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Journeyman Electrician Ultimate Exam
Question 1. Which equation correctly expresses Ohm’s Law? A) V = I × R B) I = V × R C) R = V ÷ I² D) P = V × I Answer: A Explanation: Ohm’s Law states that voltage (V) equals current (I) multiplied by resistance (R). Question 2. A 120 V, 15 A circuit is supplying a resistive load. What is the power consumed? A) 1,800 W B) 2,000 W C) 1,500 W D) 800 W Answer: A Explanation: Power P = V × I = 120 V × 15 A = 1,800 W. Question 3. In a series circuit, the total resistance is: A) The sum of individual resistances. B) The reciprocal of the sum of reciprocals. C) Equal to the largest resistor. D) Unchanged by adding resistors. Answer: A Explanation: Series resistances add directly: R_total = R1 + R2 + …. Question 4. For a parallel circuit with two 10 Ω resistors, the total resistance is: A) 5 Ω
Journeyman Electrician Ultimate Exam
B) 10 Ω
C) 20 Ω
D) 0 Ω
Answer: A Explanation: 1/R_total = 1/10 + 1/10 = 2/10 → R_total = 5 Ω. Question 5. The RMS value of a sinusoidal voltage is: A) Peak value divided by √2. B) Peak value multiplied by √2. C) Same as the peak value. D) Half the peak value. Answer: A Explanation: RMS = V_peak / √2 for a sine wave. Question 6. A 60 Hz AC source has a period of: A) 16.7 ms B) 60 ms C) 1 s D) 0.06 ms Answer: A Explanation: Period T = 1/f = 1/60 Hz ≈ 0.0167 s = 16.7 ms. Question 7. In a purely inductive AC circuit, the current lags the voltage by: A) 90° B) 0° C) 45° D) 180° Answer: A Explanation: Inductive reactance causes current to lag voltage by 90°.
Journeyman Electrician Ultimate Exam
A) 2.6 V
B) 5.2 V
C) 1.3 V
D) 4.0 V
Answer: A Explanation: ΔV = 2 × 12.9 mΩ·ft × 20 A × 100 ft / 6530 CM ≈ 2.6 V. Question 12. The ampacity of a 75 °C THHN conductor in a raceway is determined from: A) NEC Table 310.15(B)(16). B) NEC Table 310.12. C) Manufacturer’s rating only. D) Voltage rating only. Answer: A Explanation: Table 310.15(B)(16) provides ampacity based on temperature rating and conductor size. Question 13. Which insulation type is approved for wet locations? A) THHN only B) THWN/THHN C) XHHW-2 only D) NM-B Answer: B Explanation: THWN (Thermoplastic Heat-resistant Water-resistant Nylon) is rated for wet locations; THHN is dry. Question 14. The maximum number of 12-AWG conductors that may be placed in a 1-in. EMT conduit (using the 40 % fill rule) is: A) 9 B) 12
Journeyman Electrician Ultimate Exam
C) 15
D) 18
Answer: B Explanation: 1-in. EMT has 0.304 in² internal area; 12-AWG area = 0.0133 in². 40 % fill = 0.1216 in² → 0.1216 / 0.0133 ≈ 9.1, rounding down to 9. However NEC permits up to 12 for 12-AWG (using Table C.2). The correct answer per NEC is 12. Question 15. When installing Type AC (Armored Cable) in an accessible attic, the cable must be protected from physical damage by: A) Running it on the underside of joists. B) Using conduit the entire length. C) Supporting it every 4 ft. D) No protection required. Answer: A Explanation: In accessible attics, AC cable must be installed on the underside of joists or protected by a board to prevent damage. Question 16. The minimum burial depth for UF cable under a residential driveway is: A) 12 in. B) 24 in. C) 6 in. D) 18 in. Answer: B Explanation: UF cable must be buried at least 24 in. under driveways unless protected by concrete. Question 17. The required volume for a single gang device box containing three #12 THHN conductors, one #12 equipment grounding conductor, and a device is: A) 30 cu in. B) 45 cu in.
