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2008 Ultimate Exam
Question 1. Which of the following equations correctly represents Ohm’s Law for a DC circuit? A) V = I × R B) I = V × R C) R = V ÷ I² D) V = I ÷ R Answer: A Explanation: Ohm’s Law states that voltage (V) equals current (I) multiplied by resistance (R). Question 2. A 120 V circuit supplies a load drawing 10 A. What is the power consumed by the load? A) 12 W B) 120 W C) 1,200 W D) 12,000 W Answer: C Explanation: Power (P) = V × I = 120 V × 10 A = 1,200 W. Question 3. In a series circuit with three resistors of 4 Ω, 6 Ω, and 10 Ω, what is the total resistance? A) 4 Ω B) 6 Ω C) 10 Ω D) 20 Ω
2008 Ultimate Exam
Answer: D Explanation: Series resistance adds: 4 Ω + 6 Ω + 10 Ω = 20 Ω. Question 4. Two 120 V loads are connected in parallel across a 120 V source. If each load draws 5 A, what is the total current supplied by the source? A) 5 A B) 10 A C) 15 A D) 20 A Answer: B Explanation: Parallel currents add: 5 A + 5 A = 10 A. Question 5. Convert 5 kW to horsepower (HP). (1 HP = 746 W) A) 5.7 HP B) 6.7 HP C) 7.2 HP D) 8.5 HP Answer: B Explanation: 5 kW = 5,000 W ÷ 746 W/HP ≈ 6.7 HP. Question 6. A 150-ft run of 12 AWG copper conductors has a voltage drop of 2 % when supplying a 20 A load at 120 V. What is the approximate voltage at the load? A) 117.6 V B) 118.4 V
2008 Ultimate Exam
A) 24 in. wide, 30 in. deep, 36 in. high B) 30 in. wide, 36 in. deep, 48 in. high C) 30 in. wide, 36 in. deep, 36 in. high D) 36 in. wide, 48 in. deep, 60 in. high Answer: C Explanation: NEC requires a minimum of 30 in. wide, 36 in. deep, and 36 in. high clearance. Question 10. Which of the following is required for guarding live parts of equipment? A) Insulated covers only B) Physical barriers that prevent accidental contact C) Warning signs only D) None of the above Answer: B Explanation: Physical barriers (guards) must be installed to prevent accidental contact with energized parts. Question 11. In residential wiring, which color indicates a grounded (neutral) conductor? A) Black B) Red C) White D) Green Answer: C
2008 Ultimate Exam
Explanation: White (or gray) is the standard color for neutral conductors. Question 12. An AFCI is required in which of the following locations? A) Kitchen countertop receptacles B) Bedroom branch circuits C) Outdoor lighting circuits D) Garage door opener circuits Answer: B Explanation: NEC requires AFCI protection for bedroom circuits to prevent arc-fault fires. Question 13. Which device provides protection against ground-fault currents up to 30 mA? A) Standard circuit breaker B) GFCI receptacle C) Surge protector D) Thermal overload relay Answer: B Explanation: GFCI devices trip when ground-fault currents exceed 30 mA. Question 14. A single-family dwelling has a calculated load of 48 kVA. What minimum service size (in amperes) is required at 240 V? A) 100 A B) 150 A
2008 Ultimate Exam
Question 17. Which overcurrent device must be used to protect a 20 A branch circuit supplying a kitchen countertop receptacle? A) 15 A breaker B) 20 A breaker C) 30 A breaker D) 40 A breaker Answer: B Explanation: The circuit must be protected by a breaker not exceeding the circuit’s ampacity, i.e., 20 A. Question 18. When more than three current-carrying conductors are installed in a raceway, the ampacity must be derated. What is the derating factor for four conductors (based on NEC Table 310.15(B)(3)(a))? A) 100 % B) 80 % C) 70 % D) 60 % Answer: B Explanation: For 4-6 conductors, the derating factor is 80 %. Question 19. What is the maximum number of 14-AWG conductors allowed in a ½-in. EMT conduit (assuming 40 % fill)? A) 9 B) 12 C) 15
2008 Ultimate Exam
D) 18
Answer: B Explanation: ½-in. EMT has a 40 % fill area of 0.213 in². Each 14-AWG conductor occupies 0.0133 in², allowing roughly 16 conductors; however, NEC rounding limits to 12 for practical fill. Question 20. Which conduit type is permitted for use in wet locations without a moisture barrier? A) Rigid Metal Conduit (RMC) B) Electrical Metallic Tubing (EMT) C) Flexible Metal Conduit (FMC) D) Non-metallic raceway (PVC) Answer: A Explanation: RMC is listed for wet locations; EMT is not permitted unless listed for wet use. Question 21. For a motor rated 5 HP, 240 V, 3-phase, what is the minimum size copper conductor for the branch circuit (assuming 75 °C rating)? A) #8 AWG B) #6 AWG C) #4 AWG D) #2 AWG Answer: C Explanation: NEC Table 430.250 indicates #4 AWG copper is required for a 5 HP, 240 V motor.
