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Question 1. Which formula correctly represents Ohm’s Law? A) V = I × R B) I = V ÷ P C) R = V × I 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, 60 Hz single-phase load draws 10 A. What is the apparent power in volt-amperes? A) 1.2 kVA B) 12 kVA C) 120 VA D) 600 VA Answer: A Explanation: Apparent power S = V × I = 120 V × 10 A = 1,200 VA = 1.2 kVA. Question 3. In a series circuit, the total resistance is 48 Ω. If three resistors of 12 Ω each are added, what is the new total resistance? A) 12 Ω B) 36 Ω C) 48 Ω D) 84 Ω Answer: D Explanation: Series resistances add: 48 Ω + 12 Ω + 12 Ω + 12 Ω = 84 Ω. Question 4. Two 6 Ω resistors are connected in parallel. What is the equivalent resistance? A) 12 Ω
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B) 6 Ω
C) 3 Ω
D) 1.5 Ω
Answer: C Explanation: 1/Req = 1/6 + 1/6 = 2/6 → Req = 3 Ω. Question 5. A motor operates at 460 V, 3 phase, 60 Hz and draws 15 A per phase. What is its three-phase apparent power? A) 10.0 kVA B) 12.0 kVA C) 15.0 kVA D) 20.0 kVA Answer: B Explanation: S = √3 × V_LL × I = 1.732 × 460 V × 15 A ≈ 11,950 VA ≈ 12 kVA. Question 6. Convert 5 kW to horsepower (HP). (1 HP = 746 W) A) 5.0 HP B) 6.7 HP C) 3.3 HP D) 0.75 HP Answer: B Explanation: 5,000 W ÷ 746 W/HP ≈ 6.7 HP. Question 7. The power factor of a load is 0.8 lagging and the apparent power is 10 kVA. What is the real power? A) 8 kW B) 12 kW C) 6.4 kW D) 10 kW
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B) #8 AWG
C) #6 AWG
D) #4 AWG
Answer: B Explanation: NEC Table 250.66 lists #8 AWG copper for 100 A service. Question 11. A 20 A branch circuit supplies lighting with a total load of 1,800 VA. What is the circuit’s demand factor? A) 0. B) 0. C) 1. D) 0. Answer: A Explanation: Demand factor = Load ÷ (Current × Voltage) = 1,800 VA ÷ (20 A × 120 V) = 1,800 ÷ 2,400 = 0.75. Question 12. Which type of conduit is permitted for direct burial without a raceway? A) EMT B) RMC C) PVC Schedule 40 D) Flexible metal conduit Answer: C Explanation: PVC Schedule 40 conduit is listed for direct burial. Question 13. The NEC requires a minimum of how many conductors in a raceway for a 120/240 V single-phase feeder with a neutral? A) 2 B) 3 C) 4
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D) 5
Answer: C Explanation: Two hot conductors, one neutral, and one equipment grounding conductor = 4 conductors. Question 14. When derating conduit fill to 40 % for more than three current-carrying conductors, which NEC table is used? A) Table 310.15(B)(16) B) Table 310. C) Table 310.15(B)(3)(a) D) Table 310. Answer: C Explanation: Table 310.15(B)(3)(a) provides adjustment factors for more than three current-carrying conductors. Question 15. A 240 V motor rated 5 HP, 90 % efficient, requires a branch-circuit overcurrent protective device. What is the minimum rating of the breaker? (Use NEC 430.22) A) 25 A B) 30 A C) 35 A D) 40 A Answer: B Explanation: Full-load current (FLC) = (HP × 746) ÷ (Voltage × Efficiency) = (5×746)/(240×0.9)= 17.3 A. NEC 430.22 permits 125 % of FLC = 21.6 A, next standard size is 25 A, but for motors 125 % of FLC is used for OCPD, giving 22 A, next standard size is 25 A. However, the answer option B (30 A) may be considered if the next standard size above 25 A is selected for safety. The correct answer is 25 A, but since 25 A is not listed, the nearest higher standard size is 30 A. Corrected Answer: B Explanation: The calculated OCPD is 22 A; the next standard breaker size is 30 A.
