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Electrician Ultimate Exam
Question 1. Which equation correctly represents Ohm’s Law? A) P = VI B) V = IR C) I = V/R² D) R = V + I Answer: B Explanation: Ohm’s Law states that voltage (V) equals current (I) multiplied by resistance (R), expressed as V = IR. Question 2. A 120 V circuit draws 10 A. What is the power consumption? A) 12 W B) 120 W C) 1,200 W D) 12,000 W Answer: C Explanation: Power P = V × I = 120 V × 10 A = 1,200 W. Question 3. In a series circuit with three resistors of 4 Ω, 6 Ω, and 10 Ω, the total resistance is: A) 20 Ω B) 10 Ω C) 6 Ω D) 4 Ω Answer: A Explanation: Series resistance adds directly: 4 Ω + 6 Ω + 10 Ω = 20 Ω. Question 4. Two 12 Ω resistors are connected in parallel. What is the equivalent resistance? A) 24 Ω
Electrician Ultimate Exam
B) 6 Ω
C) 12 Ω
D) 3 Ω
Answer: B Explanation: 1/Req = 1/12 + 1/12 = 2/12 → Req = 12/2 = 6 Ω. Question 5. The inductive reactance (XL) of a coil at 60 Hz is 31.4 Ω. What is its inductance? A) 0.083 H B) 0.53 H C) 1.0 H D) 2.0 H Answer: A Explanation: XL = 2πfL → L = XL / (2πf) = 31.4 / (2π·60) ≈ 0.083 H. Question 6. A capacitor has a reactance of 20 Ω at 50 Hz. What is its capacitance? A) 159 μF B) 31.8 μF C) 100 μF D) 200 μF Answer: B Explanation: Xc = 1/(2πfC) → C = 1/(2πfXc) = 1/(2π·50·20) ≈ 3.18 × 10⁻⁵ F = 31.8 μF. Question 7. According to NEC Article 100, “equipment grounding conductor” is defined as: A) A conductor that carries fault current to the earth. B) A conductor that connects non-current-carrying metal parts to the grounding electrode system.
Electrician Ultimate Exam
C) 35 A
D) 40 A
Answer: B Explanation: The breaker must be sized at or above the calculated load but not exceed the conductor ampacity; a 30 A dryer circuit uses a 30 A breaker. Question 11. Which of the following locations requires GFCI protection for a 120 V receptacle? A) A garage ceiling light. B) A bedroom outlet. C) A laundry room countertop. D) A hallway switch. Answer: C Explanation: NEC 210.8(A) mandates GFCI protection for receptacles in laundry areas. Question 12. An AFCI protected circuit is required in which residential area? A) Outdoors B) Kitchen countertop C) Bathroom vanity D) Living room Answer: B Explanation: NEC 210.12(A) requires AFCI protection for all 120 V, 15- and 20-A branch circuits supplying kitchen countertop outlets. Question 13. The required clear working space in front of a panelboard rated 600 V or less is: A) 24 in. B) 30 in. C) 36 in.
Electrician Ultimate Exam
D) 42 in. Answer: C Explanation: NEC 110.26(A)(1) requires at least 36 in. of clear working space in front of equipment. Question 14. A grounding electrode must be at least how many feet in length when using a ground rod? A) 4 ft B) 6 ft C) 8 ft D) 10 ft Answer: B Explanation: NEC 250.52(A)(5) requires a minimum of 8 ft for a ground rod, but the most common practice is 8 ft; however, the minimum length recognized in the code is 8 ft, not 6 ft. Correction: The correct answer is C (8 ft). Answer: C Explanation: NEC 250.52(A)(5) specifies a minimum of 8 ft for a ground rod. Question 15. The size of an equipment grounding conductor for a 60 A circuit using copper THHN is: A) #12 AWG B) #10 AWG C) #8 AWG D) #6 AWG Answer: B Explanation: NEC Table 250.122 shows #10 AWG copper for overcurrent devices rated 60 A to 100 A. Question 16. For a service with a 200 A feeder, the grounding electrode conductor (GEC) size per Table 250.66 is:
Electrician Ultimate Exam
Explanation: Adjustment factors apply only when more than three conductors are in a raceway and ambient temperature exceeds 30 °C. With only four conductors at 30 °C, no derating is required; factor remains 100 %. Question 19. The maximum fill for a ½-in. EMT conduit with three #12 AWG THHN conductors is: A) 12 % B) 20 % C) 40 % D) 53 % Answer: C Explanation: EMT (non-flexible metal) allows up to 40 % fill for more than two conductors. The total cross-sectional area of three #12 AWG THHN fits within the 40 % limit for ½-in. EMT. Question 20. The minimum size of a junction box for a single device with three #12 AWG conductors is: A) 2 in. cubic inches B) 4 in. cubic inches C) 6 in. cubic inches D) 8 in. cubic inches Answer: B Explanation: Box fill: each conductor counts as 1 unit (2.25 in³ for #12). Three conductors = 6.75 in³. Add 2.25 in³ for the device = 9 in³. Minimum box size must be at least 9 in³; the smallest standard box meeting that is 4 in. cubic inches (actually 4 in. deep × 4 in. square = 16 in³). Therefore answer B. Question 21. Which cable type is permitted for use in a wet location without additional protection? A) NM-B B) AC C) UF D) MC
Electrician Ultimate Exam
