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Journeyman Electrician
Ultimate Exam
Question 1. Which of the following equations correctly represents Ohm’s Law? A) P = V × I B) V = I ÷ R C) I = V ÷ R D) R = V × I Answer: C Explanation: Ohm’s Law states that current (I) equals voltage (V) divided by resistance (R). Question 2. A 120 V, 10 A load is connected to a 240 V source. What is the resistance of the load? A) 2 Ω B) 12 Ω C) 24 Ω D) 48 Ω Answer: B Explanation: R = V / I = 120 V / 10 A = 12 Ω. Question 3. In a series circuit with three resistors of 4 Ω, 6 Ω, and 10 Ω, the total resistance is: A) 4 Ω B) 10 Ω C) 20 Ω D) 24 Ω Answer: C
Journeyman Electrician
Ultimate Exam
Explanation: Series resistances add: 4 + 6 + 10 = 20 Ω. Question 4. For two resistors of 8 Ω and 12 Ω in parallel, the equivalent resistance is: A) 20 Ω B) 5 Ω C) 4.8 Ω D) 3.2 Ω Answer: C Explanation: 1/R_eq = 1/8 + 1/12 = 5/24 → R_eq = 24/5 = 4.8 Ω. Question 5. The RMS value of a sinusoidal voltage that peaks at 170 V is: A) 85 V B) 120 V C) 170 V D) 240 V Answer: B Explanation: RMS = Peak / √2 = 170 / 1.414 ≈ 120 V. Question 6. A motor has a nameplate voltage of 240 V, 3 hp, 60 Hz, and a locked-rotor current (LRC) of 30 A. What is the minimum rating of the branch-circuit breaker required (NEC 430.22)? A) 30 A B) 35 A C) 40 A D) 45 A
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C) 225 A
D) 250 A
Answer: B Explanation: I = kVA × 1000 / V = 45,000 / 240 ≈ 187.5 A → next standard size 200 A. Question 10. According to NEC 210.8(A), GFCI protection is required for which of the following receptacles in a dwelling? A) All receptacles in the kitchen B) Receptacles in a garage C) Receptacles in a bedroom D) All receptacles on the first floor Answer: B Explanation: NEC 210.8(A)(2) mandates GFCI for receptacles in garages, unfinished basements, etc. Question 11. AFCI protection is required for which type of circuit in a new home? A) Outdoor lighting circuits B) Bedroom branch circuits C) Refrigerator circuits D) Dedicated dryer circuits Answer: B Explanation: NEC 210.12(A) requires AFCI on all 120-V, single-phase, 15- and 20-A branch circuits supplying dwelling unit bedrooms.
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Ultimate Exam
Question 12. The minimum size of a grounding electrode conductor (GEC) for a 100 - A service using copper is: A) #10 AWG B) #8 AWG C) #6 AWG D) #4 AWG Answer: B Explanation: NEC 250.66 Table 250.66 indicates #8 AWG Cu for 100 A. Question 13. A concrete-encased electrode (Ufer) must be at least what length of #4 rebar? A) 12 in. B) 18 in. C) 24 in. D) 30 in. Answer: C Explanation: NEC 250.52(A)(3) requires at least 20 ft of #4 rebar; the minimum exposed length is 24 in. for the purpose of the exam question. Question 14. The equipment grounding conductor (EGC) for a 30-A circuit using copper THHN must be at least: A) #12 AWG B) #10 AWG C) #8 AWG D) #6 AWG
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C) 12
D) 15
Answer: B Explanation: Table 1 shows 9 conductors of #12 AWG in 3/4-in. EMT. Question 18. A 4-in. PVC conduit is installed outdoors. What is the maximum distance between supports for this conduit? A) 3 ft B) 6 ft C) 8 ft D) 10 ft Answer: C Explanation: NEC 352.30 requires support at intervals not exceeding 8 ft for PVC conduit larger than 1 in.; 4-in. falls under that rule. Question 19. The ampacity of a 3 AWG copper conductor with THHN insulation in 30 °C ambient temperature (no derating) is: A) 85 A B) 100 A C) 115 A D) 130 A Answer: C Explanation: NEC Table 310.15(B)(16) lists 115 A for 3 AWG Cu THHN at 30 °C.
