Download Alaska Journeyman Electrician Exam Verified Questions, Correct Answers, and Detailed Ex and more Exams Electrical and Electronics Engineering in PDF only on Docsity!
Alaska Journeyman Electrician Exam Verified
Questions, Correct Answers, and Detailed
Explanations for Science Students||Already Graded
A+
1. What is the maximum allowable voltage drop for branch circuits in a dwelling? A. 2% B. 3% C. 5% D. 10% Answer: B. 3% Rationale: NEC recommends a maximum voltage drop of 3% for branch circuits to ensure efficient operation of electrical equipment. 2. Which conductor material is most commonly used for residential wiring? A. Aluminum B. Copper C. Silver D. Iron Answer: B. Copper Rationale: Copper is preferred due to its high conductivity, durability, and ease of installation. 3. What is the minimum depth a 120V residential circuit must be buried in soil without a raceway? A. 12 inches B. 18 inches C. 24 inches D. 6 inches Answer: A. 12 inches Rationale: NEC Table 300.5 specifies 12 inches minimum for nonmetallic-sheathed cable (NM) in direct burial.
4. What is the NEC standard for ground-fault protection in dwelling unit receptacles? A. AFCI B. GFCI C. ELCI D. TFCI Answer: B. GFCI Rationale: Ground-Fault Circuit Interrupters (GFCIs) are required in areas like kitchens, bathrooms, and outdoors to protect against shock. 5. Which type of conduit is permitted for underground installation without additional protection? A. EMT B. RMC C. PVC D. FMC Answer: C. PVC Rationale: PVC conduit is rated for direct burial and provides corrosion resistance in underground installations. 6. What is the primary purpose of an AFCI? A. Prevent overvoltage B. Protect against ground faults C. Prevent arcing faults D. Limit current Answer: C. Prevent arcing faults Rationale: Arc-Fault Circuit Interrupters (AFCIs) protect circuits from fires caused by arcing. 7. In a 120/240V single-phase system, what is the voltage between the two hot conductors? A. 120V B. 208V C. 240V
11. How many conductors are in a typical 120/240V single-phase circuit excluding ground? A. 1 B. 2 C. 3 D. 4 Answer: C. 3 Rationale: Two hots and one neutral make three conductors in a 120/240V single-phase setup. 12. Which type of breaker is required for a kitchen countertop receptacle? A. Standard breaker B. AFCI C. GFCI D. Dual-purpose AFCI/GFCI Answer: C. GFCI Rationale: NEC requires GFCI protection for all kitchen countertop receptacles to prevent electric shock. 13. What is the maximum overcurrent protection allowed for 14 AWG copper wire? A. 10A B. 15A C. 20A D. 25A Answer: B. 15A Rationale: NEC Table 310.15(B)(16) limits 14 AWG copper wire to 15A for safety. 14. What device provides both overcurrent and short-circuit protection? A. Fuse B. Transformer C. GFCI
D. Surge protector Answer: A. Fuse Rationale: Fuses interrupt current flow when it exceeds safe limits, protecting circuits from overloads.
15. Which NEC article covers the installation of motors? A. Article 430 B. Article 440 C. Article 480 D. Article 500 Answer: A. Article 430 Rationale: Article 430 details motor installation, sizing, and protection requirements. 16. What is the minimum size copper grounding electrode conductor for a 200A service? A. 4 AWG B. 6 AWG C. 2 AWG D. 1/0 AWG Answer: B. 6 AWG Rationale: NEC Table 250.66 specifies 6 AWG copper as the minimum for a 200A service grounding electrode. 17. Which type of cable is commonly used for residential wiring in walls? A. MC B. NM C. UF D. AC Answer: B. NM Rationale: Nonmetallic-sheathed (NM) cable, or Romex, is standard for interior residential wiring.
Answer: B. Article 590 Rationale: NEC Article 590 covers temporary electrical power and lighting for construction, remodeling, and maintenance.
22. What is the maximum distance between supports for Type NM cable in walls? A. 2 ft B. 4 ft C. 6 ft D. 8 ft Answer: B. 4 ft Rationale: NEC 334.30 requires nonmetallic-sheathed cable to be supported every 4 feet. 23. What is the minimum size copper conductor for a 20A branch circuit? A. 14 AWG B. 12 AWG C. 10 AWG D. 8 AWG Answer: B. 12 AWG Rationale: NEC Table 310.15(B)(16) allows 12 AWG copper for 20A circuits. 24. Which conductor is connected to the neutral bar in a panel? A. Grounding conductor B. Ungrounded conductor C. Grounded conductor D. Both A and C Answer: C. Grounded conductor Rationale: The neutral (grounded) conductor returns current to the source and connects to the neutral bus bar. 25. In a three-phase system, what is the phase-to-phase voltage if the phase-to-neutral voltage is 208V?
