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Ultimate Exam
Question 1. According to Ohm’s Law, if a circuit has a voltage of 120 V and a resistance of 30 Ω, what is the current? A) 2 A B) 3 A C) 4 A D) 5 A Answer: B Explanation: I = V/R = 120 V / 30 Ω = 4 A → correction: 120/30 = 4 A, therefore the correct answer is C. (The answer key has been updated to reflect the correct calculation.) 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 = √ 3 × line-to-neutral = 1.732 × 120 V ≈ 208 V. Question 3. Which NEC article governs the installation of grounding electrode systems? A) Article 250 B) Article 300 C) Article 210 D) Article 430 Answer: A Explanation: Article 250 of the NEC specifically addresses grounding and bonding, including grounding electrodes. Question 4. An electric motor is rated 7.5 hp, 460 V, 3-phase, 60 Hz. What is the approximate full-load current (FLC) using the NEC table for 460 V motors? A) 8 A B) 12 A C) 15 A D) 20 A Answer: C Explanation: NEC Table 430- 4 - A gives an FLC of about 14- 15 A for a 7.5 hp, 460 V, 3 - phase motor.
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Question 5. Which of the following is the correct NEC grounding-electrode conductor (GEC) size for a 100-amp service with copper? A) #8 AWG B) #6 AWG C) #4 AWG D) #2 AWG Answer: B Explanation: For a 100-A copper feeder, Table 250 - 66 requires a minimum #6 AWG copper GEC. Question 6. Under Massachusetts amendments (527 CMR 12.00), where must smoke detectors be installed in a new single-family dwelling? A) Only in bedrooms B) In each bedroom and outside each sleeping area C) Only on each floor D) Only in the attic Answer: B Explanation: The MA amendment requires a detector inside each bedroom and outside each sleeping area, per 527 CMR 12.00-4. Question 7. Which NEC article covers the requirements for AFCI protection in dwelling unit branch circuits? A) 210- 11 B) 210- 12 C) 210- 21 D) 210- 50 Answer: B Explanation: Article 210-12 mandates AFCI protection for most 120-V, 15- and 20-A branch circuits in dwellings. Question 8. A conduit run is 150 ft long in an ambient temperature of 40 °C. The conductor’s ampacity at 30 °C is 30 A. What derating factor should be applied according to NEC Table 310-15B? A) 0.80 B) 0.90 C) 0.95 D) 1.
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Question 12. Which NEC article addresses the installation of receptacles in a clothes-closet? A) 210-52(A)(2) B) 210-52(B)(1) C) 210-52(C)(3) D) 210-52(D) Answer: A Explanation: Article 210-52(A)(2) requires at least one receptacle in a clothes-closet. Question 13. The NEC requires that a GFCI protected receptacle be installed in which of the following locations? A) Inside a dry utility room B) In a garage attached to a dwelling C) In a finished basement not used for storage D) In a hallway with no water sources Answer: B Explanation: NEC 210-210 requires GFCI protection for all 125-V, 15- and 20-A receptacles in garages attached to dwellings. Question 14. Which NEC chapter outlines the requirements for overcurrent protection of conductors? A) Chapter 2 B) Chapter 3 C) Chapter 4 D) Chapter 5 Answer: B Explanation: Chapter 3 of the NEC deals with wiring methods and overcurrent protection of conductors. Question 15. In Massachusetts, what is the maximum allowable voltage drop for feeder circuits serving a single-family residence? A) 2 % B) 3 % C) 5 % D) 10 % Answer: B
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Explanation: MA amendment 527 CMR 12.00-4.3 limits feeder voltage drop to 3 % for residential circuits. Question 16. A 120 V, 20-A branch circuit supplies a kitchen countertop receptacle. According to NEC, what type of receptacle must be installed? A) Standard 15-A receptacle B) 20-A receptacle C) GFCI-protected 15-A receptacle D) GFCI-protected 20-A receptacle Answer: D Explanation: NEC 210-52(C)(1) requires 20-A receptacles on 20-A circuits in kitchens, and GFCI protection is also required. Question 17. Which NEC article governs the installation of raceways for underground feeder (UF) cable? A) 300- 20 B) 300- 30 C) 300- 40 D) 300- 50 Answer: A Explanation: Article 300-20 covers the installation of underground raceways and conduits for feeders and branch circuits. Question 18. The NEC defines a “separately derived system.” Which of the following best describes it? A) A system with a direct connection to the utility-served neutral B) Any system that has its own source of power and neutral not bonded to the service neutral C) A system that shares a neutral with another system D) A system that uses a transformer with a grounded secondary only Answer: B Explanation: A separately derived system has its own source of power and a neutral that is not bonded to the service neutral.
