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Question 1. In a DC circuit, if the resistance is 10 Ω and the current is 2 A, what is the voltage across the resistor? A) 5 V B) 10 V C) 20 V D) 40 V Answer: C Explanation: Ohm’s Law V = I × R → 2 A × 10 Ω = 20 V. Question 2. A residential branch circuit supplies a 120 V load drawing 5 A. What is the power consumed? A) 250 W B) 600 W C) 12 W D) 2 kW Answer: A Explanation: P = V × I = 120 V × 5 A = 600 W (option B). Correction: The correct calculation yields 600 W, so answer B. Question 3. In a series circuit with three equal resistors, the total resistance is 30 Ω. What is the voltage drop across each resistor if the source voltage is 90 V? A) 10 V B) 15 V C) 30 V D) 90 V Answer: B Explanation: Each resistor = 10 Ω; total current I = V/R_total = 90 V/30 Ω = 3 A. Voltage drop per resistor V = I × R = 3 A × 10 Ω = 30 V? Wait error. Actually each resistor drop = 90 V/3 = 30 V, so answer C. Question 4. For a parallel circuit with two branches, one branch has 6 Ω and the other 12 Ω. What is the equivalent resistance?
Journeyman Electrician Ultimate
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A) 4 Ω
B) 8 Ω
C) 12 Ω
D) 18 Ω
Answer: A Explanation: 1/R_eq = 1/6 + 1/12 = 2/12 + 1/12 = 3/12 → R_eq = 12/3 = 4 Ω. Question 5. The NEC recommends a maximum voltage drop of 3 % for branch circuits. For a 120 V lighting circuit, what is the maximum allowable drop? A) 0.36 V B) 1.2 V C) 3.6 V D) 6 V Answer: C Explanation: 3 % of 120 V = 0.03 × 120 = 3.6 V. Question 6. A 100-ft run of 12 AWG copper THHN is used for a 20 A branch circuit. Using a voltage-drop calculator, the drop is 2.2 V. Is this acceptable? A) Yes, because it is under 3 % B) No, because it exceeds 3 % C) Yes, because the NEC allows up to 5 % D) No, because copper must be under 1 % Answer: A Explanation: 2.2 V / 120 V = 1.83 %, which is below the 3 % limit. Question 7. According to NEC Article 220, the general lighting load for a dwelling is calculated as ___ VA per square foot. A) 1 VA B) 3 VA C) 5 VA D) 10 VA
Journeyman Electrician Ultimate
Exam
Question 11. NEC Table 310.16 lists the ampacity of 90 °C rated copper conductors. What is the ampacity of 3 AWG copper at 75 °C? A) 85 A B) 100 A C) 115 A D) 130 A Answer: B Explanation: Table 310.16 shows 3 AWG copper at 75 °C rated for 100 A. Question 12. A conduit run contains four current-carrying conductors in an ambient temperature of 40 °C. Using NEC Table 310.15(B)(2)(a), what correction factor applies? A) 1. B) 0. C) 0. D) 0. Answer: B Explanation: For >3 conductors, correction factor at 40 °C is 0.91. Question 13. Type NM-B cable must be secured within how many inches of a non-metallic box? A) 4 in. B) 6 in. C) 8 in. D) 12 in. Answer: B Explanation: NEC 334.30 requires NM cable to be secured within 6 in. of the box. Question 14. Aluminum conductors require a minimum torque of ___ in-lb on a copper terminal. A) 5 in-lb
Journeyman Electrician Ultimate
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B) 10 in-lb C) 15 in-lb D) 20 in-lb Answer: C Explanation: NEC 110.14(C) specifies 15 in-lb torque for aluminum on copper terminals. Question 15. According to NEC Annex C, the maximum number of 12-AWG THHN conductors that may be placed in 1/2-in. EMT is: A) 9 B) 12 C) 15 D) 18 Answer: B Explanation: Annex C Table 1 lists 12 conductors of 12-AWG in 1/2-in. EMT. Question 16. For box-fill calculations, each insulated conductor that terminates in a box counts as: A) 1 unit B) 2 units C) 3 units D) 4 units Answer: B Explanation: NEC 314.16(B) assigns 2 units (each unit = 1/2 in³) for each conductor that terminates. Question 17. The minimum clear working space in front of a panelboard rated 600 A or less is: A) 30 in. wide, 36 in. deep, 6 ft. high B) 30 in. wide, 42 in. deep, 6 ft. high C) 36 in. wide, 36 in. deep, 6 ft. high D) 36 in. wide, 42 in. deep, 6 ft. high
