //CORRECT //ANSWERS(S)✔✔Wiring //diagram

A /

/NEMA /

/type___ /

/enclosure /

/is /

/both /

/watertight /

/and /

/corrosion- //resistant. //- //CORRECT //ANSWERS(S)✔✔4X

/found? //- /

/CORRECT //ANSWERS(S)✔✔Panelboard //schedule

A /

/Type //"X" /

/conduit /

/body /

/has /

/how /

/many //conduit //entries //- //CORRECT //ANSWERS(S)✔✔ 4

What /

/test /

/equipment /

/can /

/be /

/used /

/to /

/test /

/the /

/condition /

/of /

/insulation /

/in /

/electrical /

/apparatus? //- //CORRECT //ANSWERS(S)✔✔Megohmmeter

The /

/opposing /

/force /

/to //

a /

/flow /

/of /

/alternating /

/current /

/is //called: //- //CORRECT //ANSWERS(S)✔✔Reactance

That /

/is //

a /

/trapeze /

/type /

/support //- /

/CORRECT /

/ANSWERS(S)✔✔Two /

/threaded //rods //supporting //a //channel //or //strut

/absence /

/of /

/voltage /

/should /

/be /

/performed /

/only /

/by: //- //CORRECT //ANSWERS(S)✔✔Qualified //individuals

What /

/is /

/shown /

/on //

a /

/sectional /

/drawing? //- /

/CORRECT //ANSWERS(S)✔✔Cutaway //view //of //a //building

A /

/conductor /

/with /

/mils /

/of /

/insulation /

/would /

/have /

/insulation /

/thickness //of: //- //CORRECT //ANSWERS(S)✔✔0.22''

The /

/recommended //method //of //attaching //self- //regulating //heating

//cables /

/to /

/pipes /

/is /

/by //using: //- //CORRECT //ANSWERS(S)✔✔Fiberglass //tape

An /

/auxiliary /

/holding /

/contact //

/seal- /

/in) /

/on //

a /

/typically /

The /

/conductors /

/used /

/to /

/connect /

/the /

/system /

/grounded /

/conductor /

/or /

/the /

/equipment /

/to //

a /

/grounding /

/electrode /

/or /

/to //

a /

/point /

/on /

/the /

/grounding: //- /

/CORRECT //ANSWERS(S)✔✔Electrode //conductor

The /

/equipment /

/grounding /

/conductor /

/is /

/used /

/to /

/interconnect /

/and /

/bond: //- /

/CORRECT /

/ANSWERS(S)✔✔Non- //current- //carrying //metal //parts

The /

/ungrounded /

/conductor /

/of //

a /

/three /

/phase /

/Delta //

/wire /

/system /