Download PrepIQ South Dakota SC 531 Journeyman Electrician Ultimate Exam and more Exams Technology in PDF only on Docsity!
Journeyman Electrician Ultimate
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Question 1. What does Ohm’s Law state? A) V = I × R B) P = V × I C) I = P ÷ V D) R = V ÷ I Answer: A Explanation: Ohm’s Law defines the relationship between voltage (V), current (I) and resistance (R) as V = I × R. Question 2. 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: Using I = V ÷ R, 120 V ÷ 30 Ω = 4 A (correct answer is actually 4 A). Correction: Answer: C. Explanation: I = 120 V / 30 Ω = 4 A. Question 3. Which formula is used to calculate real power (watts) in a single-phase circuit? A) P = V × I × cos φ B) P = V × I × sin φ C) P = V² ÷ R D) P = I² × R Answer: A Explanation: Real power equals voltage times current times the power factor (cos φ). Question 4. In NEC Article 100, “readily accessible” means: A) Able to be reached without using a ladder B) Accessible after removing a cover plate
Journeyman Electrician Ultimate
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C) Accessible without removing any part of the building structure D) Accessible only to qualified persons Answer: C Explanation: “Readily accessible” is defined as capable of being reached quickly without using portable ladders, and without the need to remove obstacles. Question 5. The term “continuous load” refers to a load that: A) Operates for more than three hours continuously B) Operates at full load for at least three hours or more C) Is a motor that runs intermittently D) Is a lighting circuit that is always on Answer: B Explanation: NEC defines a continuous load as one that is expected to run for three hours or more at its maximum rating. Question 6. Which NEC article governs the labeling of electrical equipment? A) 100 B) 110 C) 210 D) 250 Answer: B Explanation: Article 110 requires equipment to be identified, marked, and listed according to the code. Question 7. A 100-A residential service entrance conductor is sized using which table? A) Table 310.15(B)(16) B) Table 250. C) Table 220. D) Table 310. Answer: A
Journeyman Electrician Ultimate
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Explanation: NEC 110.26 requires at least 30 in. wide, 36 in. deep, and a height of 6 ft. (or the height of the equipment, whichever is greater). Question 11. When installing a service drop, the minimum vertical clearance above a driveway is: A) 12 ft. B) 14 ft. C) 16 ft. D) 18 ft. Answer: B Explanation: NEC 230.24 requires a minimum of 14 ft. clearance over a public way such as a driveway. Question 12. A grounding electrode conductor (GEC) for a 200-A service must be at least: A) #6 AWG copper B) #4 AWG copper C) #2 AWG copper D) #8 AWG copper Answer: B Explanation: Table 250.66 indicates #4 AWG copper is required for a 200-A service grounding electrode conductor. Question 13. Which of the following is considered a grounding electrode? A) Metal water pipe B) Concrete-encased electrode (Ufer) C) Ground rod D) All of the above Answer: D Explanation: NEC 250.52 lists metal water pipe, concrete-encased electrode, and ground rod as acceptable grounding electrodes.
Journeyman Electrician Ultimate
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Question 14. The size of an equipment grounding conductor (EGC) is determined by: A) The size of the service entrance conductor B) The rating of the overcurrent protective device C) The length of the circuit D) The ambient temperature Answer: B Explanation: Table 250.122 sets the EGC size based on the rating of the overcurrent device protecting the circuit. Question 15. Bonding of metal water piping is required when: A) The pipe is 1 in. or larger B) The pipe is within 5 ft of the service disconnect C) The pipe is used for domestic water only D) The pipe is not connected to a grounding electrode system Answer: D Explanation: NEC 250.104(A) requires bonding of metal water piping when it is not part of the grounding electrode system. Question 16. The maximum number of #12 AWG THHN conductors allowed in 1 - in. EMT without derating is: A) 6 B) 9 C) 12 D) 15 Answer: B Explanation: NEC Table 310.15(B)(3)(a) allows up to 9 conductors of #12 AWG in a conduit before derating. Question 17. What is the temperature rating of THHN insulation? A) 60 °C B) 75 °C
Journeyman Electrician Ultimate
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Answer: D Explanation: NM cable may be run any length provided it is protected from physical damage; there is no specific maximum length. Question 21. Which device must be installed on a 20-A, 120-V branch circuit supplying a bathroom receptacle? A) 20-A GFCI breaker only B) 20-A GFCI receptacle only C) Either a GFCI breaker or receptacle D) No GFCI required Answer: C Explanation: NEC 210.8(A)(1) requires GFCI protection for bathroom receptacles; it can be provided by a GFCI breaker or a GFCI receptacle. Question 22. A three-way switch circuit requires how many switches? A) One B) Two C) Three D) Four Answer: B Explanation: Two three-way switches are used to control a single lighting load from two locations. Question 23. When sizing a feeder for a motor-driven air-conditioning unit, the feeder must be sized for: A) 125 % of the motor full-load current B) 100 % of the motor full-load current C) 150 % of the motor full-load current D) 200 % of the motor full-load current Answer: A Explanation: NEC 430.32 requires feeder conductors for motors to be sized at 125 % of the motor’s full-load current.
