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Course Exam
Question 1. Which formula correctly represents Ohm’s Law for a DC circuit? A) P = V × I B) V = I ÷ R C) I = V ÷ R D) R = P ÷ I Answer: C Explanation: Ohm’s Law states that current (I) equals voltage (V) divided by resistance (R). Question 2. In a three‑phase, 4‑wire wye system, the line‑to‑neutral voltage is 120 V. What is the line‑to‑line voltage? A) 120 V B) 208 V C) 240 V D) 277 V Answer: B Explanation: Line‑to‑line voltage = √ 3 × line‑to‑neutral → √ 3 × 120 ≈ 208 V. Question 3. A circuit has a voltage drop of 3 V over a 150‑ft copper conductor carrying 15 A. What is the approximate resistance of the conductor? A) 0.013 Ω
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B) 0.020 Ω
C) 0.030 Ω
D) 0.040 Ω
Answer: A Explanation: R = V/I = 3 V ÷ 15 A = 0.2 Ω; over 150 ft, resistance per foot = 0.2 Ω ÷ 150 ft = 0.00133 Ω/ft ≈ 0.013 Ω for the round‑trip. Question 4. Which NEC article defines the term “accessible”? A) 100 B) 110 C) 210 D) 250 Answer: A Explanation: Article 100 provides definitions, including “accessible”. Question 5. According to NEC 250.52(A)(1), the minimum size of a grounding electrode conductor (GEC) for a 100‑A service is: A) #10 AWG copper B) #8 AWG copper C) #6 AWG copper D) #4 AWG copper
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Question 8. In a residential wiring diagram, the symbol “⏚” most commonly represents: A) Receptacle B) Switch C) Light fixture D) Ground Answer: A Explanation: The “⏚” symbol denotes a receptacle (outlet). Question 9. What is the minimum height above the floor for a receptacle in a kitchen countertop area? A) 12 in. B) 15 in. C) 18 in. D) 24 in. Answer: C Explanation: NEC 210.52(C)(1) requires receptacles no more than 24 in. above the countertop, with the bottom at least 15 in.; the typical mounting is 18 in.
Course Exam
Question 10. Which type of conduit is permitted for outdoor use without a raceway? A) EMT B) RMC C) IMC D) PVC Answer: D Explanation: PVC conduit (non‑metallic) is rated for wet locations and can be used outdoors without a raceway. Question 11. The ampacity of a #4 AWG copper conductor in 75 °C insulation, ambient 30 °C, is: A) 55 A B) 70 A C) 85 A D) 95 A Answer: C Explanation: Table 310.15(B)(16) lists 85 A for #4 AWG copper at 75 °C. Question 12. For a 20‑A branch circuit supplying receptacles in a dwelling, the maximum number of receptacles allowed is: A) 10
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D) The panel is not permitted for residential service. Answer: B Explanation: MLO panels have no internal main breaker; they rely on an upstream disconnect. Question 15. A 30‑A GFCI protected circuit must be protected by a breaker of what minimum rating? A) 30 A B) 35 A C) 40 A D) 50 A Answer: A Explanation: GFCI devices are rated for the same ampere as the circuit they protect; a 30‑A GFCI requires a 30‑A breaker. Question 16. Which of the following is a requirement for a fire alarm system’s wiring according to NEC 760? A) All conductors must be in a metal conduit. B) Only copper conductors are permitted. C) A dedicated fire alarm circuit must be provided. D) The wiring must be rated for 600 V. Answer: C
Course Exam
Explanation: NEC 760.41 requires a dedicated fire alarm circuit. Question 17. The minimum size of a grounding electrode conductor (GEC) for a 400‑A service using copper is: A) #4 AWG B) #2 AWG C) #1/0 AWG D) #3/0 AWG Answer: C Explanation: Table 250.66 specifies #1/0 AWG copper for 400 A. Question 18. Which of the following is considered a “listed” product? A) A device tested and approved by a recognized testing agency. B) A homemade wiring harness. C) A product with a “UL” logo but no listing file. D) Any equipment installed in a commercial building. Answer: A Explanation: “Listed” means the product has been evaluated and approved by a recognized testing organization (e.g., UL, ETL).
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B) 705
C) 710
D) 720
Answer: A Explanation: NEC Article 690 covers PV systems. Question 22. In Montana, the minimum age to obtain a journeyman electrician license is: A) 18 years B) 19 years C) 21 years D) No age requirement, only experience. Answer: A Explanation: Montana Code requires applicants to be at least 18 years old. Question 23. A “continuous load” as defined by NEC is: A) Any load that operates for more than 3 hours per day. B) A load that runs for at least 8 hours continuously. C) Any load that is not a motor. D) A load that is switched on and off frequently.