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D) 600 V
Answer: B Explanation: V_L-N = V_L-L ÷ √3 = 480 V ÷ 1.732 ≈ 277 V. Question 19. Which of the following is NOT a permitted method for grounding a service-entrance conductor? A) Grounding electrode conductor to a concrete-encased electrode B) Directly bonding to a water pipe C) Using the neutral conductor as the grounding path D) Ground rod electrode Answer: C Explanation: The neutral cannot be used as a grounding electrode for the service-entrance conductor; a separate grounding electrode system is required. Question 20. According to NEC 250.122, what size copper equipment grounding conductor is required for a 200 A feeder? A) #8 AWG B) #6 AWG C) #4 AWG D) #2 AWG Answer: C Explanation: Table 250.122 lists #4 AWG copper for a 200 A overcurrent device. Question 21. A 30 A, 120 V circuit supplies 10 receptacles. What is the maximum allowable load per receptacle according to NEC 210.21(B)(2)? A) 1.5 A B) 1.8 A C) 2.0 A D) 2.4 A Answer: B
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Explanation: For a 30 A branch circuit, receptacle rating may not exceed 1.8 A per receptacle (80 % of 30 A ÷ 10 = 2.4 A, but NEC limits to 1.8 A for 15 A or 20 A receptacles; the correct answer is 1.8 A). Question 22. Which NEC article defines the requirements for arc-flash labeling? A) 110. B) 210. C) 300. D) 410. Answer: A Explanation: NEC 110.16 requires arc-flash hazard analysis and labeling. Question 23. When installing a conduit system in a concrete wall, what minimum concrete cover is required for PVC conduit? A) 1 in B) 1½ in C) 2 in D) 2½ in Answer: B Explanation: NEC 300.5(D) requires a minimum of 1½ in cover for PVC conduit in concrete. Question 24. The maximum allowable voltage drop for a feeder supplying a continuous load is: A) 1 % B) 2 % C) 3 % D) 5 % Answer: B
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Explanation: Rhode Island General Laws Title 5, Chapter 6 covers licensing for electricians. Question 28. A homeowner requests a permit for a new 120/240 V service upgrade. Which Rhode Island agency issues the electrical permit? A) Department of Environmental Management B) Office of the Governor C) Rhode Island Department of Labor and Training (DLT) D) Rhode Island Housing Authority Answer: C Explanation: The DLT’s Division of Professional Licensing issues electrical permits in RI. Question 29. How many continuing education (CE) hours are required for a Rhode Island master electrician license renewal every two years? A) 12 B) 16 C) 20 D) 24 Answer: B Explanation: Rhode Island requires 16 CE hours for master electricians biennially. Question 30. Which OSHA standard addresses the use of personal protective equipment (PPE) for electrical work? A) 1910. B) 1926. C) 1910. D) 1910. Answer: C Explanation: OSHA 1910.333 specifically covers electrical PPE.
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Question 31. The minimum distance between a 120/240 V service panel and a swimming pool wall, according to NEC 680.23, is: A) 3 ft B) 4 ft C) 5 ft D) 6 ft Answer: B Explanation: NEC requires a minimum 4 ft clearance between service equipment and pool walls. Question 32. For a Class I, Division 2 hazardous location, which type of conduit is permitted? A) Rigid metal conduit (RMC) only B) PVC conduit only C) Both RMC and PVC D) Flexible metal conduit only Answer: C Explanation: Both RMC and PVC are allowed in Class I, Division 2 locations when listed for the purpose. Question 33. A 15 kVA, 240 V transformer is installed in a commercial building. What is the minimum size of the equipment grounding conductor (EGC) for the secondary, per NEC 250.122? A) #12 AWG copper B) #10 AWG copper C) #8 AWG copper D) #6 AWG copper Answer: B Explanation: The secondary overcurrent device is typically 25 A; Table 250.122 calls for #10 AWG copper for 25 A.
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Question 37. What is the maximum number of conductors allowed in a 1/2-in. EMT conduit without derating, assuming all are current-carrying? A) 5 B) 7 C) 9 D) 11 Answer: B Explanation: NEC Chapter 9, Table 1 gives fill limits; for 1/2-in. EMT, up to 7 # conductors can be installed before derating is required. Question 38. In a healthcare facility, which NEC article governs the “essential electrical systems” that must remain operational during a power outage? A) 517 B) 700 C) 517. D) 517. Answer: D Explanation: NEC 517.2 defines essential electrical systems in health care facilities. Question 39. A 250 V, 3-phase motor has a locked-rotor current (LRC) of 120 A. What is the maximum size of a fuse that may be used for short-circuit protection per NEC 430.32? A) 150 A B) 200 A C) 300 A D) 400 A Answer: B Explanation: NEC permits a fuse up to 250 % of LRC: 120 A × 2.5 = 300 A; the next standard size below 300 A is 250 A, but 200 A also meets the requirement; however the maximum allowed is 300 A. Since 300 A is an option, the correct answer is C.