Journeyman Electrician Ultimate
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Question 24. The required rating for a motor overload protective device is: A) 115 % of the motor FLC B) 125 % of the motor FLC C) 150 % of the motor FLC D) 200 % of the motor FLC Answer: B Explanation: NEC 430.32(A) states overload protection must be set at 125 % of the motor’s full-load current. Question 25. A water heater rated at 4500 W, 240 V, requires a minimum circuit breaker size of: A) 15 A B) 20 A C) 25 A D) 30 A Answer: B Explanation: Current = 4500 W ÷ 240 V = 18.75 A; the next standard breaker size is 20 A. Question 26. Which transformer rating is required for a 120 V/12 V, 500 VA doorbell transformer? A) 250 VA B) 500 VA C) 750 VA D) 1000 VA Answer: B Explanation: The transformer must be rated at or above the load’s VA; therefore a 500 VA transformer is required. Question 27. In a hazardous (Class I, Division 2) location, which type of conduit is permitted?
Journeyman Electrician Ultimate
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D) No clearance required if bonded Answer: D Explanation: When the water pipe is bonded to the grounding electrode system, no separation clearance is required. Question 31. Under South Dakota law, how often must a journeyman electrician renew their license? A) Every year B) Every two years C) Every three years D) Every five years Answer: B Explanation: SDCL 36-16 mandates license renewal on a biennial (every two years) basis. Question 32. Continuing education for South Dakota electricians must be completed: A) Every renewal period B) Every five years C) Only when requested by the commission D) No CE is required Answer: A Explanation: The state requires documented continuing education for each license renewal cycle. Question 33. The supervisor-to-apprentice ratio allowed in South Dakota is: A) 1: B) 1: C) 1: D) 1: Answer: C
Journeyman Electrician Ultimate
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Explanation: ARSD 20:44 permits a maximum of three apprentices per journeyman supervisor. Question 34. When a homeowner obtains a “homeowner permit,” the electrical work must be performed by: A) Any licensed electrician B) The homeowner, if qualified, under supervision C) Only the permit-issuing authority D) No supervision is required Answer: B Explanation: South Dakota permits homeowners to perform limited work on their own residence, provided they are qualified and the work is inspected. Question 35. The minimum conduit size for a 4-wire, 100-A feeder using #2 AWG copper conductors is: A) 1/2-in. EMT B) 3/4-in. EMT C) 1-in. EMT D) 1-1/4-in. EMT Answer: C Explanation: #2 AWG copper requires at least 1-in. EMT to accommodate the four conductors and any fill allowances. Question 36. Which NEC article governs overcurrent protection for transformers? A) 240 B) 310 C) 450 D) 690 Answer: A Explanation: Article 240 provides the general rules for overcurrent protection, including transformers.
Journeyman Electrician Ultimate
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Question 40. A “listed” product means: A) It has been approved by the manufacturer only B) It meets the requirements of an ANSI/UL standard and is listed by an NRTL C) It is merely labeled for use D) It has been inspected by a local authority Answer: B Explanation: “Listed” indicates the product has been evaluated and approved by a recognized testing laboratory (NRTL) per applicable standards. Question 41. Which of the following is NOT a permissible grounding electrode conductor material? A) Copper B) Aluminum C) Steel D) Copper-clad aluminum Answer: D Explanation: Copper-clad aluminum is not permitted for GECs per NEC 250.66. Question 42. When installing a grounding electrode system for a new residential building, the minimum depth of a ground rod is: A) 4 ft. B) 6 ft. C) 8 ft. D) 10 ft. Answer: B Explanation: NEC 250.53(A)(1) requires ground rods to be at least 8 ft. in length, but they must be driven to a minimum depth of 6 ft. below the surface. Question 43. The main bonding jumper (MBJ) in a residential service must be sized based on: A) The size of the service entrance conductors B) The size of the feeder conductors
Journeyman Electrician Ultimate
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C) The rating of the service disconnecting means D) The size of the equipment grounding conductors Answer: C Explanation: NEC 250.102(C) requires the MBJ to be sized according to the rating of the service disconnecting means. Question 44. A 30-A, 240-V dryer circuit requires which type of receptacle? A) 30-A, 125-V (NEMA 5-30) B) 30-A, 250-V (NEMA 10-30) C) 30-A, 250-V (NEMA 6-30) D) 20-A, 125-V (NEMA 5-20) Answer: B Explanation: Older electric dryers use a 30-A, 250-V NEMA 10 - 30 receptacle; newer models may use NEMA 14 - 30, but the question specifies standard dryer, so answer B. Question 45. The required minimum size for an equipment grounding conductor for a 20-A circuit using copper THHN is: A) #14 AWG B) #12 AWG C) #10 AWG D) #8 AWG Answer: A Explanation: Table 250.122 shows that a 20-A breaker requires a #12 AWG copper EGC, but for THHN the minimum is #14 AWG if the circuit is 15 A; for 20 A, #12 AWG is required. Correction: Answer: B. Explanation: A 20-A circuit requires a #12 AWG copper equipment grounding conductor per Table 250.122. Question 46. Which NEC article specifically addresses requirements for swimming pool installations? A) 680 B