Journeyman Electrician Ultimate
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Question 21. Which of the following is NOT an acceptable grounding electrode? A) Ground-ring B) Metal underground water pipe C) Concrete-encased electrode D) Plastic water pipe Answer: D Explanation: Plastic piping cannot serve as a grounding electrode per NEC 250.52(A)(1). Question 22. For a 20 A circuit protected by a 20 A breaker, the minimum size of the equipment grounding conductor (EGC) is: A) 14 AWG copper B) 12 AWG copper C) 10 AWG copper D) 8 AWG copper Answer: A Explanation: NEC Table 250.122 specifies 14 AWG copper for a 20 A overcurrent device. Question 23. Bonding of a metal water pipe is required when: A) The pipe is within 5 ft of the service equipment B) The pipe is part of a sprinkler system C) The pipe is used for potable water and is not isolated from the grounding system D) The pipe is insulated with PVC Answer: C Explanation: NEC 250.104(A) requires bonding of metal water piping that is part of the grounding electrode system. Question 24. GFCI protection is required for which of the following residential locations? A) Living room receptacles
Journeyman Electrician Ultimate
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B) Kitchen countertop receptacles C) Hallway lighting fixtures D) Basement ceiling fans Answer: B Explanation: NEC 210.8(A) mandates GFCI for all receptacles serving countertop surfaces in kitchens. Question 25. AFCI protection is required for which area in a single-family dwelling? A) Garages B) Bathrooms C) Bedrooms D) All of the above Answer: D Explanation: NEC 210.12(A) requires AFCI protection for all 120-V, single-phase, 15 - and 20-A branch circuits supplying dwelling unit bedrooms, living rooms, kitchens, etc., including garages and bathrooms. Question 26. A receptacle in a damp location must be labeled “WR” and have which type of cover? A) Standard cover plate B) In-use (bubble) cover C) Weather-resistant (in-use) cover D) No cover required Answer: C Explanation: NEC 406.9(C) requires WR devices in damp or wet locations to have weather-resistant in-use covers. Question 27. For a residential pool pump motor, the bonding jumper between the metal enclosure and the pool’s grounding electrode must be sized as: A) Same size as the largest ungrounded conductor B) Minimum 8 AWG copper
Journeyman Electrician Ultimate
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Answer: C Explanation: The rule allows up to three apprentices per journeyman on residential electrical work. Question 31. Which license type in Utah authorizes the holder to perform all electrical work, including design and inspection? A) Residential Journeyman B) Master Electrician C) Apprentice Electrician D) Specialty Electrician Answer: B Explanation: A Utah Master Electrician license permits unlimited scope, including design and inspection. Question 32. OSHA requires that workers exposed to an arc flash risk wear which minimum level of PPE? A) Class 0 B) Class 1 C) Class 2 D) Class 3 Answer: B Explanation: OSHA 29 CFR 1910.269 requires at least Class 1 arc-flash PPE for most residential work. Question 33. The Lockout/Tagout (LOTO) procedure for a residential circuit requires: A) Only a tag on the breaker B) Only a lock on the breaker C) Both a lock and a tag placed by the worker performing the service D) No lock or tag if the circuit is de-energized Answer: C Explanation: OSHA 1910.147 mandates both a lock and a tag placed by the person applying the lockout.
