Download PrepIQ Utah UT RJEME Residential Journeyman Electrician Ultimate Exam and more Exams Technology in PDF only on Docsity!
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Question 1. What is the voltage drop (in volts) across a 100-ft copper conductor with a resistance of 0.2 Ω per 100 ft when carrying 15 A of current? A) 0.3 V B) 1.5 V C) 3.0 V D) 30 V Answer: C Explanation: Voltage drop = I × R = 15 A × 0.2 Ω = 3.0 V. Question 2. According to NEC Article 100, which term defines “the point where the grounding electrode system is connected to the grounding conductor of the service”? A) Bonding Jumper B) Grounding Electrode Conductor C) Intersystem Bonding Termination D) Service Grounding Terminal Answer: C Explanation: “Intersystem Bonding Termination” is the defined location where the grounding electrode system ties to the service grounding conductor. Question 3. In a series circuit of three resistors (10 Ω, 20 Ω, 30 Ω) connected to a 120 V source, what is the current through the circuit? A) 0.5 A B) 1 A C) 2 A D) 4 A Answer: A Explanation: Total resistance = 60 Ω; I = V/R = 120 V / 60 Ω = 2 A. (Correction: 120 V/60 Ω = 2 A, but answer choice A is 0.5 A. Actually the correct answer should be 2 A, which is choice C.) Correct Answer: C Explanation: Total resistance 60 Ω, current = 120 V ÷ 60 Ω = 2 A.
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Question 4. Which NEC article specifically governs the installation of receptacles in residential kitchens? A) Article 210. B) Article 210.8(A)(6) C) Article 210.11(C)(1) D) Article 210. Answer: A Explanation: Article 210.52 details the required number and placement of receptacle outlets in kitchens. Question 5. A 240-V dryer requires a 30-A branch circuit. What minimum conductor size (copper) is permitted by NEC Table 310.15(B)(16) for this load, assuming 75 °C insulation? A) 10 AWG B) 8 AWG C) 6 AWG D) 4 AWG Answer: B Explanation: For a 30-A continuous load, 125 % = 37.5 A. Table 310.15(B)(16) shows 8 AWG copper at 50 A (75 °C), satisfying the requirement. Question 6. Which of the following devices provides protection against both series and parallel arc-faults in residential circuits? A) GFCI B) AFCI C) Surge Protector D) Circuit Breaker with Ground Fault Protection Answer: B Explanation: Arc-Fault Circuit Interrupters (AFCIs) detect both series and parallel arcing conditions. Question 7. In Utah, the “Utah Residential Electrical Code” incorporates which edition of the NEC as its base?
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C) Article 352 D) Article 376 Answer: A Explanation: Article 334 covers Non-Metallic Sheathed Cable, including UF cable. Question 11. For a 120-V lighting circuit with a total load of 1800 W, what is the minimum rating of the circuit breaker required? A) 10 A B) 15 A C) 20 A D) 30 A Answer: B Explanation: Current = P/V = 1800 W / 120 V = 15 A. A 15-A breaker is the minimum rating. Question 12. In a three-wire 120/240-V service, the neutral conductor must be identified with which color? A) White or gray B) Green or bare C) Black or red D) Blue or orange Answer: A Explanation: NEC requires neutral conductors to be white or gray. Question 13. Which of the following is NOT a permissible location for a receptacle in a bathroom according to NEC 2020? A) Within the bathtub B) Within 3 ft of the sink faucet C) Inside a vanity cabinet D) On the wall adjacent to the shower stall Answer: A
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Explanation: Receptacles are prohibited inside the bathtub or shower stall interior. Question 14. The NEC defines “continuous load” as a load that ... A) Operates for more than three hours per day B) Operates at full rating for 24 hours C) Operates for at least three hours or more each day D) Operates intermittently throughout the day Answer: C Explanation: A continuous load is one expected to run for three hours or more continuously. Question 15. A 1500-W electric water heater operates on a 240-V circuit. What is the appropriate breaker size? A) 10 A B) 15 A C) 20 A D) 30 A Answer: C Explanation: Current = 1500 W / 240 V = 6.25 A. NEC requires 125 % for continuous loads: 6.25 A × 1.25 = 7.8 A → minimum 15 A breaker. However, water heaters are considered non-continuous, so a 15 A breaker is acceptable. The smallest standard size above 7.8 A is 15 A. Correct Answer: B Explanation: Since the water heater is not a continuous load, a 15 A breaker is sufficient. Question 16. Which NEC article addresses the grounding electrode system for residential structures? A) Article 250. B) Article 250. C) Article 250. D) Article 250.
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Question 20. Which of the following is the correct method for calculating box fill for a device box containing two single-pole switches and a grounding conductor? A) Count each conductor as one volume unit, and the device as two units. B) Count each conductor as one unit, the device as one unit, and add one for the ground. C) Count each conductor as one unit, the device as two units, and add one for the ground. D) Count each conductor as two units, the device as one unit, and add one for the ground. Answer: C Explanation: Each conductor that enters the box counts as one unit; a device (switch) counts as two units; the equipment grounding conductor counts as one unit. Question 21. The allowable ampacity of a 12-AWG copper conductor with 90 °C insulation is ... A) 20 A B) 25 A C) 30 A D) 35 A Answer: C Explanation: Table 310.15(B)(16) shows 12 AWG copper at 90 °C rated for 30 A. Question 22. Which NEC article governs the installation of swimming pool equipment? A) Article 680 B) Article 690 C) Article 700 D) Article 550 Answer: A Explanation: Article 680 deals with swimming pools, fountains, and similar installations.