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Answer: B Explanation: NEC defines continuous load as one that operates for three hours or more continuously. Question 24. The minimum clearance required in front of a panelboard for working space is: A) 24 in. B) 30 in. C) 36 in. D) 48 in. Answer: C Explanation: NEC 110.26(A)(1) requires a minimum of 36 in. of clear working space. Question 25. Which of the following is the correct method for sizing a feeder based on demand factors for a dwelling? A) Use the full calculated load without any demand factor. B) Apply the 100 % demand factor for all loads. C) Apply the NEC Table 220.42 demand factors for general lighting, appliances, and HVAC. D) Use a flat 80 % factor for all feeders. Answer: C
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A) NM‑B cable B) Rigid metal conduit (RMC) C) Flexible metal conduit (FMC) D) PVC conduit only Answer: B Explanation: Rigid metal conduit is approved for Class I, Division 2 locations. Question 29. The “grounded conductor” in a residential service is commonly referred to as: A) Neutral B) Ground C) Hot D) Equipment ground Answer: A Explanation: The grounded conductor carries return current and is identified as the neutral. Question 30. Which of the following devices must be installed in all 125‑V, 15 ‑ and 20‑A receptacle outlets in a residential bathroom? A) AFCI B) GFCI
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C) Surge protector D) Tamper‑resistant receptacle only Answer: B Explanation: NEC 210.8(A)(1) requires GFCI protection for bathroom receptacles. Question 31. A 240‑V, single‑phase, 30‑A dryer circuit requires which minimum conductor size (copper, 75 °C)? A) #10 AWG B) #8 AWG C) #6 AWG D) #4 AWG Answer: B Explanation: Table 310.15(B)(16) shows #8 AWG copper at 75 °C is rated for 50 A; #10 AWG is only 30 A but not allowed for dryer due to 125 % rule, so #8 AWG is required. Question 32. The term “conduit fill” refers to: A) The number of devices in a box. B) The total cross‑sectional area occupied by conductors inside a raceway. C) The length of conduit used in a run. D) The amount of insulation on a wire.
Course Exam
Explanation: Montana statutes require at least 5,000 hours of supervised experience. Question 35. Which of the following is the correct definition of “accessible” per NEC 100? A) Capable of being removed or exposed without damaging the building structure. B) Visible without the use of tools. C) Mounted on the surface of a wall. D) Located within 6 ft of the floor. Answer: A Explanation: “Accessible” means capable of being reached without damaging the building or equipment. Question 36. The minimum size of a grounding electrode conductor (GEC) for a 200‑A service using aluminum is: A) #6 AWG B) #4 AWG C) #2 AWG D) #1/0 AWG Answer: C Explanation: Table 250.66 requires #2 AWG aluminum for 200 A.
Course Exam
Question 37. Which NEC article governs the installation of emergency power systems? A) 700 B) 710 C) 720 D) 730 Answer: A Explanation: Article 700 covers emergency systems. Question 38. The “neutral‑ground bond” in a residential service is typically made at: A) The main panel’s neutral bus. B) Each sub‑panel. C) The first disconnect downstream. D) Nowhere; neutral and ground are never bonded. Answer: A Explanation: The service equipment is the point where neutral and ground are bonded. Question 39. A “listed” receptacle must be installed with: A) A ground‑fault circuit interrupter.
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D) 6
Answer: C Explanation: Using Table C.2, a 1‑in. EMT has 0.304 in² internal area; 40 % = 0.122 in². #12 THHN is 0.0133 in², allowing up to 9 conductors; however NEC limits to 5 for practicality. The correct answer based on typical exam tables is 5. Question 42. Which of the following is NOT a permitted use for a flexible cord? A) Connecting a portable lamp to a receptacle. B) Running permanent wiring inside walls. C) Powering a handheld tool. D) Supplying a temporary construction site. Answer: B Explanation: Flexible cords are not permitted as permanent wiring within walls. Question 43. A 15‑A, 120‑V receptacle in a kitchen must be GFCI protected if it is: A) Within 6 ft of a sink. B) More than 6 ft from a sink. C) Only used for a refrigerator. D) Located behind a cabinet. Answer: A
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Explanation: NEC 210.8(A)(6) requires GFCI for receptacles within 6 ft of a sink. Question 44. The NEC requires that all conductors in a raceway be of the same: A) Voltage rating. B) Insulation type. C) Color. D) Ampacity. Answer: B Explanation: Article 300.3(C)(1) requires conductors of the same circuit to have the same insulation type. Question 45. Which of the following is the correct minimum clearance between a pool pump and a combustible material? A) 3 ft B) 6 ft C) 12 ft D) 18 ft Answer: B Explanation: NEC 680.23 requires a minimum of 6 ft clearance.
