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Electrician Licensing Exam Preparation | Exam
Focused MCQs (2026)
Question 1. Which formula correctly represents Ohm’s Law? A) P = V × I B) V = I × R C) I = V ÷ P D) R = P ÷ I Answer: B Explanation: Ohm’s Law states that voltage (V) equals current (I) multiplied by resistance (R). Question 2. In the NEC, the term “accessible” means: A) Able to be removed without tools B) Capable of being reached without damaging the building structure C) Located within 6 ft of the floor D) Protected by a lockable cover Answer: B Explanation: “Accessible” means equipment can be reached without removing building parts or damaging the structure. Question 3. A one‑line diagram primarily shows: A) Detailed wiring colors B) Physical layout of conduit runs C) The electrical connections between major equipment D) The exact location of each receptacle Answer: C
Electrician Licensing Exam Preparation | Exam
Focused MCQs (2026)
Explanation: One‑line diagrams simplify the power flow showing connections between major components. Question 4. To convert a 240 VA load to amperes at 120 V, you would use: A) I = V ÷ P B) I = P ÷ V C) I = √(P × V) D) I = P × V Answer: B Explanation: Current I = Power P divided by voltage V; 240 VA ÷ 120 V = 2 A. Question 5. According to NEC Table 250.66, the minimum size of a grounding electrode conductor for a 100 A service is: A) #10 AWG copper B) #8 AWG copper C) #6 AWG copper D) #4 AWG copper Answer: B Explanation: Table 250.66 lists #8 AWG copper as the minimum for a 100 A service. Question 6. The “Six‑Switch Rule” for service disconnects states that the number of disconnecting means shall not exceed: A) Six per building B) Six per 100 A of service C) Six per feeder
Electrician Licensing Exam Preparation | Exam
Focused MCQs (2026)
B) 2 %
C) 3 %
D) 5 %
Answer: C Explanation: NEC recommends a maximum of 3 % voltage drop for branch circuits. Question 10. EMT (Electrical Metallic Tubing) must be supported at intervals not exceeding: A) 3 ft B) 6 ft C) 10 ft D) 12 ft Answer: B Explanation: EMT is required to be supported within 6 ft of each outlet box and at intervals not exceeding 10 ft, but the maximum spacing between supports is 6 ft for horizontal runs. Question 11. The fill capacity of a 2‑in. × 2 ‑in. square metal box for #12 AWG conductors (each 2.25 cu in.) is: A) 14 cu in. B) 21 cu in. C) 28 cu in. D) 35 cu in. Answer: B Explanation: A 2‑in. × 2 ‑in. square box has a volume of 21 cu in., which is the allowable fill for #12 AWG conductors.
Electrician Licensing Exam Preparation | Exam
Focused MCQs (2026)
Question 12. In a three‑wire cable, the grounded (neutral) conductor is identified by: A) Black insulation B) White insulation C) Red insulation D) Green insulation Answer: B Explanation: NEC designates white (or gray) insulation for the grounded (neutral) conductor. Question 13. Which cable type is permitted for concealed work in dry locations without a raceway? A) NM‑B (Romex) B) MC cable with metal armor C) AC cable with steel armor D) UF cable Answer: A Explanation: NM‑B is approved for concealed dry‑location wiring without a raceway. Question 14. An aluminum‑wiring receptacle must be marked “ALR” or “CO” to indicate: A) It is corrosion‑resistant B) It is compatible with aluminum conductors C) It is approved for outdoor use D) It has a built‑in GFCI Answer: B
Electrician Licensing Exam Preparation | Exam
Focused MCQs (2026)
D) 40 A
Answer: B Explanation: 4500 W ÷ 240 V = 18.75 A; the next standard breaker size is 20 A. Question 18. For a separately derived system, the grounding electrode conductor must be connected to the grounded conductor at: A) The service equipment only B) The source of the separately derived system only C) Both the source and the building grounding electrode system D) No connection is required Answer: C Explanation: NEC requires the GEC to be bonded at both the source of the separately derived system and the building grounding electrode system. Question 19. The minimum size of a motor‑protected overload device for a 5 hp, 230 V, 3 ‑phase motor (full‑load current 13 A) is: A) 10 A B) 13 A C) 15 A D) 20 A Answer: C Explanation: Overload devices must be set at 115 % of the motor’s full‑load current: 13 A × 1. ≈ 15 A. Question 20. A portable generator supplying a building must be connected through a:
Electrician Licensing Exam Preparation | Exam
Focused MCQs (2026)
A) Direct hard‑wired connection B) Transfer switch C) Manual circuit breaker only D) Unprotected receptacle Answer: B Explanation: NEC requires a transfer switch to safely interlock a portable generator with the building’s service. Question 21. Class I, Division 2 hazardous locations require wiring methods that are: A) Explosion‑proof only B) Intrinsically safe only C) Both explosion‑proof and intrinsically safe D) Neither; standard wiring is permitted Answer: B Explanation: Division 2 areas allow intrinsically safe wiring, which limits energy to prevent ignition. Question 22. In a health‑care facility, patient‑care areas must use which grounding method for isolation? A) Isolated grounding electrode system (IGES) B) Standard grounding electrode system (GES) C) No grounding required D) Grounding through the neutral only Answer: A Explanation: NEC requires an IGES for patient‑care areas to reduce electrical noise.
