Download PrepIQ Kansas KS 558 Journeyman Electrician Ultimate Exam and more Exams Technology in PDF only on Docsity!
Journeyman Electrician
Ultimate Exam
Question 1. Which equation correctly represents Ohm’s Law? A) P = V × I B) V = I × R C) I = V ÷ P D) R = V × I Answer: B Explanation: Ohm’s Law states that voltage (V) equals current (I) multiplied by resistance (R). Question 2. The power factor of a purely resistive AC circuit is: A) 0 B) 0. C) 1 D) 0. Answer: C Explanation: In a resistive circuit, voltage and current are in phase, giving a power factor of unity (1). Question 3. In a series circuit, the total resistance is: A) The sum of individual resistances B) The reciprocal of the sum of reciprocals C) Equal to the largest resistance only D) Independent of the number of resistors Answer: A Explanation: Series resistance adds directly: Rt = R1 + R2 + ….
Journeyman Electrician
Ultimate Exam
Question 4. Which NEC term defines the maximum continuous current a conductor can safely carry? A) Ampacity B) Conductivity C) Reactance D) Susceptance Answer: A Explanation: Ampacity is the allowable current rating for a conductor under specific conditions. Question 5. According to NEC Article 100, “accessible” means: A) Readily reached without removing any part of the building structure B) Reachable only after opening a panel door C) Only reachable with a ladder D) Reachable after cutting the wall Answer: A Explanation: “Accessible” refers to equipment that can be reached without dismantling building components. Question 6. The proper tool for measuring voltage in a residential circuit is: A) Ammeter B) Ohmmeter C) Voltmeter (or multimeter set to voltage) D) Wattmeter
Journeyman Electrician
Ultimate Exam
Answer: A Explanation: A UFER (concrete-encased electrode) is placed in concrete, typically a footing. Question 10. Bonding a gas pipe to the grounding system is required because: A) It reduces voltage drop B) It prevents stray currents that could ignite gas C) It improves power factor D) It increases ampacity Answer: B Explanation: Bonding eliminates potential differences that could cause arcing and ignition. Question 11. When calculating load for a general-lighting branch circuit, the NEC demands a demand factor of: A) 100 % B) 80 % C) 70 % D) 60 % Answer: B Explanation: General-lighting loads are multiplied by 0.8 (80 %) for demand calculations. Question 12. The ampacity of a 3 AWG THHN copper conductor with 75 °C rating is: A) 55 A
Journeyman Electrician
Ultimate Exam
B) 85 A
C) 115 A
D) 130 A
Answer: C Explanation: Table 310.16 shows 3 AWG THHN at 75 °C is rated for 115 A. Question 13. For a 120-V, 20-A branch circuit, the minimum copper conductor size is: A) 14 AWG B) 12 AWG C) 10 AWG D) 8 AWG Answer: B Explanation: 12 AWG copper is rated for 20 A at 60 °C, meeting the requirement. Question 14. A 30-A circuit breaker protecting a 10 AWG copper conductor is: A) Undersized B) Correctly sized C) Oversized D) Not permitted Answer: C Explanation: 10 AWG copper is rated for 30 A, but NEC requires the breaker not to exceed the conductor’s ampacity; a 30-A breaker is acceptable, not oversized.
Journeyman Electrician
Ultimate Exam
Question 18. The maximum fill for a 1/2-in. EMT conduit with three #12 THHN conductors is: A) 40 % B) 35 % C) 31 % D) 25 % Answer: B Explanation: Annex C permits 35 % fill for three conductors in a conduit. Question 19. When using NM-B cable, the maximum number of conductors allowed in a single 2-in. metal box is: A) 4 B) 6 C) 8 D) 10 Answer: C Explanation: Box fill calculations (each #12 conductor = 2.25 cu in.) allow up to eight #12 conductors in a 2-in. box. Question 20. The required spacing between receptacles in a kitchen countertop is: A) 12 in. B) 18 in. C) 24 in. D) 30 in.
Journeyman Electrician
Ultimate Exam
Answer: C Explanation: NEC 210.52(C)(1) mandates receptacles no more than 24 in. apart. Question 21. A 30-A dryer circuit must be supplied by: A) 12 AWG copper B) 10 AWG copper C) 8 AWG copper D) 6 AWG copper Answer: C Explanation: Dryer circuits require 30 A and a minimum of 8 AWG copper (or 6 AWG aluminum). Question 22. A 20-A, 120-V receptacle must be grounded with: A) A separate grounding conductor only B) The equipment grounding conductor in the cable C) No grounding required if GFCI protected D) A neutral conductor Answer: B Explanation: The equipment grounding conductor (EGC) must be present in the circuit. Question 23. The purpose of a bonding jumper in a service panel is to: A) Increase ampacity B) Provide a low-impedance path between grounded metal parts C) Reduce voltage drop
Journeyman Electrician
Ultimate Exam
A) 12 in. above the floor B) 24 in. above the floor C) 30 in. above the floor D) No specific height Answer: D Explanation: NEC does not prescribe a minimum mounting height for hallway receptacles. Question 27. A 15-A GFCI breaker protects a circuit that supplies: A) A dedicated 120-V water heater B) All receptacles in a basement C) A 240-V electric range D) An outdoor lighting circuit Answer: B Explanation: GFCI protection is required for receptacles in basements. Question 28. The correct method to terminate a grounding electrode conductor to a concrete-encased electrode is: A) Directly clamp to rebar B) Use a listed grounding clamp to the rebar C) Wrap with electrical tape D) Solder to the rebar Answer: B Explanation: NEC 250.70(A)(1) requires a listed clamp for the connection.