2008 Ultimate Exam
C) Flexible cord with a grounded (3-wire) plug D) All of the above Answer: B Explanation: Light-duty (typically 18-AWG) cords are not intended for permanent wiring. Question 25. According to Montana State Statutes, a journeyman electrician may supervise how many apprentices on a single job site? A) One B) Two C) Three D) Four Answer: C Explanation: Montana statutes limit a journeyman to supervising no more than three apprentices simultaneously. Question 26. When must a permit be obtained for electrical work in Montana? A) Only for new residential construction B) For any alteration, addition, or repair that affects wiring C) Only for commercial projects over $5, D) Never, permits are optional Answer: B Explanation: Montana requires a permit for any work that modifies the electrical system.
2008 Ultimate Exam
Question 27. Which of the following is the correct method for grounding a metal conduit system? A) Only ground the conduit at the service entrance. B) Ground each conduit run at every connection point. C) Use a grounding electrode conductor attached to the conduit at the source and at each outlet box. D) No grounding is required for metal conduit. Answer: C Explanation: NEC requires the conduit to be bonded at the source and at each box to maintain a low-impedance path. Question 28. In a Class II (dust) hazardous location, which type of conduit is acceptable? A) Rigid Metal Conduit (RMC) only B) Non-metallic conduit with a flame-retardant jacket C) Flexible Metal Conduit (FMC) with a dust-tight fitting D) Any conduit listed for Class II use Answer: D Explanation: NEC permits any conduit specifically listed for Class II hazardous locations. Question 29. What is the required GFCI protection for a pool pump motor circuit? A) No GFCI required B) 30-mA GFCI breaker only
2008 Ultimate Exam
Question 32. Which of the following is the correct ampacity for a 3-wire, 12-AWG copper NM cable in a 30 °C ambient temperature (75 °C rating) without derating? A) 15 A B) 20 A C) 25 A D) 30 A Answer: B Explanation: 12-AWG copper NM cable is rated for 20 A at 75 °C. Question 33. When installing a 4-inch EMT conduit, what is the maximum distance between supports? A) 3 ft B) 6 ft C) 10 ft D) 12 ft Answer: C Explanation: NEC 358.30 allows EMT supports at intervals not exceeding 10 ft. Question 34. Which of the following is the correct method to calculate box fill for a device box containing three #12 AWG conductors, one grounding conductor, and a device? A) Count each conductor as one volume unit. B) Count each insulated conductor as one unit, grounding conductor as ½ unit, and the device as two units.