Electrician Licensing Exam Preparation | Exam
Focused MCQs (2026)
Answer: C Explanation: Using NEC Table 310.15(B)(16) for 48 V and 5 kW (≈104 A), #8 AWG copper is required for 75 °C rating. Question 26. The ampacity of a conductor must be corrected for ambient temperature using: A) Table 310.15(B)(2)(a) B) Table 310. C) Table 310. D) Table 310.15(B)(3)(a) Answer: A Explanation: Table 310.15(B)(2)(a) provides temperature correction factors for conductors. Question 27. For a 4‑wire feeder supplying a 120/240 V circuit, the neutral conductor must be: A) Same size as the ungrounded conductors B) One size smaller than the ungrounded conductors C) At least #12 AWG regardless of load D) Not required if a ground fault occurs Answer: A Explanation: NEC requires the neutral to be the same ampacity as the ungrounded conductors for 4‑wire feeders. Question 28. A conduit system that is exposed to corrosion must be made of: A) Rigid metal conduit (RMC) only
Electrician Licensing Exam Preparation | Exam
Focused MCQs (2026)
B) PVC conduit only C) EMT with corrosion‑resistant coating D) Any conduit, provided it is painted Answer: B Explanation: PVC conduit is non‑metallic and resists corrosion, suitable for corrosive environments. Question 29. The minimum clearance between a grounded metal conduit and a live conductor in a raceway is: A) 1 in. B) 2 in. C) 3 in. D) No clearance required if both are insulated Answer: D Explanation: When both conductors are insulated, no specific clearance is mandated. Question 30. In a commercial building, AFCI protection is required for which of the following? A) All 120 V branch circuits in bedrooms only B) All 120 V circuits supplying lighting loads C) All 240 V circuits in the kitchen D) Only dedicated appliance circuits Answer: B Explanation: NEC 2020 requires AFCI protection for 120 V circuits that supply lighting loads in commercial occupancies.
