Download PrepIQ Hawaii Journey Worker Electrician Ultimate Exam and more Exams Technology in PDF only on Docsity!
Ultimate Exam
Question 1. Which of the following formulas correctly calculates electrical power in a DC circuit? A) P = V × I B) P = V ÷ I C) P = I² ÷ R D) P = V² × R Answer: A Explanation: In a DC circuit, power (P) equals voltage (V) multiplied by current (I). Question 2. In an AC system, the relationship between apparent power (S), real power (P), and power factor (PF) is: A) S = P ÷ PF B) P = S × PF C) PF = P ÷ S² D) S = P × PF Answer: B Explanation: Real power equals apparent power multiplied by the power factor (P = S × PF). Question 3. Which circuit configuration has the same current flowing through all components? A) Series B) Parallel
Ultimate Exam
C) Combination D) None of the above Answer: A Explanation: In a series circuit, the same current passes through each element. Question 4. For a purely inductive load, the phase angle between voltage and current is: A) 0° B) 30° lagging C) 90° lagging D) 90° leading Answer: C Explanation: Inductive loads cause current to lag voltage by 90°. Question 5. According to NEC Article 100, “accessible” means: A) Capable of being reached without using tools B) Capable of being reached without removing obstacles or parts of a building C) Capable of being reached only by qualified persons D) Capable of being reached only after the power is shut off Answer: B
Ultimate Exam
Question 8. The purpose of a grounding electrode conductor (GEC) is to: A) Carry fault current back to the source B) Provide a low-impedance path to earth for system grounding C) Protect conductors from overload D) Balance the three-phase system Answer: B Explanation: The GEC connects the grounding electrode system to the service grounding point, providing a low-impedance path to earth. Question 9. Which of the following is an acceptable grounding electrode for a residential building? A) A 2 in. copper pipe buried 4 ft deep B) A concrete-encased electrode (Ufer) at least 20 ft of #4 rebar C) A 10-ft rubber insulated grounding rod D) A metal water pipe not bonded to the system Answer: B Explanation: A concrete-encased electrode meeting the Ufer requirements is an acceptable grounding electrode. Question 10. The minimum size of a grounding electrode conductor for a 100 A service using copper is: A) #8 AWG B) #6 AWG
Ultimate Exam
C) #4 AWG
D) #2 AWG
Answer: B Explanation: Table 250.66 of the NEC specifies #6 AWG copper for a 100 A service. Question 11. Equipment grounding conductors (EGC) must be sized to: A) Carry normal load current B) Carry maximum fault current without melting C) Be the same size as the ungrounded conductor D) Match the size of the neutral conductor Answer: B Explanation: EGCs are sized to safely conduct fault current until the overcurrent device operates. Question 12. Bonding of gas piping is required: A) Only in commercial buildings B) Only when the pipe is metallic C) In all occupancies where the pipe is electrically conductive D) Never, gas piping is exempt Answer: C
Ultimate Exam
Question 15. The minimum clear space in front of a service disconnecting means is: A) 30 in. high, 36 in. wide, 36 in. deep B) 36 in. high, 30 in. wide, 30 in. deep C) 42 in. high, 42 in. wide, 42 in. deep D) 24 in. high, 24 in. wide, 24 in. deep Answer: A Explanation: NEC 110.26 requires at least 30 in. high, 36 in. wide, and 36 in. deep working space. Question 16. When calculating the load for a branch circuit supplying lighting, the demand factor for the first 3 kW is: A) 100% B) 80% C) 60% D) 40% Answer: A Explanation: NEC Table 220.42 uses 100% for the first 3 kW of lighting load. Question 17. A multi-wire branch circuit (MWBC) must have its ungrounded conductors: A) Of different colors B) Connected together at the outlet
Ultimate Exam
C) Disconnected simultaneously by a common-trip breaker or handle tie D) Protected by separate overcurrent devices Answer: C Explanation: NEC requires simultaneous disconnection of the ungrounded conductors in an MWBC. Question 18. For a continuous load, conductors must be sized at least: A) 80% of the ampacity B) 100% of the ampacity C) 125% of the load current D) 150% of the load current Answer: C Explanation: Continuous loads require conductors sized for 125% of the load current (NEC 210.20(A)). Question 19. The standard ampere rating for a typical residential circuit breaker protecting a 15 A branch circuit is: A) 10 A B) 15 A C) 20 A D) 30 A Answer: B
Ultimate Exam
Question 22. According to NEC Chapter 9, the allowable conduit fill for more than two conductors in a raceway is: A) 40% of the conduit’s cross-sectional area B) 45% C) 31% D) 53% Answer: C Explanation: For three or more conductors, the fill must not exceed 40% for raceways; however, for conduit, the limit is 40% for two conductors and 31% for three or more. Question 23. The box fill calculation for a standard duplex receptacle requires: A) One conductor volume for each terminal-connected wire plus one for the device B) One conductor volume for each wire only C) One conductor volume for each grounding conductor only D) No box fill calculation is required Answer: A Explanation: NEC requires counting each conductor that terminates on a device plus an additional fill for the device itself. Question 24. The minimum size of a pull box used for a single 4 AWG ungrounded conductor and a #12 EGC is: A) 4 in. × 4 in. × 2 in.