Journeyman Electrician Ultimate
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Question 34. When working on a roof, the minimum ladder angle to ensure safety is: A) 45 degrees B) 53 degrees C) 60 degrees D) 75 degrees Answer: B Explanation: OSHA recommends a 4:1 ratio, which equals about 53 degrees. Question 35. A 3-way switching circuit requires how many traveler conductors between the two 3-way switches? A) One B) Two C) Three D) Four Answer: B Explanation: Two travelers connect the two 3-way switches. Question 36. In a residential evaporative cooler motor circuit, the motor is rated 1 HP, 230 V, 3-phase. What is the minimum size of the grounding conductor per Table 250.122? A) 12 AWG copper B) 10 AWG copper C) 8 AWG copper D) 6 AWG copper Answer: B Explanation: A 1-HP, 230-V motor typically uses a 15-A breaker; Table 250. calls for 10 AWG copper for a 15-A overcurrent device.
Journeyman Electrician Ultimate
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A) 10 AWG copper B) 8 AWG copper C) 6 AWG copper D) 4 AWG copper Answer: B Explanation: NEC 310.15(B)(16) shows 8 AWG copper rated for 40 A at 75 °C, satisfying a 30-A breaker. Question 41. Which NEC article governs the installation of receptacles in garages? A) 210.8(A) B) 210.11(C) C) 210.52(B) D) 210.7(A) Answer: A Explanation: NEC 210.8(A)(2) requires GFCI protection for garage receptacles. Question 42. The NEC allows a single 120/240-V service entrance conductor to serve a duplex house with a total load of 150 A if the conductor is sized for ___ % of the load. A) 80 % B) 83 % C) 90 % D) 100 % Answer: B Explanation: The 83 % rule permits sizing the service conductors at 83 % of the calculated load. Question 43. When using non-metallic (NM) cable in a stud cavity, the cable must be protected from physical damage by: A) Running it through metal conduit the entire length B) Installing it within 1 in. of the face of the stud
Journeyman Electrician Ultimate
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C) Using a protective plate or running it through a bored hole at least 1 in. from the edge of the stud D) No protection is required Answer: C Explanation: NEC 334.15 requires NM cable to be protected from damage, often by a nail plate or by boring holes at least 1 in. from the stud edge. Question 44. The maximum number of 14-AWG THHN conductors that may be placed in a 3/4-in. PVC conduit is: A) 13 B) 16 C) 20 D) 24 Answer: C Explanation: Annex C Table 1 lists 20 conductors of 14-AWG THHN in 3/4-in. PVC. Question 45. A junction box contains three 12-AWG insulated conductors, two device yokes, and one internal clamp. How many cubic inches of volume are required? A. 12 in³ B. 18 in³ C. 24 in³ D. 30 in³ Answer: C Explanation: Each insulated conductor = 2 units (2 × 0.5 in³ = 1 in³). Three conductors = 3 in³. Each device yoke = 2 units = 1 in³; two yokes = 2 in³. One internal clamp = 1 unit = 0.5 in³. Total = 3 + 2 + 0.5 = 5.5 in³. However NEC requires rounding up to the next whole unit (0.5 in³). The nearest answer is 6 in³, which is not listed; the closest is 12 in³ (option A). Therefore answer A. Question 46. The minimum clearance in front of a service disconnect in a residential garage is: A) 30 in. wide, 36 in. deep, 6 ft. high B) 30 in. wide, 42 in. deep, 6 ft. high
Journeyman Electrician Ultimate
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Answer: A Explanation: NEC 310.15(B)(16) lists 10 AWG copper rated 30 A at 60 °C, suitable for dryer circuits. Question 50. Under Utah’s DOPL rules, a residential apprentice may work unsupervised after completing how many hours of on-the-job training? A) 500 hours B) 1,000 hours C) 1,500 hours D) 2,000 hours Answer: C Explanation: Utah DOPL requires a minimum of 1,500 hours of supervised on-the-job training before unsupervised work. Question 51. Which of the following is a permitted method for protecting a conduit run that passes through a joist? A) No protection needed B) Use a metal strap every 4 ft. C) Install a protective plate at the entry point only D) Boring the hole at least 1 in. from the joist edge Answer: D Explanation: NEC 300.4(A) requires holes to be at least 1 in. from the edge to protect the conduit. Question 52. A residential circuit feeding a bathroom fan is required to have which of the following protection devices? A) GFCI only B) AFCI only C) Both GFCI and AFCI D) Neither, standard breaker is sufficient Answer: A Explanation: NEC 210.8(A)(1) mandates GFCI protection for bathroom receptacles and fan circuits; AFCI is not required for this specific fan circuit.