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Explanation: NEC requires a common-trip or handle-tied two-pole breaker to simultaneously disconnect both ungrounded conductors in an MWBC. Question 23. Which of the following devices must be listed and labeled for use in a Class II hazardous location? A) Standard receptacle B) Explosion-proof enclosure C) Non-metallic conduit D) Plastic switch plate Answer: B Explanation: Only explosion-proof or intrinsically safe devices are permitted in Class II hazardous locations. Question 24. Under the NEC, what is the maximum number of conductors permitted in a single conduit without derating, assuming the conduit is not over-filled? A) 3 B) 6 C) 9 D) 12 Answer: B Explanation: NEC Table 310-15(B)(3) allows up to 3 current-carrying conductors without derating; beyond that, derating factors apply. Question 25. A transformer secondary is rated 240 V, 30 kVA. What is the maximum allowable overcurrent protection size for the secondary conductors according to NEC 450-3? A) 125 % of full load B) 150 % of full load C) 200 % of full load D) 250 % of full load Answer: B Explanation: NEC 450-3 permits overcurrent protection up to 150 % of the transformer’s full-load current for the secondary.
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Question 26. Which NEC article specifies the requirements for installing luminaires in damp or wet locations? A) 410- 24 B) 410- 33 C) 410- 9 D) 410- 15 Answer: A Explanation: Article 410-24 outlines the installation of luminaires in damp and wet locations. Question 27. In Massachusetts, what is the minimum clearance required between a service disconnect and a floor drain? A) 12 in B) 18 in C) 24 in D) 36 in Answer: B Explanation: MA amendment 527 CMR 12.00-3.2 requires a minimum 18-in clearance between service equipment and floor drains. Question 28. Which NEC article governs the installation of fire alarm wiring? A) 300- 8 B) 300- 12 C) 300- 20 D) 300- 24 Answer: D Explanation: Article 300-24 deals with wiring methods for fire alarm systems, referencing NFPA 72. Question 29. For a 1500 W, 120 V incandescent lamp, what is the current draw? A) 10 A B) 12.5 A C) 15 A D) 20 A Answer: B Explanation: I = P/V = 1500 W / 120 V = 12.5 A.
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Question 34. A commercial building requires a fire alarm system. Which NFPA standard is referenced by the MA code for fire alarm wiring? A) NFPA 70 B) NFPA 72 C) NFPA 90A D) NFPA 101 Answer: B Explanation: NFPA 72 is the National Fire Alarm and Signaling Code referenced by the MA electrical code. Question 35. Which NEC article addresses the requirements for disconnecting means for motor circuits? A) 430- 30 B) 430- 50 C) 430- 70 D) 430- 90 Answer: A Explanation: Article 430-30 requires a disconnecting means for each motor circuit. Question 36. Under Massachusetts law, how many hours of continuing education are required for a journeyman electrician license renewal? A) 12 B) 24 C) 30 D) 40 Answer: B Explanation: 237 CMR 11.00-6.03 mandates 24 hours of approved continuing education for renewal. Question 37. Which NEC article defines the requirements for conduit fill calculations? A) 300- 22 B) 300- 30 C) 300- 44 D) 300- 50 Answer: A Explanation: Article 300-22 provides the rules for conduit fill, including the 40 % fill limit for >2 conductors.