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Question 23. A residential solar photovoltaic (PV) system must have a disconnecting means located within ... A) 5 ft of the inverter B) 10 ft of the inverter C) 25 ft of the inverter or inside the building D) No specific distance, only accessible Answer: C Explanation: NEC 690.13 requires a PV disconnect within 25 ft of the inverter or inside the building. Question 24. For a 20-A branch circuit supplying a residential kitchen countertop receptacle, which type of GFCI protection is required? A) GFCI circuit breaker only B) GFCI receptacle only C) Either a GFCI breaker or GFCI receptacle D) No GFCI required Answer: C Explanation: NEC permits either a GFCI breaker at the panel or GFCI receptacles at the outlet. Question 25. Which of the following is the correct definition of “bonding” per NEC Article 100? A) Connecting a conductor to the earth B) Connecting two conductive objects together to ensure electrical continuity C) Isolating a circuit from ground D) Providing a path for fault current back to the source Answer: B Explanation: Bonding is the practice of connecting conductive parts together to ensure a reliable electrical path. Question 26. In a residential branch circuit, the maximum number of 15-A receptacles allowed on a single circuit for general lighting is ... A) 8
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D) 6 ft Answer: C Explanation: FMC must be supported within 4 ft of each outlet box and every 4 ft thereafter. Question 30. A 120-V, 15-A receptacle is installed in a wet location. Which enclosure type is required? A) NEMA 1 B) NEMA 3R C) NEMA 4 D) NEMA 6 Answer: C Explanation: NEMA 4 enclosures are required for wet locations to protect against water ingress. Question 31. Which of the following is the correct procedure for bonding a metal water pipe to the grounding electrode system? A) Use a 6-AWG copper jumper B) Use a 10-AWG copper jumper C) Use a 12-AWG aluminum jumper D) No bonding required for water pipes Answer: B Explanation: NEC 250.104(A)(1) requires a 10-AWG copper jumper to bond metal water piping. Question 32. The NEC defines a “dedicated branch circuit” as … A) A circuit that supplies only one type of equipment B) A circuit that supplies multiple outlets in a room C) A circuit that supplies lighting only D) A circuit that must be protected by a GFCI Answer: A
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Explanation: A dedicated branch circuit supplies a single load or a specific type of equipment. Question 33. In Utah, the Construction Trades Licensing Act requires a journeyman electrician to have how many hours of on-the-job experience before applying for licensure? A) 2,000 hours B) 4,000 hours C) 6,000 hours D) 8,000 hours Answer: C Explanation: Utah requires a minimum of 6,000 documented hours of supervised work experience. Question 34. Which NEC article governs the installation of receptacles in a residential laundry area? A) Article 210.11(C)(2) B) Article 210.52(F) C) Article 210.8(A)(7) D) Article 210. Answer: B Explanation: Article 210.52(F) specifies the required receptacle outlet count for laundry areas. Question 35. A 240-V, 30-A dryer circuit uses a 10-AWG copper conductor. Is this conductor size acceptable? A) Yes, because 10 AWG is rated for 30 A at 60 °C B) No, because 10 AWG is only rated for 25 A C) Yes, because dryer circuits are exempt from ampacity tables D) No, because dryer circuits require a minimum of 8 AWG Answer: A Explanation: 10 AWG copper is rated for 30 A at 60 °C, which meets the dryer’s requirement.
