Download PrepIQ VERMONT Journeyman Electrician Ultimate Exam and more Exams Technology in PDF only on Docsity!
Electrician Ultimate Exam
Question 1. Which of the following formulas correctly expresses the relationship between power (P), voltage (V), and current (I) in a purely resistive AC circuit? A) P = V × I B) P = V / I C) P = I² / V D) P = V² / I Answer: A Explanation: In a resistive circuit, real power equals voltage multiplied by current (P = V·I). Question 2. A 120 V, 60 Hz single-phase circuit has a resistance of 30 Ω. What is the current flowing through the circuit? A) 2 A B) 4 A C) 6 A D) 8 A Answer: B Explanation: Using Ohm’s Law I = V / R = 120 V / 30 Ω = 4 A. Question 3. In a series circuit consisting of three resistors of 10 Ω, 20 Ω, and 30 Ω, what is the total resistance? A) 20 Ω B) 30 Ω C) 40 Ω D) 60 Ω Answer: D Explanation: Series resistances add directly: 10 + 20 + 30 = 60 Ω. Question 4. For a parallel network of two resistors, 40 Ω and 80 Ω, the equivalent resistance is:
Electrician Ultimate Exam
A) 26.7 Ω
B) 30 Ω
C) 53.3 Ω
D) 120 Ω
Answer: A Explanation: 1/R_eq = 1/40 + 1/80 = 0.025 + 0.0125 = 0.0375 → R_eq = 1 / 0. = 26.7 Ω. Question 5. Which NEC article governs the installation of non-metallic sheathed cable (NM)? A) 300. B) 334 C) 352 D) 376 Answer: B Explanation: Article 334 of the NEC specifically addresses NM cable. Question 6. According to the 2023 NEC, the minimum grounding electrode conductor (GEC) size for a 100-A residential service is: A) 6 AWG copper B) 8 AWG copper C) 4 AWG aluminum D) 2 AWG copper Answer: A Explanation: Table 250.66 permits 6 AWG copper for 100 A services. Question 7. A 20-A circuit breaker must protect a branch circuit with a maximum continuous load of 16 A. Which of the following is the correct sizing rule? A) Breaker rating must be 125 % of continuous load B) Breaker rating must equal the continuous load
Electrician Ultimate Exam
Answer: D Explanation: The NEC standard symbol for a circuit breaker is a simple rectangle. Question 11. According to the 2025 Vermont Electrical Safety Rules, the minimum clearance required above a residential service entrance conductor that is 2 in. in diameter is: A) 6 ft B) 8 ft C) 10 ft D) 12 ft Answer: B Explanation: Vermont adopts NEC 230.9 which requires 8 ft clearance for conductors ≥ 1 in. Question 12. A motor rated at 5 hp, 208 V, three-phase, 60 Hz requires a minimum branch-circuit conductor size of: A) 10 AWG copper B) 8 AWG copper C) 6 AWG copper D) 4 AWG copper Answer: C Explanation: Table 430.250 indicates 6 AWG copper for a 5 hp motor at 208 V. Question 13. Which NEC article addresses the requirements for ground-fault circuit interrupters (GFCI) in residential garages? A) 210.8(A)(2) B) 210.8(A)(3) C) 210.8(B)(1) D) 210.8(C)(1) Answer: A
Electrician Ultimate Exam
Explanation: 210.8(A)(2) requires GFCI protection in garages. Question 14. For a 30-A branch circuit feeding a kitchen countertop receptacle, what is the minimum required receptacle rating? A) 15 A B) 20 A C) 30 A D) 40 A Answer: B Explanation: NEC 210.23(A)(2) permits 20-A receptacles on a 30-A branch circuit in a kitchen. Question 15. The ampacity correction factor for a conductor placed in an ambient temperature of 40 °C (104 °F) is: A) 0. B) 0. C) 1. D) 1. Answer: B Explanation: Table 310.15(B)(2)(a) gives a factor of 0.96 for 40 °C. Question 16. When installing EMT conduit, the maximum number of 1/2-in. EMT bends allowed between two pull points spaced 30 ft apart is: A) 4 B) 6 C) 8 D) No specific limit, only pulling force matters Answer: D Explanation: NEC 358.30 permits any number of bends as long as the pulling force does not exceed 100 lb.
Electrician Ultimate Exam
Explanation: NEC 501.10 allows only metal raceways such as RMC in Class I, Division 2 areas. Question 20. For a residential dwelling, the required minimum size of the service entrance conductors for a 200 A service using copper is: A) 2/0 AWG B) 4/0 AWG C) 1/0 AWG D) 3/0 AWG Answer: A Explanation: Table 310.15(B)(16) shows 2/0 AWG copper rated for 200 A. Question 21. Which NEC article governs the installation of receptacles in health-care patient care areas? A) 210.8(D) B) 517. C) 517. D) 300. Answer: B Explanation: Article 517 covers health-care facilities, including receptacle requirements. Question 22. The minimum burial depth for a non-metallic sheathed cable (NM) installed in a residential driveway is: A) 6 in. B) 12 in. C) 18 in. D) 24 in. Answer: B Explanation: NEC 334.15(B) requires a minimum of 12 in. burial for NM in a driveway.