Electrician Licensing Exam Preparation | Exam
Focused MCQs (2026)
Answer: B Explanation: NEC allows up to 6 current‑carrying conductors in a raceway before applying derating factors. Question 34. When installing a receptacle box in a concrete wall, the box must be: A) Surface‑mounted only B) Embedded at least 1 in. deep C) Secured with concrete anchors rated for the box size D) No special requirements Answer: C Explanation: Concrete anchors must be used and rated for the box and load. Question 35. The minimum height for a light switch in a residential dwelling is: A) 42 in. above the floor B) 48 in. above the floor C) 54 in. above the floor D) No specific height required Answer: D Explanation: NEC does not prescribe a minimum mounting height for switches. Question 36. For a 3‑phase, 4‑wire feeder supplying a 120/208 V system, the neutral must be: A) Connected to the ground at the service only B) Isolated from ground throughout the system
Electrician Licensing Exam Preparation | Exam
Focused MCQs (2026)
C) Bonded to ground at each panel D) Not required if a GFCI is used Answer: A Explanation: The neutral is bonded to ground only at the service entrance. Question 37. A conduit fill of 40 % is considered: A) Overfilled B) Underfilled C) Acceptable for all conduit sizes D) Acceptable only for conduit larger than 2 in. Answer: B Explanation: NEC permits up to 40 % fill for more than 2 conductors; 40 % is the maximum, not underfilled. Question 38. The required spacing between supports for PVC conduit is: A) 3 ft B) 6 ft C) 8 ft D) 10 ft Answer: D Explanation: PVC conduit must be supported at intervals not exceeding 10 ft. Question 39. A receptacle installed in a laundry room must be GFCI protected because: A) It is within 6 ft of a sink
Electrician Licensing Exam Preparation | Exam
Focused MCQs (2026)
Question 42. The NEC definition of “qualified person” includes: A) Anyone who can read the code B) Anyone who has completed an apprenticeship C) Anyone who has the knowledge, skill, and training to perform the work safely D) Only licensed electricians Answer: C Explanation: A qualified person is defined by the ability to perform the work safely, not necessarily licensure. Question 43. A motor‑controlled circuit must have a disconnecting means located: A) Within 10 ft of the motor B) Within sight of the motor C) At the service panel only D) No disconnect required if the motor is under 1 hp Answer: B Explanation: NEC requires the disconnect to be within sight (visible and not more than 50 ft away). Question 44. For a 120 V, 15 A receptacle, the minimum size of the grounding conductor is: A) #14 AWG copper B) #12 AWG copper C) #10 AWG copper D) #8 AWG copper Answer: B
Electrician Licensing Exam Preparation | Exam
Focused MCQs (2026)
Explanation: NEC Table 250.122 requires a #12 AWG grounding conductor for circuits up to 20 A. Question 45. Which of the following is a permitted method for supporting NM‑B cable in a residential attic? A) Staples placed every 4 in. B) Cable trays only C) Staples or straps placed within 8 in. of each box and at intervals not exceeding 4 ft D) No support required if the cable is less than 6 ft long Answer: C Explanation: NM‑B must be secured within 8 in. of a box and at intervals not exceeding 4 ft. Question 46. The minimum clearance between a service panel and a combustible wall is: A) 12 in. B) 18 in. C) 24 in. D) No clearance required if the panel is listed for the wall type Answer: B Explanation: NEC 2020 requires a minimum of 18 in. clearance in front of service equipment. Question 47. A circuit supplying a bathroom vanity light must be protected by a: A) GFCI only B) AFCI only C) Both GFCI and AFCI D) No special protection required
Electrician Licensing Exam Preparation | Exam
Focused MCQs (2026)
C) Fixed electric water heater D) Portable electric heater Answer: D Explanation: Portable electric heaters are not required to have a dedicated disconnect. Question 51. When a feeder is installed in a building with a high‑rise fire‑rated wall, the conduit must be: A) Rigid metal conduit only B) Listed for fire resistance and installed in accordance with fire‑rating requirements C) PVC conduit with a fire‑resistant coating D) No special requirement if the wall is rated 2 hr Answer: B Explanation: NEC requires conduit in fire‑rated assemblies to be listed for fire resistance. Question 52. A 3‑wire, 120/240 V circuit feeding a dryer must have a neutral conductor that is: A) Insulated with a white or gray outer covering B) Bare copper only C) Identical in size to the ground wire D) Not required if the dryer is 30 A rated Answer: A Explanation: The neutral must be identified with white or gray insulation. Question 53. The minimum size of a grounding electrode conductor for a 400 A service using aluminum is:
Electrician Licensing Exam Preparation | Exam
Focused MCQs (2026)
A) #4 AWG
B) #2 AWG
C) #1/0 AWG
D) #4/0 AWG
Answer: C Explanation: Table 250.66 indicates #1/0 AWG aluminum for a 400 A service. Question 54. A 15‑A GFCI receptacle installed in a garage must be labeled “GFCI Protected” when: A) It provides downstream protection to other receptacles B) It is the only receptacle on the circuit C) It is a test‑only device D) No label is required if it is a GFCI type Answer: A Explanation: NEC requires labeling for receptacles protected downstream by a GFCI. Question 55. When calculating voltage drop, which of the following factors is NOT used? A) Conductor resistance per unit length B) Length of the run C) Power factor of the load D) Ambient temperature Answer: D Explanation: Voltage‑drop calculations use resistance, length, and load current (including power factor for AC), but ambient temperature is accounted for in ampacity, not voltage drop directly.