2008 Ultimate Exam
C) Count each insulated conductor as one unit, grounding conductor as one unit, and the device as one unit. D) Count each insulated conductor as one unit, grounding conductor as ½ unit, and the device as one unit. Answer: D Explanation: NEC 314.16(B) specifies that each insulated conductor counts as one volume unit, the equipment grounding conductor counts as ½ unit, and each device counts as one unit. Question 35. A commercial kitchen uses a 30-amp dedicated circuit for a commercial range. Which type of overcurrent protection is required? A) Standard 30-amp breaker B) 30-amp GFCI breaker C) 30-amp AFCI breaker D) 40-amp breaker with a 30-amp fuse downstream Answer: A Explanation: A dedicated circuit for a range requires standard overcurrent protection; GFCI/AFCI is not required in this location. Question 36. Which of the following is a permissible method for bonding a metal water pipe to the grounding electrode system? A) Using a 2-wire cable clamp only B) Using a listed bonding jumper of appropriate size C) Taping the pipe to the grounding electrode conductor D) No bonding is required if the pipe is insulated Answer: B
2008 Ultimate Exam
C) Article 334 D) Article 376 Answer: A Explanation: Article 352 covers Flexible Metal Conduit. Question 40. A 1500 W electric baseboard heater is installed on a 120 V circuit. What minimum circuit ampacity (MCA) is required? A) 10 A B) 12.5 A C) 15 A D) 20 A Answer: C Explanation: Load = 1500 W ÷ 120 V = 12.5 A. Apply 125 % factor: 12.5 A × 1.25 = 15.6 A → round up to next standard size, 20 A. However, MCA is 15 A (since the 125 % of 12.5 A is 15.6 A, the next standard breaker is 20 A, but the MCA used for conductor sizing is 15 A). The answer is 15 A for conductor sizing; the breaker would be 20 A. Question 41. Which of the following is required for a receptacle installed in a bathtub or shower stall? A) GFCI protection only B) AFCI protection only C) Both GFCI and AFCI protection D) No special protection required Answer: A
2008 Ultimate Exam
Explanation: NEC requires GFCI protection for receptacles in bathtubs or showers. Question 42. In a three-wire branch circuit (hot-hot-neutral), what is the correct color coding for the neutral conductor? A) Black B) Red C) White or gray D) Green Answer: C Explanation: Neutral must be white or gray. Question 43. Which of the following devices is used to protect a motor against short-circuit and overload conditions? A) GFCI breaker B) Thermal overload relay C) AFCI breaker D) Surge protector Answer: B Explanation: Thermal overload relays protect motors from overload; short-circuit protection is provided by a circuit breaker. Question 44. A 250 V, 30 A dryer circuit requires a minimum conductor size of: A) #12 AWG copper B) #10 AWG copper
2008 Ultimate Exam
Question 47. Which of the following is the correct definition of a “feeder” according to the NEC? A) A circuit that supplies power to a single receptacle B) A set of conductors that originate at a service equipment and supply one or more distribution panels C) Any wiring that connects a light fixture to a switch D) A branch circuit that powers appliances only Answer: B Explanation: A feeder distributes power from service equipment to sub-panels or other distribution equipment. Question 48. In a health-care facility, which type of grounding system is required for patient care areas? A) Standard grounding electrode system only B) Isolated grounding system with a separate grounding electrode C) No grounding is required in patient rooms D) Bonded grounding system with a single point only Answer: B Explanation: NEC Article 517 requires isolated grounding for patient care areas to reduce electrical noise. Question 49. Which of the following statements about a “bonding jumper” is correct? A) It connects the neutral to earth at the service panel. B) It provides a low-impedance path between metal parts that could become energized.
2008 Ultimate Exam
C) It is used only for grounding electrode conductors. D) It must be larger than the largest ungrounded conductor. Answer: B Explanation: A bonding jumper ties together conductive parts to ensure a low-impedance fault path. Question 50. The NEC requires that a disconnecting means for a single-family dwelling be installed within how many feet of the service equipment? A) 5 ft B) 10 ft C) 25 ft D) No distance requirement Answer: B Explanation: NEC 230.71 requires the disconnect to be readily accessible, typically within 10 ft of the service equipment. Question 51. Which of the following is the correct ampacity for a 3-wire, 10-AWG aluminum SER cable in a 30 °C ambient temperature (75 °C rating) without derating? A) 30 A B) 35 A C) 40 A D) 45 A Answer: B Explanation: 10-AWG aluminum SER is rated for 35 A at 75 °C.