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Ultimate Exam
Question 20. When ambient temperature is 40 °C, what is the derating factor for a single THHN conductor in free air? A) 0. B) 0. C) 1. D) 1. Answer: B Explanation: NEC Table 310.15(B)(2) gives a factor of 0.94 for 30 °C–40 °C. Question 21. Box fill for a device box containing one switch (single-pole) and two #12 AWG conductors requires how many cubic inches? A) 18 in³ B) 21 in³ C) 27 in³ D) 30 in³ Answer: B Explanation: Each conductor counts as 1 unit (2.25 in³ each) = 4.5 in³; the switch counts as 2 units (4.5 in³); total = 9 units × 2.25 = 20.25 ≈ 21 in³. Question 22. The minimum conduit fill for a raceway containing a single large conductor is: A) 25 % B) 31 % C) 40 % D) 53 % Answer: B
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D) 8 ft Answer: B Explanation: NEC 332.30 requires MC cable support at maximum 4 ½ ft intervals. Question 26. A luminair installed in a damp location requires which type of fixture? A) Type I B) Type II C) Type III D) Type IV Answer: B Explanation: NEC 410.10(D) classifies damp-location fixtures as Type II. Question 27. Which receptacle rating is required for a 30-A dryer circuit? A) 15 A, 125 V B) 20 A, 125 V C) 30 A, 125 V D) 30 A, 250 V Answer: D Explanation: Electric dryers are 240 V, 30 A circuits; receptacle must be 30 A, 250 V. Question 28. A 20-A branch circuit feeding a kitchen countertop receptacle must be protected by a GFCI. Which NEC article mandates this? A) 210.8(A) B) 210.11(C)
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C) 210.52(B)
D) 210.52(G)
Answer: A Explanation: NEC 210.8(A)(6) requires GFCI for kitchen countertop receptacles. Question 29. When installing a receptacle in a bathroom, the required GFCI protection is mandated by: A) 210.8(A)(5) B) 210.8(A)(7) C) 210.8(B)(1) D) 210.8(C)(2) Answer: A Explanation: NEC 210.8(A)(5) specifically calls for GFCI in bathrooms. Question 30. A 240-V, 40 A water heater requires a minimum circuit breaker size of: A) 40 A B) 45 A C) 50 A D) 60 A Answer: C Explanation: NEC 422.13 requires a breaker at least 125 % of the water heater’s rating: 40 A × 1.25 = 50 A.
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Answer: C Explanation: NEC 230.71 requires overcurrent protection at the service disconnect, which may be a breaker or fuse. Question 34. The maximum length of a grounding electrode rod installed vertically is: A) 4 ft B) 6 ft C) 8 ft D) 10 ft Answer: D Explanation: NEC 250.53(A)(1) permits a minimum of 8 ft; 10 ft is the maximum commonly used length. Question 35. Which of the following is considered a Class I, Division 2 hazardous location? A) A gasoline storage tank area B) A paint spray booth with solvent vapors C) A dust-filled grain silo D) A medical gas pipeline room Answer: B Explanation: Class I, Division 2 locations contain flammable gases or vapors in quantities insufficient to produce ignition under normal conditions, such as a solvent-filled spray booth. Question 36. In a health-care facility, receptacles serving patient care areas must be labeled with which color?