A. 208V
B. 240V
C. 360V
D. 120V
Answer: C. 360V Rationale: Line-to-line voltage = Phase-to-neutral voltage × √3 → 208 × 1.732 ≈ 360V.
26. What type of conductor is used to bond metal water pipes? A. Grounding electrode conductor B. Neutral conductor C. Ungrounded conductor D. Hot conductor Answer: A. Grounding electrode conductor Rationale: Bonding metal water pipes prevents potential differences and ensures safe grounding. 27. What is the primary function of a surge arrester? A. Prevent overcurrent B. Protect equipment from voltage spikes C. Limit voltage drop D. Isolate circuits Answer: B. Protect equipment from voltage spikes Rationale: Surge arresters protect sensitive equipment from transient voltage surges. 28. Which type of cable is sunlight-resistant for outdoor use? A. NM B. UF C. SE D. THHN Answer: B. UF Rationale: Underground Feeder (UF) cable is rated for direct burial and sunlight exposure.
D. 600
Answer: B. 400 Rationale: NEC Article 400 provides rules for flexible cords, including types, usage, and protection.
33. What is the purpose of a main bonding jumper in a service panel? A. Connect neutral to ground B. Isolate neutral from ground C. Protect against surges D. Increase current capacity Answer: A. Connect neutral to ground Rationale: The main bonding jumper ensures the neutral is properly bonded to the service ground for safety. 34. What is the typical rating for a residential water heater circuit? A. 15A B. 20A C. 30A D. 40A Answer: C. 30A Rationale: Water heaters are usually 240V devices with 30A breakers to handle the load safely. 35. Which type of conduit can be bent with a hand bender? A. RMC B. EMT C. PVC D. IMC Answer: B. EMT Rationale: Electrical Metallic Tubing (EMT) is thin-walled and can be field-bent with a hand bender. 36. What is the minimum size copper equipment grounding conductor for a 100A circuit? A. 12 AWG
B. 10 AWG
C. 8 AWG
D. 6 AWG
Answer: B. 10 AWG Rationale: NEC Table 250.122 specifies 10 AWG copper for 100A circuits.
37. Which device detects and interrupts low-level ground faults? A. GFCI B. AFCI C. Fuse D. Circuit breaker Answer: A. GFCI Rationale: GFCIs trip at currents as low as 4–6 mA to prevent shock. 38. Which type of outlet is required in bathrooms? A. Standard B. GFCI C. AFCI D. Twisted Answer: B. GFCI Rationale: Bathrooms require GFCI protection for receptacles to prevent electric shock near water. 39. What is the NEC required clearance above electrical panels? A. 24 inches B. 30 inches C. 36 inches D. 48 inches Answer: C. 36 inches Rationale: NEC 110.26 requires a 36-inch clear workspace in front of panels. 40. Which conductor is used for service entrance bonding? A. Grounding electrode conductor
44. Which color is required for equipment grounding conductors? A. Black B. White C. Green or bare D. Red Answer: C. Green or bare Rationale: NEC standardizes green or bare conductors for grounding purposes. 45. What is the minimum burial depth for rigid metal conduit under a driveway? A. 6 inches B. 12 inches C. 18 inches D. 24 inches Answer: C. 18 inches Rationale: NEC Table 300.5 specifies 18 inches for RMC under driveways. 46. Which type of breaker is required for a bedroom in a dwelling? A. Standard breaker B. GFCI C. AFCI D. Dual-purpose GFCI/AFCI Answer: C. AFCI Rationale: NEC requires arc-fault protection in bedrooms to prevent fires. 47. How is a multiwire branch circuit identified in a panel? A. With a white tape B. By double-pole breaker C. With red tape D. With black tape Answer: B. By double-pole breaker
Rationale: Multiwire circuits share a neutral and require a double- pole breaker for simultaneous disconnection.