Electrician Ultimate Exam
Question 23. When sizing a feeder for a dwelling with a calculated load of 48 kVA, which demand factor from NEC Table 220.84 is applied? A) 100 % B) 75 % C) 55 % D) 40 % Answer: C Explanation: Table 220.84 provides a 55 % demand factor for the first 10 kVA, then 35 % for the remainder; the overall factor for 48 kVA results in approximately 55 % applied to the first portion. Question 24. Which of the following devices must be installed in a laundry area for a dryer circuit? A) AFCI breaker only B) GFCI receptacle only C) Both AFCI breaker and GFCI receptacle D) Neither AFCI nor GFCI is required Answer: C Explanation: NEC 210.8(A)(11) requires GFCI protection for dryer receptacles, and 210.12(A) requires AFCI protection for laundry circuits. Question 25. A 250 V, 3-phase, 60 Hz transformer has a primary rating of 150 kVA. What is the minimum size of the primary overcurrent protective device? A) 150 A B) 175 A C) 200 A D) 250 A Answer: C Explanation: NEC 450.3(B) requires the OCPD to be 125 % of the transformer’s full-load current. Primary full-load current = 150 kVA / (√ 3 × 250 V) = 346 A; 125 %
Electrician Ultimate Exam
Question 29. Which of the following is the correct minimum spacing between a 120 - V branch circuit and a 480-V industrial circuit in the same conduit? A) 2 in. B) 4 in. C) 6 in. D) No spacing required if same conduit is used Answer: D Explanation: NEC 300.3(C)(1) permits conductors of different systems to share the same raceway if voltage rating is appropriate; spacing is not required. Question 30. In a three-wire branch circuit feeding two 120-V loads, what is the purpose of the shared neutral? A) To provide a ground path B) To reduce voltage drop C) To carry the unbalanced current between the two hot conductors D) To increase the circuit’s ampacity Answer: C Explanation: The shared neutral carries only the difference (unbalanced current) between the two hot legs. Question 31. According to Vermont statutes, a journeyman electrician must be supervised by a licensed master electrician when performing work on: A) Residential single-family dwellings only B) Any commercial installation C) All electrical work, regardless of location D) Only high-voltage (>600 V) systems Answer: C Explanation: Title 26 V.S.A. Chapter 15 requires journeyman work to be under master electrician supervision for all installations.
Electrician Ultimate Exam
Question 32. The minimum size of a grounding electrode conductor for a 400-A service using aluminum conductors is: A) 4/0 AWG aluminum B) 2/0 AWG aluminum C) 1/0 AWG aluminum D) 3/0 AWG aluminum Answer: A Explanation: Table 250.66 permits 4/0 AWG aluminum for 400 A services. Question 33. Which NEC article governs the installation of luminaires in damp locations such as covered porches? A) 410.10(D) B) 410.10(C) C) 410.12(A) D) 410.16(A) Answer: B Explanation: Article 410.10(C) specifies requirements for luminaires in damp locations. Question 34. A 15-A, 120-V receptacle in a kitchen must be GFCI protected. Which of the following devices can provide that protection? A) A two-pole AFCI breaker only B) A GFCI receptacle only C) A 20-A standard breaker only D) Either a GFCI receptacle or a GFCI breaker Answer: D Explanation: NEC 210.8(A)(6) allows either a GFCI receptacle or a GFCI breaker for kitchen countertop outlets. Question 35. When installing a motor disconnect with a rating of 30 hp, what is the minimum voltage rating of the disconnect?