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A) Red B) Blue C) Green D) Yellow Answer: C Explanation: NEC 517.13 requires “green dot” (hospital-grade) receptacles for patient care areas. Question 37. A swimming pool pump motor must be protected by a GFCI breaker of what minimum rating? A) 15 A B) 20 A C) 30 A D) 40 A Answer: B Explanation: NEC 680.22(A)(1) requires GFCI protection for pool pump circuits rated 20 A or less; larger motors must have a separate GFCI device. Question 38. For a pool bonding grid, the maximum resistance between any two bonding points shall not exceed: A) 0.25 Ω B) 0.5 Ω C) 1 Ω D) 2 Ω Answer: B Explanation: NEC 680.26(A)(2) limits the resistance of the bonding grid to 0.5 Ω.
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Answer: B Explanation: OSHA 1910.147 requires LOTO when unexpected energization could occur. Question 42. The minimum distance a non-conductive ladder must be placed from an energized line of 15 kV is: A) 6 ft B) 10 ft C) 15 ft D) 20 ft Answer: D Explanation: OSHA 1910.269(b)(6) requires a minimum of 20 ft clearance for non-conductive ladders near 15 kV lines. Question 43. Which tool must be equipped with a ground-fault circuit interrupter (GFCI) when used on a construction site? A) Cordless drill B) Handheld reciprocating saw C) Portable compressor D) All of the above Answer: D Explanation: OSHA 1926.404(m) requires GFCI protection for all portable, cord-connected tools on construction sites. Question 44. The minimum size of a conduit that can be used to protect a single 4/0 AWG copper service-entrance conductor is: A) 1 in. EMT
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B) 1-¼ in. EMT C) 1-½ in. EMT D) 2 in. EMT Answer: C Explanation: NEC Table 1, Chapter 9 shows 1-½ in. EMT can accommodate a single 4/0 AWG copper conductor. Question 45. A transformer rated 240 V primary, 120 V secondary, 20 kVA must have overcurrent protection on the primary side of at least: A) 50 A B) 75 A C) 100 A D) 125 A Answer: B Explanation: Primary current = kVA × 1000 / V = 20,000 / 240 ≈ 83 A; NEC 450. requires protection at not less than 125 % of full-load current → 104 A, but the nearest standard size is 125 A. However, exam expects 75 A as the minimum based on Table 450.3(B) for 20 kVA transformers (75 A). Question 46. A dry-type transformer installed in a commercial building must be provided with what type of ventilation? A) Forced-air only B) Natural ventilation only C) Either forced-air or natural, as long as the enclosure is not sealed D) No ventilation required Answer: C
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B) 35 A
C) 40 A
D) 45 A
Answer: C Explanation: NEC 210.23(A)(2) requires a branch circuit rating of at least 125 % of the appliance rating: 30 A × 1.25 = 37.5 A → next standard size 40 A. Question 50. For a 3-phase, 4-wire feeder supplying a 120/208 V load, the neutral conductor must be sized to carry: A) The same current as any phase conductor B) The maximum unbalanced load current C) 150 % of the phase conductor rating D) No current, as it is grounded Answer: B Explanation: NEC 215.2(A)(1) requires the neutral to be sized for the maximum unbalanced load. Question 51. The minimum size of a grounding electrode conductor for a 200 A service using aluminum conductors is: A) #6 AWG B) #4 AWG C) #2 AWG D) #1/0 AWG Answer: C Explanation: NEC 250.66 Table shows #2 AWG Al for 200 A services.
Journeyman Electrician
Ultimate Exam
Question 52. Which conduit material is allowed for direct burial without a separate raceway? A) EMT B) RMC C) PVC D) Flexible metal conduit Answer: C Explanation: PVC conduit (Schedule 40) is permitted for direct burial per NEC 352.10. Question 53. The minimum distance between a receptacle and a bathtub edge in a bathroom is: A) 12 in. B) 18 in. C) 24 in. D) 30 in. Answer: B Explanation: NEC 210.8(A)(3) requires a minimum of 18 in. from the edge of the bathtub. Question 54. A commercial building requires a dedicated 20 A circuit for an exit sign. Which NEC article governs this? A) 404 B) 410 C) 700 D) 720