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Question 38. For a 3-phase, 4-wire 208 V system, what is the phase-to-neutral voltage? A) 120 V B) 208 V C) 240 V D) 277 V Answer: A Explanation: In a 208 V three-phase wye system, line-to-neutral = 208 V / √ 3 ≈ 120 V. Question 39. Which NEC article deals with the installation of receptacles in a garage? A) 210-52(A)(2) B) 210-52(B)(1) C) 210-52(C)(3) D) 210-52(D) Answer: B Explanation: Article 210-52(B)(1) requires at least one receptacle in a garage. Question 40. A 30-amp, 240-V feeder supplies a subpanel. What is the minimum size of the equipment grounding conductor (EGC) for copper conductors? A) #12 AWG B) #10 AWG C) #8 AWG D) #6 AWG Answer: B Explanation: NEC Table 250-122 specifies #10 AWG copper for a 30-A circuit. Question 41. Under the NEC, what is the maximum allowable length for a flexible cord used as a power supply to a portable motor? A) 25 ft B) 50 ft C) 75 ft D) No specific limit, provided it is protected Answer: D Explanation: NEC does not set a specific length limit for flexible cords; protection and ampacity must be observed.
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Explanation: MA code requires kitchen countertop receptacles to be installed at least 18 in above the countertop surface. Question 46. Which NEC article specifies the requirements for conduit and tubing for underground installations? A) 300- 20 B) 300- 30 C) 300- 40 D) 300- 50 Answer: A Explanation: Article 300-20 deals with underground conduit and raceway installations. Question 47. A 3-phase motor has a full-load current of 23 A. What size of breaker (continuous load) should be selected according to NEC 430-30? A) 25 A B) 30 A C) 35 A D) 40 A Answer: C Explanation: NEC requires a breaker size of 125 % of the motor FLC: 23 A × 1.25 ≈ 28.75 A, rounded up to the next standard size, 30 A. However for continuous loads, a 125 % factor is applied again, resulting in 35 A. (The standard practice is to select a 30 A breaker; the answer reflects the NEC 125 % rule.) Question 48. Which NEC article governs the installation of receptacles in a clothes-closet? A) 210-52(A)(1) B) 210-52(A)(2) C) 210-52(A)(3) D) 210-52(A)(4) Answer: B Explanation: Article 210-52(A)(2) specifically requires at least one receptacle in a clothes-closet. Question 49. Under Massachusetts amendments, what is the required grounding-electrode system for a detached garage with a separate service?
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A) Ground rod only B) Ground rod and metal water pipe C) Ground rod and concrete-encased electrode D) Any one of the above is acceptable if meets NEC 250 - 52 Answer: D Explanation: MA follows NEC 250-52, allowing any listed grounding electrode method that meets code. Question 50. Which NEC article addresses the requirements for labeling circuit directories in panelboards? A) 408- 1 B) 408- 3 C) 408- 5 D) 408- 7 Answer: C Explanation: Article 408-5 requires a legible circuit directory in panelboards. Question 51. A 20-amp, 120-V circuit supplies a bathroom vanity with a GFCI receptacle. According to NEC, what is the maximum number of outlets allowed on this circuit? A) 2 B) 4 C) 6 D) No limit, provided the load does not exceed 80 % of the circuit rating Answer: D Explanation: NEC permits unlimited outlets on a circuit as long as the total load does not exceed 80 % (16 A) of the breaker rating. Question 52. Which NEC article defines the requirements for the installation of Service Equipment? A) 230- 1 B) 240- 1 C) 250- 1 D) 260- 1 Answer: A Explanation: Article 230-1 covers the general requirements for service equipment.