Ultimate Exam
B) 6 in. × 6 in. × 4 in. C) 8 in. × 8 in. × 4 in. D) 10 in. × 10 in. × 6 in. Answer: B Explanation: Box volume must accommodate the conductors’ fill; a 6 × 6 × 4 in. box provides sufficient volume for the listed conductors. Question 25. Which insulation type is rated for wet locations up to 90 °C? A) THHN B) THWN- 2 C) XHHW- 2 D) NM-B Answer: C Explanation: XHHW-2 is rated for 90 °C in both wet and dry locations. Question 26. When more than three current-carrying conductors are in a conduit, the ampacity of each conductor must be: A) Increased by 10% B) Kept the same C) De-rated according to Table 310.15(B)(3)(a) D) De-rated according to Table 310.15(B)(2)(a)
Ultimate Exam
A) Type NM B) Type UF C) Type MC D) Type THHN Answer: B Explanation: Underground feeder (UF) cable is rated for direct burial. Question 30. The minimum size of a service-entrance cable (SE) for a 200 A residential service is: A) 4/0 AWG copper B) 2/0 AWG aluminum C) 1/0 AWG copper D) 3/0 AWG aluminum Answer: A Explanation: NEC Table 310.12 requires 4/0 AWG copper for a 200 A service entrance. Question 31. A three-phase motor has a full-load amperage (FLA) of 30 A and a service factor of 1.15. The motor’s rated current is: A) 30 A B) 34.5 A C) 26.1 A D) 45 A
Ultimate Exam
Answer: B Explanation: Rated current = FLA × Service Factor = 30 A × 1.15 = 34.5 A. Question 32. The purpose of a magnetic contactor in a motor control circuit is to: A) Provide overload protection B) Offer a manual start/stop function C) Switch high-current motor power using a low-current control signal D) Measure motor speed Answer: C Explanation: Magnetic contactors allow a low-current control circuit to switch the high-current motor circuit. Question 33. According to NEC, a GFCI receptacle is required in which of the following residential locations? A) Living room B) Kitchen countertop C) Bedroom D) Hallway Answer: B Explanation: GFCI protection is mandated for receptacles serving kitchen countertops.
Ultimate Exam
B) Listed for wet locations C) Unlisted if protected by a cover D) Rated for indoor use Answer: B Explanation: Fixtures in wet locations must be listed for wet locations. Question 37. The required grounding conductor size for a 30 A branch circuit using copper conductors is: A) #12 AWG B) #10 AWG C) #8 AWG D) #6 AWG Answer: B Explanation: Table 250.122 specifies #10 AWG copper for a 30 A circuit. Question 38. In a hazardous (Class I) location, the equipment must be: A) Explosion-proof (Ex d) or intrinsically safe B) Rated for damp locations only C) Installed without any grounding D) Equipped with a GFCI Answer: A
Ultimate Exam
Explanation: Class I hazardous locations require equipment that prevents ignition, such as explosion-proof or intrinsically safe devices. Question 39. The NEC defines a “temporary wiring” installation as one that: A) Is installed for less than 30 days B) Must be listed for permanent use C) Requires a dedicated grounding electrode system D) Must be installed in conduit only Answer: A Explanation: Temporary wiring is defined as wiring installed for a limited period, typically not exceeding 30 days. Question 40. A Class 2 circuit is limited to a maximum voltage of: A) 30 V B) 50 V C) 60 V D) 100 V Answer: C Explanation: Class 2 circuits are limited to 60 V DC or 30 V RMS AC. Question 41. In Hawaii, the Board of Electricians requires a Journey Worker Electrician (EJ) to: A) Work unsupervised on any job
Ultimate Exam
Answer: B Explanation: Hawaii requires CE renewal every two years for Journey Worker Electricians. Question 44. The minimum conduit size to pull three #4 AWG THHN conductors plus a #12 AWG EGC is: A) 1/2 in. B) 3/4 in. C) 1 in. D) 1 1/4 in. Answer: B Explanation: Using Table 1 of Chapter 9, a 3/4 in. EMT can accommodate three #4 AWG plus a #12 AWG conductor. Question 45. A feeder supplying a 120/240 V single-phase load of 20 kW with a power factor of 0.9 requires a minimum conductor size of: A) #6 AWG copper B) #4 AWG copper C) #2 AWG aluminum D) #8 AWG copper Answer: B
Ultimate Exam
Explanation: Real power = 20 kW; apparent power = 20 kW / 0.9 ≈ 22.2 kVA. Using 240 V, current ≈ 92.5 A. #4 AWG copper (115 A) is sufficient. Question 46. The NEC requires that a disconnecting means for a motor be located: A) Within 6 ft of the motor starter B) At the same location as the motor control center only C) Within sight of the motor location D) No specific location is required Answer: C Explanation: NEC 430.102 requires the disconnect to be within sight of the motor. Question 47. The correct method to size a motor overload for a motor with a service factor of 1.15 and FLA of 25 A is: A) Use 125 % of FLA B) Use 115 % of FLA C) Use the service factor multiplied by 125 % of FLA D) Use the service factor multiplied by 115 % of FLA Answer: C Explanation: Overload must be set at 125 % of the motor’s full-load current; the service factor is already accounted for in the nameplate current. Therefore, 125 % × (25 A × 1.15) = 143.75 A.