Journeyman Electrician Ultimate
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Question 53. When using a 4-wire NM cable for a 240-V appliance, which conductor is used as the equipment grounding conductor? A) The white (neutral) conductor B) The bare or green conductor C) The red conductor D) The black conductor Answer: B Explanation: NM cable includes a bare or green insulated conductor for grounding. Question 54. The maximum number of bends allowed in a single length of EMT without a conduit body is: A) 2 bends with a total angle of 90° B) 3 bends with a total angle of 180° C) 4 bends with a total angle of 360° D) No limit, as long as the conduit is not damaged Answer: B Explanation: NEC 358.12 permits up to three bends totaling 180° in a conduit run without a conduit body. Question 55. A 20-A GFCI breaker protects a kitchen countertop circuit. If a ground fault of 4 mA occurs, what will the breaker do? A) Trip immediately B) Trip after 30 seconds C) Not trip, because the fault is below the 5 mA threshold D) Trip only if the fault persists for more than 1 second Answer: A Explanation: GFCI devices trip on ground-fault currents as low as 4– 6 mA, so a 4 mA fault will cause an immediate trip.
Journeyman Electrician Ultimate
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A) Standard duplex receptacle B) Single-pole breaker C) Outdoor GFCI receptacle D) LED wall-mount fixture Answer: C Explanation: Outdoor GFCI receptacles must be weather-resistant (WR) per NEC 406.9(C). Question 60. The minimum size of a copper grounding electrode conductor (GEC) for a 200-A service using a ground rod is: A) 8 AWG B) 6 AWG C) 4 AWG D) 2 AWG Answer: B Explanation: NEC Table 250.66 calls for 6 AWG copper for a 200-A service grounding electrode conductor. Question 61. When installing a 30-A two-pole breaker for a dryer, the neutral conductor must be sized at least: A) 12 AWG copper B) 10 AWG copper C) 8 AWG copper D) 6 AWG copper Answer: B Explanation: NEC 210.19(A)(1) requires the neutral to be sized for the unbalanced load; 10 AWG copper is suitable for a 30-A circuit. Question 62. Which NEC article addresses the installation of electric vehicle (EV) charging equipment in dwellings? A) 625 B) 630
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C) 640
D) 690
Answer: A Explanation: NEC Article 625 covers electric vehicle charging systems. Question 63. A 12-AWG copper conductor is used as a feeder in a raceway with 5 current-carrying conductors at 30 °C ambient temperature. What is the corrected ampacity? A) 20 A B) 25 A C) 30 A D) 35 A Answer: B Explanation: Base ampacity for 12 AWG copper at 75 °C is 25 A. With > conductors, apply 0.91 correction factor → 25 A × 0.91 ≈ 22.8 A, rounded up to 25 A (option B). Question 64. The NEC allows the use of a flexible metal conduit (FMC) as a grounding electrode conductor. What is the minimum size of FMC that can be used for a 100-A service? A) 1/2-in. B) 3/4-in. C) 1-in. D) 1¼-in. Answer: A Explanation: FMC of 1/2-in. is permitted as a grounding electrode conductor for up to 100 A per NEC 250.118. Question 65. In a residential wiring diagram, a “black” wire connected to a “white” wire at a switch indicates which of the following? A) A standard hot-to-neutral connection B) A switched-hot return to the fixture C) A neutral-to-ground fault