Journeyman Electrician Ultimate Exam
D) No bonding required if the pipe is plastic. Answer: B Explanation: Metal water piping must be bonded with a minimum #6 AWG copper conductor to the grounding electrode system. Question 21. GFCI protection is required for receptacles in which of the following locations? A) Unfinished basements. B) Garages. C) Laundry rooms. D) All of the above. Answer: D Explanation: NEC requires GFCI protection in unfinished basements, garages, and laundry rooms. Question 22. The minimum rating for a service-entrance disconnect for a 200-A residential service is: A) 150 A B) 200 A C) 250 A D) 300 A Answer: B Explanation: The disconnect must be rated at least equal to the service rating. Question 23. The required clearance in front of a service disconnect is: A) 30 in. B) 36 in. C) 42 in. D) 48 in. Answer: B
Journeyman Electrician Ultimate Exam
Explanation: NEC 230.70(A)(1) requires at least 36 in. of clear working space in front of the service disconnect. Question 24. A 20-A branch circuit supplying a bathroom receptacle must be protected by which type of breaker? A) Standard thermal-magnetic. B) GFCI-type. C) AFCI-type. D) Dual-function (GFCI/AFCI). Answer: B Explanation: Bathroom receptacles require GFCI protection. Question 25. Which of the following circuits is required to have AFCI protection in a new dwelling? A) Bedroom branch circuits. B) Kitchen countertop receptacles. C) Outdoor receptacles. D) Garage receptacles. Answer: A Explanation: NEC requires AFCI protection for all 120-V, 15- and 20-A branch circuits supplying outlets in bedrooms. Question 26. The maximum number of 14-AWG conductors allowed in a 3/4-in. PVC conduit (40 % fill) is: A) 9 B) 12 C) 15 D) 18 Answer: B Explanation: 3/4-in. PVC has 0.533 in² internal area; 14-AWG area = 0.0133 in²; 40 % fill = 0.213 in² → 0.213 / 0.0133 ≈ 16.0, but NEC Table C.2 limits to 12 for 14-AWG.
Journeyman Electrician Ultimate Exam
A) All 125-V, 15- and 20-A receptacles in dwellings. B) Only in garages. C) Only in kitchens. D) Only in bedrooms. Answer: A Explanation: NEC 406.12(A) requires TRRs for all 125-V, 15- and 20-A receptacles in dwelling units. Question 31. The minimum size of the disconnecting means for a 30-A air-conditioning unit is: A) 30 A B) 35 A C) 40 A D) 45 A Answer: C Explanation: NEC 440.22 requires a disconnect sized at 125 % of the unit’s full-load current; 30 A × 1.25 = 37.5 A → next standard size is 40 A. Question 32. For a three-phase, 240-V motor rated 10 hp, the minimum conductor size (copper) for the feeder is: A) #8 AWG B) #6 AWG C) #4 AWG D) #2 AWG Answer: C Explanation: Using NEC Table 430.250, a 10-hp, 240-V motor requires at least #4 AWG copper for the feeder. Question 33. The required grounding conductor size for a 30-A branch circuit supplying a receptacle is: A) #14 AWG copper
Journeyman Electrician Ultimate Exam
B) #12 AWG copper C) #10 AWG copper D) #8 AWG copper Answer: B Explanation: NEC Table 250.122 specifies #12 AWG copper for a 30-A circuit. Question 34. In a residential swimming pool, the bonding grid must be installed at a depth of: A) 12 in. below the water line. B) 24 in. below the water line. C) 6 in. below the water line. D) Directly on the pool floor. Answer: D Explanation: NEC 680.26 requires the bonding grid to be installed on the pool floor and extending up the walls. Question 35. Which of the following is a required GFCI protection for a pool pump motor circuit? A) No GFCI required. B) GFCI breaker at the panel. C) GFCI receptacle at the pump. D) Portable GFCI device. Answer: B Explanation: NEC 680.22(A) requires GFCI protection for pool pump motors, typically via a GFCI breaker. Question 36. The minimum ampacity of conductors feeding a residential PV inverter rated at 5 kW (240 V) is: A) 20 A B) 25 A C) 30 A
Journeyman Electrician Ultimate Exam
Answer: B Explanation: Utah R156-55b permits a maximum of four apprentices under the direct supervision of one journeyman. Question 40. The Utah NEC amendment that requires all new residential receptacles to be tamper-resistant was adopted in: A) 2017. B) 2019. C) 2021. D) 2023. Answer: C Explanation: Utah amendment 2021-001 added the tamper-resistant requirement for new residential receptacles. Question 41. The minimum clearance between a service‐entrance raceway and a combustible building surface is: A) 1 in. B) 2 in. C) 3 in. D) 4 in. Answer: B Explanation: NEC 300.21 requires at least 2 in. clearance from combustible material unless protected. Question 42. A 120/240-V single-phase service requires a neutral conductor that is: A) The same size as the ungrounded conductors. B) One size smaller than the ungrounded conductors. C) Two sizes smaller than the ungrounded conductors. D) No neutral required. Answer: A
Journeyman Electrician Ultimate Exam
Explanation: For a 120/240-V service, the neutral must be sized the same as the phase conductors per NEC 220.61. Question 43. The required number of dedicated 20-A circuits for a kitchen’s countertop receptacles is: A) One. B) Two. C) Three. D) Four. Answer: B Explanation: NEC 210.52(C)(1) requires at least two 20-A circuits for countertop receptacles. Question 44. The maximum length of a flexible metal conduit (FMC) run without a support is: A) 3 ft. B) 4 ft. C) 6 ft. D) 8 ft. Answer: C Explanation: NEC 376.30 permits FMC to be unsupported for up to 6 ft. Question 45. When using PVC conduit outdoors, the maximum temperature rating for the conduit is: A) 60 °C. B) 75 °C. C) 90 °C. D) 105 °C. Answer: B Explanation: Schedule 40 PVC conduit is rated for 75 °C in ambient temperatures up to 40 °C.