Electrician Ultimate Exam
A) 210.52(C)(1)
B) 210.8(A)(11)
C) 210.50(A)
D) 210.62(A)
Answer: C Explanation: Article 210.50(A) specifies that bathroom receptacles must be installed no higher than 48 in. above the floor. Question 39. When installing a 3-wire, 120/240-V branch circuit for a dryer, the required size for the equipment grounding conductor is: A) 12 AWG copper B) 10 AWG copper C) 8 AWG copper D) 6 AWG copper Answer: A Explanation: Table 250.122 permits 12 AWG copper for a 30-A circuit, which is typical for dryer circuits. Question 40. The NEC requires that a receptacle in a garage be GFCI protected if it is within how many feet of a sink? A) 3 ft B) 6 ft C) 8 ft D) 10 ft Answer: B Explanation: NEC 210.8(A)(2) requires GFCI protection for receptacles within 6 ft of a sink. Question 41. Which of the following is the correct minimum conduit fill percentage for more than two conductors in a raceway? A) 40 %
Electrician Ultimate Exam
B) 45 %
C) 53 %
D) 60 %
Answer: C Explanation: NEC Chapter 9 Table 1 allows up to 53 % fill for three or more conductors. Question 42. In a residential dwelling, the minimum size of a grounding electrode conductor for a 150-A service using copper conductors is: A) 8 AWG B) 6 AWG C) 4 AWG D) 2 AWG Answer: B Explanation: Table 250.66 lists 6 AWG copper for a 150-A service. Question 43. Which NEC article addresses the installation of electric vehicle (EV) charging equipment? A) 625 B) 630 C) 640 D) 690 Answer: A Explanation: Article 625 covers EV charging systems. Question 44. A 12-kW, 240-V heat pump requires what minimum size breaker? A) 20 A B) 30 A C) 40 A
Electrician Ultimate Exam
C) Licensed as a master electrician only D) Supervised by a journeyman electrician Answer: B Explanation: The rules require lockout/tagout training and personal protective equipment. Question 48. Which NEC article governs the installation of fire alarm wiring in a commercial building? A) 760 B) 750 C) 770 D) 800 Answer: B Explanation: Article 750 addresses fire alarm systems. Question 49. For a 30-A, 240-V circuit feeding a wall-mounted electric range, the minimum size of the equipment grounding conductor is: A) 12 AWG copper B) 10 AWG copper C) 8 AWG copper D) 6 AWG copper Answer: B Explanation: Table 250.122 permits 10 AWG copper for a 30-A circuit. Question 50. In a three-phase, 4-wire feeder, the neutral must be sized to carry the maximum unbalanced load. If the total calculated unbalanced load is 50 A, the neutral conductor should be at least: A) 4 AWG copper B) 6 AWG copper C) 8 AWG copper
Electrician Ultimate Exam
D) 10 AWG copper Answer: B Explanation: Using Table 310.15(B)(16), 6 AWG copper is rated for 65 A, satisfying the 50 A unbalanced load. Question 51. Which NEC article requires that all receptacles in a dwelling unit be tamper-resistant (TR) unless an exception applies? A) 210.52(A) B) 210.8(A) C) 406.4(D) D) 406.9(A) Answer: C Explanation: Article 406.4(D) mandates TR receptacles in dwelling units. Question 52. When installing a conduit system in a garage, the maximum number of 3/4-in. EMT bends permitted between pull points spaced 30 ft apart is: A) 4 B) 6 C) 8 D) Not limited by number of bends, only by pull force Answer: D Explanation: NEC does not limit the number of bends; pull force is the limiting factor. Question 53. A 30-kW, 480-V, three-phase motor requires a short-circuit protective device (SCPD) rated at what minimum amperage? A) 30 A B) 45 A C) 60 A D) 75 A
Electrician Ultimate Exam
Answer: B Explanation: NEC 376.30 requires FMC to be supported at intervals not exceeding 6 ft. Question 57. Which NEC article addresses the installation of swimming pool wiring? A) 680 B) 690 C) 700 D) 710 Answer: A Explanation: Article 680 covers swimming pools, fountains, and similar installations. Question 58. For a 12-kW, 240-V electric water heater installed in a dwelling, the minimum size of the branch-circuit breaker is: A) 20 A B) 30 A C) 40 A D) 50 A Answer: C Explanation: Current = 12 kW / 240 V = 50 A; water heater is a continuous load, so breaker must be 125 % × 50 A = 62.5 A → next standard size is 70 A. However, NEC 422.13 permits a 30 A breaker for water heaters up to 4500 W; for 12 kW, a 50 A breaker is required. The correct answer is D (50 A is the calculated load, but a 60 A breaker is needed for the 125 % factor). Question 59. Which NEC article governs the installation of conduit and raceway systems made of non-metallic materials? A) 352 B) 358 C) 376
Electrician Ultimate Exam
D) 380
Answer: A Explanation: Article 352 addresses non-metallic raceways and tubing. Question 60. In a commercial office building, the minimum number of receptacle outlets required per floor per 100 ft² of floor area is: A) 1 B) 2 C) 3 D) 4 Answer: B Explanation: NEC 210.52(A)(1) requires at least one receptacle per 200 ft²; thus two per 100 ft². Question 61. Which of the following is the correct method for grounding a metal conduit that serves as the equipment grounding conductor? A) Connect the conduit to the neutral at the service panel only B) Bond the conduit at each enclosure using a grounding screw or clamp C) No bonding is required if the conduit is continuous D) Use a separate grounding electrode conductor for the conduit Answer: B Explanation: NEC 250.118 requires bonding the metal conduit at each enclosure. Question 62. For a 15-A, 120-V receptacle installed in a dwelling unit, the minimum wire size is: A) 14 AWG copper B) 12 AWG copper C) 10 AWG copper D) 8 AWG copper Answer: A