Journeyman Electrician
Ultimate Exam
Question 29. For a motor with a full-load current of 30 A, the minimum size of the overcurrent protective device is: A) 30 A B) 35 A C) 40 A D) 45 A Answer: C Explanation: NEC 430.32 requires the OCPD to be 125 % of the motor FLC: 30 A × 1.25 = 37.5 A → next standard size 40 A. Question 30. The required grounding conductor size for a 200-A service using copper is: A) 4 AWG B) 2 AWG C) 1/0 AWG D) 3/0 AWG Answer: B Explanation: Table 250.122 lists 2 AWG copper for a 200-A service. Question 31. A conduit run that changes direction must be supported within how many inches of each bend? A) 6 in. B) 12 in. C) 24 in. D) No support required
Journeyman Electrician
Ultimate Exam
D) Is a lighting load only Answer: A Explanation: NEC defines continuous loads as those expected to run for three hours or more. Question 35. The minimum clearance in front of a service disconnecting means is: A) 30 in. B) 36 in. C) 42 in. D) 48 in. Answer: B Explanation: NEC 110.26(A)(1) requires a minimum working space of 36 in. in front of service equipment. Question 36. The correct size of a conduit fill for 4 #6 AWG THHN conductors in 1 - in. EMT is: A) 25 % B) 31 % C) 40 % D) 53 % Answer: B Explanation: Annex C permits 40 % fill for more than two conductors; 4 #6 THHN in 1 - in. EMT stays within the 40 % limit. Question 37. Which of the following is NOT a permitted grounding electrode?
Journeyman Electrician
Ultimate Exam
A) Metal water pipe B) Concrete-encased electrode C) Steel I-beam not bonded to earth D) Ground rod Answer: C Explanation: A steel I-beam not bonded to earth does not meet grounding electrode criteria. Question 38. In a commercial office, the minimum number of receptacles required per wall space is: A) One per 6 ft B) One per 8 ft C) One per 12 ft D) One per 18 ft Answer: B Explanation: NEC 210.52(A)(1) requires receptacles at intervals not exceeding 8 ft. Question 39. For a 240-V, 30-A electric range, the required branch-circuit conductor size (copper) is: A) 12 AWG B) 10 AWG C) 8 AWG D) 6 AWG Answer: C Explanation: 30-A circuits require at least 8 AWG copper per Table 310.16.
Journeyman Electrician
Ultimate Exam
Answer: C Explanation: Underground Feeder (UF) cable is rated for wet locations. Question 43. The NEC requires a disconnecting means for each: A) Individual appliance B) Building service entrance C) Lighting fixture D) Switch Answer: B Explanation: A service disconnect must be provided at the point where power enters the building. Question 44. The required spacing between a bathroom GFCI receptacle and the basin is: A) 6 in. B) 12 in. C) 18 in. D) No specific spacing Answer: B Explanation: NEC 210.8(A)(1) requires GFCI receptacles to be installed at least 12 in. from the basin edge. Question 45. For a 125-A feeder supplying a commercial load, the minimum size of copper conductors (THHN) is: A) 2 AWG B) 1/0 AWG C) 3/0 AWG
Journeyman Electrician
Ultimate Exam
D) 4/0 AWG
Answer: B Explanation: Table 310.16 shows 1/0 AWG THHN rated for 150 A; however, for 125 A the next standard size is 1/0 AWG. Question 46. The maximum height for a receptacle installed in a kitchen countertop is: A) 18 in. above the countertop B) 24 in. above the countertop C) 30 in. above the countertop D) No limit Answer: A Explanation: NEC 210.52(C)(1) limits countertop receptacles to no more than 18 in. above the countertop surface. Question 47. When a feeder voltage is 277 V, the nominal voltage used for calculations is: A) 240 V B) 277 V C) 300 V D) 480 V Answer: B Explanation: The feeder’s nominal voltage is the actual system voltage, 277 V, used for voltage-drop calculations. Question 48. A “dedicated” circuit is defined as one that:
Journeyman Electrician
Ultimate Exam
Question 51. In a three-phase, four-wire wye system, the phase-to-ground voltage is: A) Same as phase-to-phase voltage B) √3 times the phase-to-phase voltage C) One-half the phase-to-phase voltage D) One-third the phase-to-phase voltage Answer: C Explanation: In a wye system, V_phase-ground = V_phase-phase ÷ √3; effectively about 0.577 times, i.e., roughly one-half. Question 52. The minimum size of a conduit for a single 4/0 AWG aluminum service entrance conductor is: A) 1-in. EMT B) 1-in. PVC C) 1-1/2-in. EMT D) 2-in. PVC Answer: C Explanation: 4/0 AWG aluminum requires at least 1-1/2-in. EMT for proper fill. Question 53. Which of the following is the correct method for grounding a metal water pipe that is not electrically continuous with the grounding electrode system? A) Install a separate ground rod near the pipe B) Connect a grounding electrode conductor to the pipe with a listed clamp C) Wrap the pipe with copper tape D) No grounding required
Journeyman Electrician
Ultimate Exam
Answer: B Explanation: NEC 250.104(A) requires a listed clamp to bond the water pipe to the grounding system. Question 54. The NEC defines a “hazardous (Class I) location” as an area where: A) Flammable gases may be present in sufficient quantities to produce an ignitable mixture B) Only dust is present C) Only static electricity is a concern D) No combustible material exists Answer: A Explanation: Class I locations involve flammable gases or vapors. Question 55. For a swimming pool pump motor, the NEC requires a disconnecting means to be located within: A) 25 ft of the pool B) 50 ft of the pool C) 75 ft of the pool D) No distance limitation Answer: B Explanation: NEC 680.26(A) requires the disconnect to be not more than 50 ft from the pool equipment. Question 56. An emergency lighting circuit must be supplied from: A) A dedicated 120-V branch circuit with an uninterruptible power source (UPS) B) Any general-lighting circuit
