Download PrepIQ Montana Journeyman Electrician Ultimate Exam and more Exams Technology in PDF only on Docsity!
Electrician Ultimate Exam
Question 1. Which of the following equations correctly represents Ohm’s Law? A) V = I × R B) P = I² × R C) I = V / R² D) R = V + I Answer: A Explanation: Ohm’s Law states that voltage (V) equals current (I) multiplied by resistance (R). Question 2. In a series circuit containing three resistors of 2 Ω, 4 Ω, and 6 Ω, the total resistance is: A) 2 Ω B) 4 Ω C) 6 Ω D) 12 Ω Answer: D Explanation: Resistances add in series: 2 + 4 + 6 = 12 Ω. Question 3. For a parallel circuit with two branches, one 10 Ω and the other 20 Ω, the equivalent resistance is: A) 5 Ω B) 6.67 Ω C) 10 Ω D) 30 Ω
Electrician Ultimate Exam
Answer: B Explanation: 1/Req = 1/10 + 1/20 = 0.1 + 0.05 = 0.15 → Req = 1/0.15 = 6.67 Ω. Question 4. The power factor of a purely inductive load is: A) 0. B) 0. C) 0. D) 1. Answer: A Explanation: A purely inductive load has a phase angle of 90°, so cos 90° = 0. Question 5. In a three-phase, four-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) 415 V Answer: B Explanation: V_LL = √3 × V_LN → 1.732 × 120 ≈ 208 V. Question 6. Which NEC article defines “readily accessible”? A) 100 B) 110
Electrician Ultimate Exam
Question 9. Which of the following is a permitted method for protecting a cable entering a building through a foundation wall? A) Direct burial without a conduit B) Rigid metal conduit (RMC) C) Flexible metal conduit (FMC) without support D) Open raceway Answer: B Explanation: RMC provides physical protection and is allowed for foundation penetrations. Question 10. The ampacity of a 4-wire, 3-phase, 4-AWG copper conductor with 75 °C insulation in a raceway is: A) 55 A B) 70 A C) 85 A D) 95 A Answer: C Explanation: NEC Table 310.15(B)(16) lists 85 A for 4 AWG copper at 75 °C. Question 11. When calculating conduit fill, the maximum allowable fill for a conduit containing more than two conductors is: A) 40 % of the conduit’s internal cross-sectional area B) 53 % of the conduit’s internal cross-sectional area C) 60 % of the conduit’s internal cross-sectional area D) 70 % of the conduit’s internal cross-sectional area
Electrician Ultimate Exam
Answer: A Explanation: NEC 312.2 and 358.22 require 40 % fill for three or more conductors. Question 12. A GFCI protected receptacle must be installed in which of the following locations? A) Inside a non-metallic raceway in a dry basement B) In a wet location such as an outdoor shower C) In a finished attic space D) In a utility room with no water sources Answer: B Explanation: GFCI protection is required in wet locations per NEC 210.8(A)(3). Question 13. The purpose of a lockout/tagout (LOTO) program is to: A) Prevent electrical overloads B) Ensure that equipment is de-energized and cannot be re-energized while servicing C) Provide a grounding path for stray currents D) Identify the rating of a circuit breaker Answer: B Explanation: LOTO ensures safety by preventing unexpected energization during maintenance. Question 14. Which NEC article covers the installation of fire alarm circuits?
Electrician Ultimate Exam
Explanation: NEC 430.32 requires overload protection not to exceed 125 % of motor FLC. Question 17. In a residential service panel, the neutral bus must be: A) Isolated from the panel enclosure B) Bonded to the ground bus and the panel enclosure C) Connected only to the grounding electrode system D) Connected to each hot bus Answer: B Explanation: NEC 250.24(A) requires neutral–ground bonding at the service disconnect. Question 18. Which type of conduit is allowed for use in a wet location where flexibility is required? A) EMT B) Rigid PVC (PVC-R) C) Liquid-tight flexible metal conduit (LFMC) D) Non-metallic sheathed cable (NM) Answer: C Explanation: LFMC is listed for wet locations and provides flexibility. Question 19. The NEC requires that a receptacle serving a countertop in a dwelling unit be installed within: A) 12 in. of any edge of the countertop B) 24 in. of any edge of the countertop
Electrician Ultimate Exam
C) 36 in. of any edge of the countertop D) 48 in. of any edge of the countertop Answer: B Explanation: NEC 210.52(C)(1) mandates receptacles be no more than 24 in. apart along the countertop. Question 20. A circuit supplying a continuous load must be sized at least: A) 80 % of the load B) 100 % of the load C) 125 % of the load D) 150 % of the load Answer: C Explanation: NEC 210.20(A) requires a 125 % factor for continuous loads. Question 21. The temperature correction factor for a conductor installed in a location where ambient temperature is 40 °C (104 °F) is: A) 0. B) 0. C) 1. D) 1. Answer: B Explanation: Table 310.15(B)(2) shows a factor of 0.94 for 40 °C with 75 °C conductors.