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Corrected Answer: C Explanation: 120 A × 2.5 = 300 A, so a 300 A fuse is the maximum permissible. Question 40. Which NEC chapter contains the requirements for “electrical installations in temporary structures”? A) Chapter 2 B) Chapter 3 C) Chapter 4 D) Chapter 5 Answer: C Explanation: NEC Chapter 4 addresses temporary installations. Question 41. A fire pump requires a dedicated 125 % rated circuit. The pump draws 30 A at 460 V. What is the minimum breaker size? A) 35 A B) 40 A C) 45 A D) 50 A Answer: B Explanation: 125 % of 30 A = 37.5 A; the next standard breaker size is 40 A. Question 42. For a 3-wire 120/240 V branch circuit feeding a kitchen range, what is the required size of the equipment grounding conductor if the overcurrent device is 50 A? A) #12 AWG copper B) #10 AWG copper C) #8 AWG copper D) #6 AWG copper Answer: B
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Explanation: The dryer draws 12.5 A; per NEC Table 310.16, #12 AWG copper is rated for 20 A at 60 °C, sufficient for the neutral. Question 46. Which NEC article specifies the requirements for “ground-fault circuit interrupters (GFCIs) in residential garages”? A) 210.8(A)(2) B) 210.8(B)(1) C) 210.9(A) D) 210.10(B) Answer: A Explanation: NEC 210.8(A)(2) mandates GFCI protection for garage receptacles. Question 47. In a commercial building, a dedicated 20 A circuit supplies a wall-mounted air-conditioner. What is the minimum conduit fill percentage allowed for this circuit? A) 20 % B) 30 % C) 40 % D) 53 % Answer: D Explanation: NEC permits up to 53 % fill for a single conductor in a conduit. Question 48. Which NEC chapter addresses “electrical installations in marine vessels”? A) Chapter 7 B) Chapter 8 C) Chapter 9 D) Chapter 10 Answer: D Explanation: Chapter 10 of the NEC covers marine and boat installations.
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Question 49. A 250 kVA transformer has a primary voltage of 13.8 kV and a secondary voltage of 480 V. What is the full-load secondary current? A) 300 A B) 400 A C) 500 A D) 600 A Answer: B Explanation: I = (kVA × 1000) ÷ (√3 × V) = (250,000) ÷ (1.732 × 480) ≈ 300 A. Wait calculation: 250,000 VA ÷ (1.732×480) = 250,000 ÷ 831 ≈ 300 A. The correct answer is A (300 A). Corrected Answer: A Explanation: Full-load secondary current = 250,000 VA ÷ (√3 × 480 V) ≈ 300 A. Question 50. Which NEC article governs the installation of “low-voltage lighting control circuits” (under 30 V)? A) 210. B) 300. C) 410. D) 725 Answer: D Explanation: NEC Article 725 covers Class 2 and Class 3 circuits, including low-voltage lighting controls. Question 51. For a 120 V, 20 A receptacle circuit, what is the maximum length of flexible cord permitted without a listed connector? A) 6 ft B) 12 ft C) 18 ft
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Answer: C Explanation: NEC Table 250.66 lists #1/0 AWG copper for a 400 A service. Question 55. Which NEC article specifies the requirements for “electric vehicle charging equipment”? A) 625 B) 630 C) 640 D) 690 Answer: D Explanation: NEC Article 690 covers solar photovoltaic and electric vehicle charging systems. Question 56. A 100 A feeder supplies a panel with a demand load of 45 kVA at 240 V. What is the percent load on the feeder? A) 45 % B) 75 % C) 93.75 % D) 100 % Answer: C Explanation: Load current = 45,000 VA ÷ 240 V = 187.5 A. Percent load = 187.5 A ÷ 100 A = 187.5 %—which exceeds the feeder rating, indicating an overload. However the question asks for percent load relative to the feeder rating, which is 187.5 %. Since 187.5 % is not an option, the nearest provided answer is 93.75 % (which would correspond to a 200 A feeder). The question is flawed. Corrected Question: A 200 A feeder supplies a panel with a demand load of 45 kVA at 240 V. What is the percent load on the feeder? Corrected Answer: C Explanation: Load current = 45,000 VA ÷ 240 V = 187.5 A. Percent load = 187.5 A ÷ 200 A = 93.75 %.
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Question 57. Which NEC article addresses the installation of “circuit interrupters for personnel protection” (i.e., AFCI)? A) 210. B) 210. C) 210. D) 210. Answer: A Explanation: NEC 210.12 requires AFCI protection for dwelling unit branch circuits. Question 58. In a residential dwelling, what is the minimum size of a feeder conductor for a 60 A subpanel using copper conductors with 75 °C rating? A) #6 AWG B) #4 AWG C) #2 AWG D) #1/0 AWG Answer: B Explanation: Table 310.16 shows #4 AWG copper rated for 70 A at 75 °C; the next size up #3 AWG is not standard, so #4 AWG is used for 60 A feeder. Question 59. Which NEC section requires that all receptacles in a dwelling be installed at a height not exceeding 1.5 m (5 ft) above the floor? A) 210.52(C) B) 210.52(E) C) 210.52(F) D) None of the above Answer: D Explanation: NEC does not prescribe a maximum height for receptacles; the requirement is a minimum of 12 in. above the floor. Question 60. The NEC permits the use of “metallic conduit as an equipment grounding conductor” under which condition?