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A) Never; neutral and ground must always be separate. B) Only if the service disconnect is located outdoors. C) Only at the service equipment where the neutral and ground are bonded. D) Only in a mobile home. Answer: C Explanation: NEC allows the neutral to serve as ground only at the service equipment where the neutral-ground bond is made. Question 40. Which NEC article specifies the minimum clearances for overhead service conductors? A) Article 230 B) Article 250 C) Article 310 D) Article 690 Answer: A Explanation: Article 230 covers services, including clearances for overhead conductors. Question 41. In a residential installation, a 12-AWG THHN conductor is used for a 20 - A branch circuit. What is the minimum allowable temperature rating of the insulation? A) 60 °C B) 75 °C C) 90 °C D) 105 °C Answer: B Explanation: 12-AWG THHN is typically rated for 90 °C, but the terminations are limited to 60 °C or 75 °C depending on equipment; 75 °C is the common minimum for residential. Question 42. Which of the following is required for a grounding electrode system that uses a concrete-encased electrode (“Ufer”) in Utah? A) Minimum depth of 12 in below grade
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B) Minimum of 20 ft of #4 rebar C) Use of a copper conductor only D) Must be exposed above grade for inspection Answer: B Explanation: A Ufer ground requires at least 20 ft of #4 rebar or equivalent, encased in concrete. Question 43. A 15-A, 120-V kitchen receptacle is required to be GFCI protected. Which device can satisfy this requirement without replacing the receptacle? A) AFCI breaker B) GFCI breaker at the panel C) Surge protector D) Standard circuit breaker Answer: B Explanation: A GFCI breaker provides protection for all downstream receptacles on the circuit. Question 44. Which NEC article addresses the requirements for electric vehicle (EV) charging equipment in residential dwellings? A) Article 625 B) Article 690 C) Article 710 D) Article 770 Answer: A Explanation: Article 625 deals with electric vehicle charging systems. Question 45. The maximum number of 14-AWG conductors allowed in a single conduit (PVC, 1/2-in) is ... A) 8 B) 10 C) 12 D) 14
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Question 49. Which NEC article governs the installation of low-voltage lighting (under 30 V) in residential settings? A) Article 410 B) Article 725 C) Article 770 D) Article 800 Answer: A Explanation: Article 410 covers luminaires and lighting fixtures, including low-voltage installations. Question 50. The NEC requires a disconnecting means for a residential PV system to be located within sight of the PV array or ... A) Within 5 ft of the inverter B) Not more than 50 ft from the array C) Within the building containing the inverter D) Anywhere as long as it is readily accessible Answer: C Explanation: NEC 690.13 allows the disconnect to be inside the building containing the inverter, provided it is readily accessible. Question 51. For a 120-V, 2-pole circuit breaker protecting a 30-A dryer, what is the required minimum size of the equipment grounding conductor? A) 14 AWG copper B) 12 AWG copper C) 10 AWG copper D) 8 AWG copper Answer: B Explanation: Table 250.122 calls for a 12 AWG copper EGC for a 30-A overcurrent device.
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Question 52. Which of the following is the correct definition of “dead-front” as per NEC Article 100? A) A panel cover that conceals all live parts B) A metal enclosure for a transformer C) A recessed area behind a switch plate D) A conduit fitting with a gasket Answer: A Explanation: “Dead-front” refers to a barrier that prevents exposure to live parts. Question 53. In a residential wiring system, the maximum number of conductors allowed in a single 3/4-in EMT conduit is ... A) 15 B) 20 C) 25 D) 30 Answer: B Explanation: According to Table 5, 3/4-in EMT can accommodate 20 conductors of 14 - AWG (40 % fill). Larger conductors reduce the count. Question 54. Which of the following devices must be installed on all 125-V, single-phase, 15- and 20-A receptacle outlets in a dwelling’s attached garage? A) AFCI B) GFCI C) Surge protector D) Arc-fault circuit interrupter with GFCI function Answer: B Explanation: NEC 2020 requires GFCI protection for all garage receptacles. Question 55. The NEC permits the use of aluminum conductors for branch circuits if they are marked with which identification? A) “AL” stamped on the insulation B) “CU” stamped on the insulation
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Explanation: Aluminum water pipe is not an acceptable grounding electrode material. Question 59. In a residential dwelling, the minimum number of AFCI-protected circuits required by NEC 2020 is ... A) All 120-V branch circuits B) Only bedroom circuits C) All 15- and 20-A circuits supplying outlets in living areas D) Only circuits serving kitchens and bathrooms Answer: C Explanation: NEC 2020 requires AFCI protection for all 120-V, 15- and 20-A circuits supplying outlets in dwelling unit living areas. Question 60. Which NEC article provides the requirements for the installation of smoke alarm circuits? A) Article 210. B) Article 300. C) Article 410. D) Article 760. Answer: A Explanation: Article 210.12 outlines requirements for smoke alarm circuits. Question 61. A 1500-W electric space heater is plugged into a 15-A circuit. Is the circuit adequately sized? A) Yes, because the heater draws 12.5 A B) No, because the heater draws 15 A and must be on a 20-A circuit C) Yes, because the heater is a non-continuous load D) No, because any heater must be on a dedicated 20-A circuit Answer: A Explanation: Current = 1500 W / 120 V = 12.5 A, which is within the 15-A rating.
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Question 62. Which of the following is the correct method for bonding a metal conduit that serves as an equipment grounding conductor? A) Attach a bonding jumper to the conduit at each end B) Use a bonding screw in each outlet box where the conduit enters C) No bonding is required if the conduit is metal D) Bond only at the service equipment Answer: B Explanation: NEC requires bonding at each point the conduit enters a box using a bonding screw or clamp. Question 63. In a residential panel, the main disconnect must be rated for at least ... A) The sum of all branch circuit ratings B) The calculated service load plus 25 % C) The largest feeder rating entering the panel D) The service entrance rating Answer: D Explanation: The main disconnect must be rated for the service entrance rating. Question 64. Which of the following is the correct definition of “ampacity” as per NEC? A) The maximum voltage a conductor can carry B) The maximum current a conductor can safely carry under specified conditions C) The resistance of a conductor per foot D) The power factor of a load Answer: B Explanation: Ampacity is the allowable current-carrying capacity of a conductor. Question 65. According to NEC, a receptacle in a bathroom must be GFCI protected and be installed ... A) No more than 6 ft from the bathtub edge B) At least 3 ft above the floor