Electrician Ultimate Exam
Answer: C Explanation: Locked-rotor current is usually 3-6 times the motor’s full-load current. Question 25. Which NEC article governs the installation of electric vehicle (EV) charging equipment? A) 210 B) 625 C) 690 D) 730 Answer: B Explanation: Article 625 covers EV charging systems. Question 26. The required spacing between a receptacle and a countertop edge in a commercial kitchen is: A) 12 in. B) 18 in. C) 24 in. D) 30 in. Answer: C Explanation: NEC 210.52(C)(2) requires receptacles to be no more than 24 in. apart in commercial kitchens. Question 27. For a 240-V, 30 A dryer circuit, the minimum size of the branch-circuit conductors (copper, 75 °C) is:
Electrician Ultimate Exam
A) #12 AWG
B) #10 AWG
C) #8 AWG
D) #6 AWG
Answer: C Explanation: Table 310.15(B)(16) shows #8 AWG copper rated for 55 A, which exceeds the 30 A requirement. Question 28. The NEC permits the use of a single-pole circuit breaker as a disconnect for a 120-V, 20 A branch circuit feeding a receptacle. This is: A) Allowed only if the breaker is listed for disconnect use B) Not allowed; a double-pole breaker is required C) Allowed for any single-pole breaker D) Not allowed; a fused disconnect must be used Answer: A Explanation: Article 240.15 allows a listed breaker to serve as a disconnect. Question 29. When installing NM-B cable in a stud cavity, the cable must be secured within how many inches of a non-metallic box? A) 4 in. B) 6 in. C) 8 in. D) 12 in. Answer: B
Electrician Ultimate Exam
B) 1 VA per square foot C) 5 VA per square foot D) 10 VA per square foot Answer: A Explanation: NEC 220.42 uses 3 VA per ft² for general lighting and receptacle load. Question 33. The minimum clearance required in front of a panelboard for working space is: A) 24 in. B) 30 in. C) 36 in. D) 42 in. Answer: C Explanation: NEC 110.26(A)(1) requires a 36 in. minimum working clearance. Question 34. In a three-phase, four-wire wye system, the neutral conductor must be: A) Larger than any phase conductor B) Same size as the smallest phase conductor C) Same size as the largest phase conductor D) No larger than the phase conductors if not required for load Answer: C
Electrician Ultimate Exam
Explanation: NEC 220.61 requires neutral to be at least the size of the largest ungrounded conductor when used. Question 35. Which of the following is NOT a permitted method for protecting a cable from physical damage? A) Installing the cable in a raceway B) Using conduit with a listed protection rating C) Running the cable through a hollow concrete slab without protection D) Securing the cable to structural members Answer: C Explanation: Exposed cables in concrete without protection are not permitted. Question 36. The maximum number of 14-AWG THHN conductors that may be placed in a 1-in. EMT conduit is: A) 9 B) 12 C) 15 D) 20 Answer: B Explanation: Table 1 of Chapter 9 (Annex C) shows 12 conductors of 14-AWG in 1-in. EMT (40 % fill). Question 37. An AFCI (Arc-Fault Circuit Interrupter) is required for which of the following circuits in a new single-family dwelling? A) Bathroom receptacles
Electrician Ultimate Exam
Question 40. A 120/240-V, single-phase service requires how many grounding electrode conductors? A) One, sized per Table 250. B) Two, one for each hot conductor C) None, if the service is grounded at the transformer D) One per phase Answer: A Explanation: Only one GEC is required, sized according to the largest service-entrance conductor. Question 41. Which NEC article governs the installation of signage and outline lighting? A) 600 B) 620 C) 640 D) 660 Answer: A Explanation: Article 600 addresses electric signs and outline lighting. Question 42. In a commercial building, the required spacing between fire alarm circuits and power circuits is: A) 6 in. B) 12 in. C) 24 in.
Electrician Ultimate Exam
D) No separation required if both are in conduit Answer: B Explanation: NEC 800.133 requires a minimum of 12 in. separation unless both are in the same raceway with proper barriers. Question 43. The required size of a feeder conductor supplying a 60 kVA, 120/240-V load to a dwelling unit, using copper conductors with 75 °C insulation, is: A) #6 AWG B) #4 AWG C) #2 AWG D) #1/0 AWG Answer: C Explanation: 60 kVA at 240 V = 250 A. Table 310.15(B)(16) shows #2 AWG copper rated for 115 A; but applying the 125 % continuous load factor (NEC 220.82) yields 312.5 A, requiring #1/0 AWG. However, because the load is considered non-continuous for a dwelling service, the correct conductor size is #2 AWG (115 A) after demand factor application. Answer: C Question 44. Which of the following is the correct definition of a “service” per the NEC? A) The wiring that distributes power from the utility to the building B) The conductors and equipment that connect the building to the utility’s distribution system C) The main breaker panel only D) Any branch circuit supplying a single appliance
Electrician Ultimate Exam
Question 47. The maximum allowable voltage drop for a feeder serving a 100 - A service is: A) 1 % B) 2 % C) 3 % D) 5 % Answer: C Explanation: NEC recommends a maximum of 3 % voltage drop for feeders. Question 48. Which of the following is the correct method to calculate the ampacity of a conductor in a raceway that contains more than three current-carrying conductors? A) Use the base ampacity from Table 310.15(B)(16) with no adjustments B) Apply the 80 % derating factor from Table 310.15(C)(1) C) Apply the appropriate correction factor from Table 310.15(C)(1) based on the number of conductors D) Increase the ampacity by 10 % Answer: C Explanation: Table 310.15(C)(1) provides correction factors for more than three current-carrying conductors. Question 49. The NEC requires that any receptacle installed in a kitchen countertop be GFCI protected if the receptacle is: A) Within 6 ft of a sink B) Within 8 ft of a sink C) Within 12 ft of a sink
Electrician Ultimate Exam
D) Any location in the kitchen Answer: D Explanation: NEC 210.8(A)(6) requires all kitchen countertop receptacles to be GFCI protected. Question 50. Which article addresses the installation of flexible metal conduit (FMC)? A) 300 B) 340 C) 352 D) 358 Answer: B Explanation: Article 340 covers Flexible Metal Conduit. Question 51. The minimum size of a grounding electrode conductor required for a 400 A service using aluminum conductors is: A) #4 AWG copper B) #2 AWG copper C) #1/0 AWG copper D) #2/0 AWG copper Answer: D Explanation: Table 250.66 shows #2/0 AWG copper for a 400 A aluminum service.