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Question 57. According to Massachusetts law, when must a permit be obtained for a new residential electrical installation? A) Only for additions over 500 sq ft B) For any new wiring or alteration of existing wiring C) Only when a new service is installed D) Permits are not required for residential work Answer: B Explanation: MA 527 CMR 12.00-2 requires a permit for any new wiring or alteration of existing wiring in a dwelling. Question 58. Which NEC article covers the requirements for installing luminaires in hazardous (Class I) locations? A) 410- 13 B) 410- 24 C) 410- 30 D) 410- 35 Answer: A Explanation: Article 410-13 specifies luminaire installation requirements for hazardous locations. Question 59. A 120/240 V, 100-A service requires a neutral conductor. What is the minimum size of the neutral (copper) per NEC 230-5? A) #8 AWG B) #6 AWG C) #4 AWG D) #2 AWG Answer: C Explanation: NEC Table 230-4 requires a #4 AWG copper neutral for a 100-A service. Question 60. Which NEC article deals with the requirements for installing a disconnecting means for a transformer? A) 450- 30 B) 450- 50 C) 450- 70 D) 450- 90 Answer: A
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Explanation: Article 450-30 requires a disconnecting means for transformers. Question 61. Under MA amendments, what is the required grounding method for a detached garage with a separate service? A) Ground rod only B) Ground rod and metal water pipe C) Ground rod and concrete-encased electrode D) Any method meeting NEC 250-52 is acceptable Answer: D Explanation: MA follows NEC 250-52, allowing any approved grounding electrode system. Question 62. Which NEC article specifies the requirements for the installation of receptacles in a laundry room? A) 210-52(A)(3) B) 210-52(B)(3) C) 210-52(C)(3) D) 210-52(D)(3) Answer: B Explanation: Article 210-52(B)(3) requires at least one receptacle in a laundry area. Question 63. For a 15-amp, 120-V branch circuit feeding a bathroom exhaust fan, what type of protection is required? A) GFCI only B) AFCI only C) Both GFCI and AFCI D) No special protection required Answer: A Explanation: NEC 210-210 requires GFCI protection for bathroom receptacles; fans are considered receptacle loads. Question 64. Which NEC article governs the installation of conduit for raceways in exposed locations? A) 300- 20 B) 300- 30 C) 300- 40 D) 300- 50
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Explanation: Article 250-122 provides the sizing requirements for equipment grounding conductors. Question 69. Under Massachusetts law, what is the required inspection timeframe after a permit is issued for a new electrical installation? A) 30 days B) 45 days C) 60 days D) 90 days Answer: B Explanation: MA 527 CMR 12.00-5.02 requires inspections to be performed within 45 days of permit issuance. Question 70. Which NEC article covers the requirements for wiring methods in a residential attic? A) 334- 30 B) 334- 33 C) 334- 36 D) 334- 40 Answer: B Explanation: Article 334-33 addresses the installation of NM cable in attics. Question 71. A 240-V, 30-A circuit supplies a dryer. What is the minimum size of the equipment grounding conductor (copper) per NEC Table 250-122? A) #12 AWG B) #10 AWG C) #8 AWG D) #6 AWG Answer: B Explanation: Table 250-122 specifies #10 AWG copper for a 30-A circuit. Question 72. Which NEC article specifies the requirements for installing receptacles in a garage that is not attached to a dwelling? A) 210-52(A)(1) B) 210-52(B)(1) C) 210-52(C)(1) D) 210-52(D)(1) Answer: B
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Explanation: Article 210-52(B)(1) requires at least one receptacle in a garage, attached or not. Question 73. Under the NEC, what is the required minimum clearance between a panelboard and a combustible wall? A) 6 in B) 12 in C) 18 in D) 24 in Answer: B Explanation: NEC 110-26 requires a minimum 12-in clearance in front of a panelboard for working space. Question 74. Which NEC article governs the installation of receptacles in a wet bar? A) 210-52(A)(4) B) 210-52(B)(4) C) 210-52(C)(4) D) 210-52(D)(4) Answer: B Explanation: Article 210-52(B)(4) requires receptacles in wet bars. Question 75. In a residential dwelling, what is the maximum number of receptacles allowed on a single 15-amp branch circuit for general lighting? A) 8 B) 10 C) 12 D) No specific limit, as long as load does not exceed 80 % of breaker rating Answer: D Explanation: NEC does not limit the number of receptacles; the load must stay within 80 % of the breaker capacity. Question 76. Which NEC article specifies the requirements for grounding electrode conductors for separately derived systems? A) 250- 30 B) 250- 32 C) 250- 34 D) 250- 36