Answer: C Explanation: UF (Underground Feeder) cable is rated for direct burial and wet locations. Question 22. When selecting conduit for a 4-in. schedule 40 PVC run, the maximum number of #6 AWG THHN conductors permitted (derating not required) is: A) 6 B) 8 C) 10 D) 12 Answer: D Explanation: PVC conduit fill tables allow up to 12 #6 AWG THHN in a 4-in. schedule 40 PVC without exceeding 40 % fill. Question 23. A luminaire installed in a clothes closet must be: A) Listed for damp locations. B) Listed for wet locations. C) Listed for recessed dry locations only. D) Listed for a closet location (NEC 410.10). Answer: D Explanation: NEC 410.10 specifies that luminaires in closets must be listed for closet locations. Question 24. A 240 V, 30 A dryer requires a disconnecting means. The minimum size of the disconnect switch is: A) 20 A B) 30 A C) 40 A D) 50 A
Electrician Ultimate Exam
Answer: C Explanation: NEC Table 430.52 allows a breaker size of 150 % of FLA for non-continuous motor loads: 12 A × 1.5 = 18 A. The next standard size is 20 A, but 18 A is acceptable as a listed size. Question 28. The thermal overload protection for the same 7 HP motor must be set at what percentage of FLA? A) 80 % B) 115 % C) 125 % D) 150 % Answer: C Explanation: NEC 430.32 requires overload protection set between 115 % and 125 % of the motor’s FLA. 125 % is the maximum permissible. Question 29. For a motor circuit with a short-circuit rating of 10 kA, the selected breaker must have a breaking capacity of at least: A) 5 kA B) 10 kA C) 15 kA D) 20 kA Answer: B Explanation: The breaker’s interrupting rating must be equal to or greater than the circuit’s available fault current; thus a minimum of 10 kA is required. Question 30. The required distance between a motor disconnecting means and the motor controller for a 30 HP motor is: A) 3 ft B) 6 ft C) 10 ft D) No specific distance required
Electrician Ultimate Exam
Answer: D Explanation: NEC 430.102 does not specify a minimum distance; the disconnect can be located at the same point as the controller if space permits. Question 31. In a Class I, Division 2 hazardous location, which cable is permitted? A) NM-B B) MC with metal armor C) THHN in conduit D) PVC conduit with THHN Answer: C Explanation: In Class I, Division 2, conductors must be installed in a raceway; THHN in conduit is acceptable. Question 32. A health-care patient-care area requires which type of receptacle? A) Standard 15 A receptacle. B) GFCI-protected receptacle. C) Isolated ground receptacle. D) Tamper-resistant receptacle. Answer: D Explanation: NEC 517.13 requires tamper-resistant receptacles in patient-care areas. Question 33. The bonding grid for a swimming pool must be installed at what depth below the water surface? A) 12 in. B) 18 in. C) 24 in. D) 30 in.
Electrician Ultimate Exam
Answer: D Explanation: NEC 770.32 permits fiber optic cables to be installed in the same raceway as power conductors without separation, provided the raceway is appropriate. Question 37. For a CAT-5e communication cable run, the grounding conductor must be sized as per: A) Table 250.122. B) Table 250.66. C) Table 250.122 does not apply; grounding is not required. D) Table 250.118. Answer: C Explanation: Communication cables are low-voltage and typically do not require an equipment grounding conductor; grounding is provided by the metal conduit or raceway. Question 38. The maximum number of conductors allowed in a 3/4-in. EMT conduit without exceeding 40 % fill is: A) 6 #12 AWG THHN B) 9 #14 AWG THHN C) 12 #12 AWG THHN D) 15 #14 AWG THHN Answer: B Explanation: Using conduit fill tables, a 3/4-in. EMT can accommodate up to 9 #14 AWG THHN conductors within the 40 % fill limit. Question 39. The NEC requires a minimum of how many disconnecting means for a 3-phase motor rated 10 HP? A) One B) Two C) Three
Electrician Ultimate Exam
D) Four Answer: A Explanation: NEC 430.102 requires one disconnecting means per motor, regardless of horsepower. Question 40. When a feeder supplies more than one panelboard, the feeder must be protected by: A) A single breaker sized for the total load. B) Multiple breakers sized for each panelboard. C) A fuse only. D) No overcurrent protection if the feeder is underground. Answer: A Explanation: A feeder is protected by a single overcurrent device sized for the calculated load per NEC 215.3. Question 41. The voltage drop limit recommended for feeder circuits is: A) 1 % B) 2 % C) 3 % D) 5 % Answer: C Explanation: NEC recommends a maximum of 3 % voltage drop for feeders and branch circuits combined. Question 42. A 120/240 V, single-phase service requires a neutral conductor sized at: A) Same size as the ungrounded conductors. B) One size larger than the ungrounded conductors. C) Half the size of the ungrounded conductors. D) No neutral required.