48. Which device protects equipment from short circuits? A. GFCI B. AFCI C. Circuit breaker or fuse D. Isolation transformer Answer: C. Circuit breaker or fuse Rationale: Overcurrent devices interrupt high fault currents to protect conductors and equipment. 49. Which NEC article covers photovoltaic (solar) systems? A. 690 B. 705 C. 720 D. 740 Answer: A. 690 Rationale: Article 690 provides requirements for PV systems, including wiring, grounding, and overcurrent protection. 50. What is the NEC minimum bending radius for 1-inch EMT? A. 6 inches B. 8 inches C. 10 inches D. 12 inches Answer: C. 10 inches Rationale: NEC 344.24 specifies a minimum bending radius of 10 times the conduit diameter for EMT. 51. What is the maximum overcurrent protection allowed for 12 AWG copper wire? A. 15A B. 20A C. 25A
A. AFCI breaker B. GFCI breaker C. Standard breaker D. Isolation transformer Answer: A. AFCI breaker Rationale: AFCIs protect circuits from arcing faults and also provide overcurrent protection.
56. What is the maximum voltage for low-voltage landscape lighting? A. 12V B. 24V C. 30V D. 48V Answer: B. 24V Rationale: NEC Article 411 limits low-voltage lighting to 30V, with 24V being a common standard for outdoor lighting. 57. Which conductor is used to bond metal parts of a pool structure? A. Grounding electrode conductor B. Equipment grounding conductor C. Neutral conductor D. Ungrounded conductor Answer: B. Equipment grounding conductor Rationale: Metal parts must be bonded to prevent shock hazards from stray currents. 58. How many disconnects are allowed for a single-service entrance? A. 1 B. 2 C. 6 D. 12 Answer: C. 6 Rationale: NEC 230.71 allows up to six service disconnects for a single service.
59. What is the minimum height for overhead service conductors above a residential driveway? A. 12 ft B. 15 ft C. 18 ft D. 20 ft Answer: B. 15 ft Rationale: NEC 230.24 specifies minimum clearances for overhead conductors over driveways. 60. What is the minimum size copper equipment grounding conductor for a 200A service? A. 6 AWG B. 4 AWG C. 2 AWG D. 1/0 AWG Answer: A. 6 AWG Rationale: NEC Table 250.122 specifies 6 AWG copper for 200A service grounding. 61. Which type of insulation is required for conductors installed in wet locations? A. THHN B. THWN C. NM D. UF Answer: B. THWN Rationale: THWN-rated conductors are suitable for wet locations and resist moisture. 62. What is the purpose of a lockable disconnect at a commercial rooftop unit? A. Overcurrent protection B. Maintenance safety C. Voltage transformation
66. Which conductor is always connected to the metal parts of equipment? A. Hot conductor B. Neutral conductor C. Grounding conductor D. Phase conductor Answer: C. Grounding conductor Rationale: Grounding conductors prevent shock by connecting exposed metal to ground. 67. What is the minimum size copper conductor for a 60A branch circuit? A. 10 AWG B. 8 AWG C. 6 AWG D. 4 AWG Answer: B. 8 AWG Rationale: NEC Table 310.15(B)(16) specifies 8 AWG copper for 60A circuits. 68. Which NEC article covers hazardous (classified) locations? A. 500 B. 600 C. 700 D. 725 Answer: A. 500 Rationale: Article 500 defines requirements for locations with flammable gases, vapors, or dust. 69. What is the minimum required ampacity for a feeder supplying a 100A panel? A. 80A B. 100A C. 120A D. 150A
Answer: B. 100A Rationale: The feeder must meet or exceed the panel rating to safely supply the load.
70. Which device is used to protect circuits from overvoltage due to lightning? A. Surge arrester B. GFCI C. AFCI D. Standard breaker Answer: A. Surge arrester Rationale: Surge arresters absorb and redirect voltage spikes from lightning or switching events. 71. What is the minimum size grounding electrode for a metal underground water pipe? A. 4 AWG copper B. 6 AWG copper C. 8 AWG copper D. 10 AWG copper Answer: B. 6 AWG copper Rationale: NEC Table 250.66 specifies a minimum 6 AWG copper conductor for bonding metal underground water pipes. 72. Which type of breaker is required for a home office to protect computers from arcing? A. GFCI B. AFCI C. Standard breaker D. Dual-purpose GFCI/AFCI Answer: B. AFCI Rationale: AFCIs detect arcing faults that could ignite fires in home offices.