Journeyman Electrician Ultimate
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B) 100 %
C) 125 %
D) 150 %
Answer: C Explanation: NEC 210.20(A) requires branch-circuit conductors and overcurrent devices to be rated at least 125 % of the continuous load. Question 51. Which type of cable is allowed in a damp location but not a wet location? A) NM-B B) UF C) MC D) AC Answer: A Explanation: NM-B (non-metallic sheathed cable, "B" for damp) is permitted in damp locations only; UF is rated for wet locations. Question 52. The minimum size of a grounding electrode conductor for a 100-A service using copper is: A) #8 AWG B) #6 AWG C) #4 AWG D) #2 AWG Answer: B Explanation: Table 250.66 specifies #6 AWG copper for a 100-A service. Question 53. Which NEC article covers the requirements for emergency power systems? A) 700 B) 705 C) 710 D) 720
Journeyman Electrician Ultimate
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Answer: B Explanation: Article 705 addresses the installation of emergency systems, including transfer switches and generators. Question 54. A 120-V, 20-A receptacle installed in a garage must be protected by a GFCI because: A) All garage receptacles require GFCI B) Only receptacles within 6 ft of a floor drain require GFCI C) Only those serving tools require GFCI D) None of the above Answer: A Explanation: NEC 210.8(A)(2) requires all garage receptacles to be GFCI protected. Question 55. When a conduit run exceeds 100 ft, what additional requirement applies? A) Use larger conduit B) Install a pull box every 30 ft C) Use a conduit support at least every 10 ft D) No additional requirement beyond standard support spacing Answer: D Explanation: NEC 300.11 requires supports at intervals not exceeding 3 ft for NM cable, but for conduit the maximum support spacing is 10 ft for metal conduit and 3 ft for flexible metal conduit; there is no extra requirement solely due to length. Question 56. The maximum number of #6 AWG THHN conductors allowed in a 2 - in. PVC conduit without derating is: A) 12 B) 15 C) 18 D) 21 Answer: C
Journeyman Electrician Ultimate
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Question 60. Which of the following is the correct minimum size for a grounding electrode conductor for a 400-A service using aluminum? A) #6 AWG Al B) #4 AWG Al C) #2 AWG Al D) #1/0 AWG Al Answer: C Explanation: Table 250.66 indicates #2 AWG aluminum for a 400-A service. Question 61. The maximum distance a grounding electrode conductor may run without splicing is: A) 20 ft. B) 50 ft. C) 100 ft. D) No limit, provided it is continuous and protected Answer: D Explanation: NEC 250.68(A) permits a continuous grounding electrode conductor of any length as long as it remains unspliced. Question 62. When installing an outlet in a damp location, the receptacle must be: A) Weather-proof with the cover in place B) Non-weather-proof, as long as it is GFCI protected C) Rated for outdoor use only D) No special requirement if the outlet is low voltage Answer: A Explanation: NEC 406.9(A) requires damp-location receptacles to be weather-proof and the cover must remain in place. Question 63. Which NEC article governs the installation of luminaires in hazardous (Class I) locations?
Journeyman Electrician Ultimate
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A) 500
B) 600
C) 700
D) 800
Answer: A Explanation: Article 500 deals with hazardous (Class I, II, III) locations, including luminaire requirements. Question 64. The required ampacity of a #4 AWG copper conductor in a 75 °C ambient temperature, 3-conductor raceway is: A) 70 A B) 85 A C) 95 A D) 115 A Answer: D Explanation: Table 310.15(B)(16) lists #4 AWG copper at 85 A in 60 °C, 95 A in 75 °C, and 115 A in 90 °C. Since the raceway is 75 °C, the ampacity is 95 A. Correction: Answer: C. Explanation: At 75 °C, #4 AWG copper is rated for 95 A. Question 65. A motor-operated fire pump must be supplied from a dedicated feeder that is sized at: A) 125 % of the pump’s rated current B) 150 % of the pump’s rated current C) 200 % of the pump’s rated current D) Exactly the pump’s rated current Answer: B Explanation: NEC 695.4 requires a fire pump feeder to be sized at 150 % of the pump’s rated current. Question 66. Which of the following is a permissible method for bonding a metal water pipe that is not part of the grounding electrode system? A) Using a ground rod attached to the pipe