Electrician Ultimate Exam
Answer: A Explanation: When metal conduit is used as an EGC, it must be bonded (grounded) at each end per NEC 250.118. Question 46. The required conduit fill for a single 4-in. rigid metal conduit (RMC) containing a 500-kcmil copper conductor is: A) 20 % B) 30 % C) 40 % D) 53 % Answer: C Explanation: For more than two conductors, the maximum fill is 40 % (NEC Chapter 9, Table 1). A single large conductor still follows the same limit. Question 47. A receptacle installed in a bathtub enclosure must be: A) GFCI-protected. B) AFCI-protected. C) Both GFCI and AFCI protected. D) Neither; it is prohibited. Answer: A Explanation: NEC 210.8(A)(10) requires GFCI protection for receptacles located within bathtub or shower spaces. Question 48. Which of the following is NOT permitted as a grounding electrode? A) Ground rod. B) Metal underground water pipe. C) Concrete-encased electrode (Ufer). D) Aluminum siding.
Electrician Ultimate Exam
Answer: D Explanation: Aluminum siding is not an acceptable grounding electrode per NEC 250.52. Question 49. The ampacity of a #4 AWG copper conductor in a raceway with an ambient temperature of 40 °C is: A) 55 A B) 70 A C) 85 A D) 95 A Answer: C Explanation: At 40 °C, the temperature correction factor is 0.91. Base ampacity for #4 AWG copper (75 °C) is 95 A. 95 A × 0.91 ≈ 86 A (rounded to 85 A). Question 50. For a 3-phase, 4-wire feeder supplying a 120/208 V load, the neutral conductor may be omitted if: A) The load is balanced. B) The feeder is under 100 A. C) The feeder is underground. D) The feeder uses PVC conduit. Answer: A Explanation: NEC 220.61 allows omission of the neutral when the 3-phase load is perfectly balanced. Question 51. The minimum conduit size for a 3-phase, 400 A feeder using 500 kcmil aluminum conductors is: A) 3 in. EMT B) 4 in. RMC C) 5 in. PVC D) 6 in. RMC
Electrician Ultimate Exam
Answer: B Explanation: NEC 450.3(B) allows overcurrent protection for transformer primary up to 150 % of the full-load current. Question 55. The required size of a grounding electrode conductor for a 600 A service using copper is: A) #2 AWG B) #4 AWG C) #6 AWG D) #8 AWG Answer: B Explanation: Table 250.66 indicates #4 AWG copper for services 400 A to 600 A. Question 56. A 12 kW motor operating at 480 V, 3-phase has a full-load current of approximately: A) 14 A B) 18 A C) 24 A D) 30 A Answer: B Explanation: I = P / (√3 × V × efficiency). Assuming 90 % efficiency, I ≈ 12,000 / (1.732 × 480 × 0.9) ≈ 15.6 A, rounded to the next standard size 18 A. Question 57. The minimum clearance between a panelboard and a combustible wall is: A) 1 ft B) 2 ft C) 3 ft D) No clearance required if the wall is fire-rated.
Electrician Ultimate Exam
Answer: C Explanation: NEC 110.26(A)(1) requires a minimum of 3 ft of clear working space in front of equipment, which includes clearance from combustible surfaces. Question 58. Which of the following is a permissible method for grounding a metal water pipe system? A) Using a separate grounding electrode rod. B) Bonding the pipe to the grounding electrode conductor at the service. C) Connecting the pipe to the equipment grounding conductor at each fixture. D) No grounding required for water pipes. Answer: B Explanation: NEC 250.104(A)(1) requires bonding metal water piping to the grounding electrode system at the service equipment. Question 59. In a commercial building, the load calculation for continuous loads must be multiplied by: A) 1. B) 1. C) 1. D) 1. Answer: C Explanation: NEC 210.20(A) requires continuous loads to be multiplied by 125 % (1.25) for sizing conductors and overcurrent devices. Question 60. The minimum size of a grounding electrode conductor for a 150 kW, 13.8 kV transformer is: A) #4 AWG copper B) #2 AWG copper C) #1/0 AWG copper D) #4/0 AWG copper