Journeyman Electrician Ultimate Exam
A) 150 A.
B) 175 A.
C) 200 A.
D) 225 A.
Answer: A Explanation: The disconnect must be rated at least equal to the service rating. Question 50. In a residential dwelling, the maximum number of receptacles allowed on a single 15-A branch circuit in a living room is: A) 8. B) 10. C) 12. D) No specific limit; load calculation applies. Answer: D Explanation: NEC does not set a fixed receptacle count; the circuit must be sized based on load calculations (general lighting load 3 VA per ft²). Question 51. The minimum conduit fill for a single cable assembly (e.g., NM) in a raceway is: A) 15 % B) 20 % C) 25 % D) 40 % Answer: B Explanation: NEC 352.22 permits a single cable assembly to occupy up to 20 % of conduit cross-section. Question 52. The required spacing between a receptacle and a window in a bathroom is: A) 12 in.
Journeyman Electrician Ultimate Exam
B) 18 in. C) 24 in. D) No restriction. Answer: C Explanation: NEC 210.8(A)(1) requires bathroom receptacles to be installed at least 24 in. from the edge of a window. Question 53. A 30-A branch circuit feeding a dryer must have an equipment grounding conductor sized at: A) #14 AWG copper. B) #12 AWG copper. C) #10 AWG copper. D) #8 AWG copper. Answer: C Explanation: Table 250.122 calls for #10 AWG copper for a 30-A circuit. Question 54. The minimum clearance required between a panelboard and any combustible material on the floor is: A) 0 in. (direct contact allowed). B) 6 in. C) 12 in. D) 24 in. Answer: B Explanation: NEC 110.26 requires at least 6 in. clearance from the floor to the bottom of the panelboard. Question 55. Which type of conduit must be installed with a threaded coupling when used outdoors? A) EMT. B) RMC.
Journeyman Electrician Ultimate Exam
D) Four. Answer: B Explanation: NEC 210.11(C)(2) requires a dedicated 20-A circuit for the dryer and a separate 20-A circuit for the washer. Question 59. In a residential attic, NM cable must be protected from physical damage by: A) Running it through bored holes in joists. B) Installing conduit the entire length. C) Using a metal plate where it passes within 7 ft of the floor. D) No protection required if the attic is inaccessible. Answer: C Explanation: NEC 334.15(C) requires NM cable to be protected within 7 ft of the attic floor by a board or plate. Question 60. The required size of a feeder conduit for a 60-A, 240-V subpanel in a detached garage is: A) 1-in. EMT. B) 3/4-in. EMT. C) 1-¼-in. EMT. D) 1-½-in. EMT. Answer: B Explanation: A 60-A feeder using #6 AWG copper conductors (three conductors) fits within a 3/4-in. EMT per conduit fill tables. Question 61. Which of the following is NOT a permitted method for grounding a metal conduit system? A) Using a grounding lug attached to the conduit. B) Connecting the conduit to the equipment grounding conductor at each box. C) Relying on the conduit’s continuity alone without a grounding conductor. D) Bonding the conduit to the grounding electrode system.
Journeyman Electrician Ultimate Exam
Answer: C Explanation: NEC requires a dedicated grounding conductor; conduit continuity alone is insufficient. Question 62. A 120-V, 15-A receptacle installed in a garage must be: A) GFCI protected only. B) AFCI protected only. C) Both GFCI and AFCI protected. D) Neither GFCI nor AFCI protected. Answer: A Explanation: NEC 210.8(A)(2) requires GFCI protection for garage receptacles; AFCI is not required. Question 63. The maximum distance a grounding electrode conductor (GEC) can be run without splicing is: A) 10 ft. B) 25 ft. C) 50 ft. D) No limit if continuous. Answer: D Explanation: NEC 250.64(A) allows a continuous GEC without splices; length is not limited. Question 64. The required minimum size of a feeder conductor feeding a 100-A subpanel using copper is: A) #4 AWG B) #3 AWG C) #2 AWG D) #1 AWG Answer: C
