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Question 1. What is the relationship between current, voltage, and resistance as defined by Ohm’s Law? A) V = I × R B) V = R ÷ I C) V = I ÷ R D) V = R × I² Answer: A Explanation: Ohm’s Law states that Voltage (V) equals Current (I) multiplied by Resistance (R). Question 2. Which term describes the rate at which electrical energy is transferred by an electric circuit? A) Capacitance B) Inductance C) Power D) Resistance Answer: C Explanation: Power is the rate of electrical energy transfer, measured in watts. Question 3. In a series circuit, how does the current behave? A) It splits equally between components B) It is the same through all components C) It increases through each component D) It decreases through each component Answer: B Explanation: In a series circuit, the same current flows through every component. Question 4. The total resistance in a parallel circuit is always A) Greater than any single branch resistance B) Equal to the highest resistance C) Less than the smallest branch resistance D) Equal to the sum of all resistances
Answer: C Explanation: In parallel, total resistance decreases and is always less than the smallest individual resistance. Question 5. Which law states that the sum of voltages around a closed loop equals zero? A) Coulomb’s Law B) Kirchhoff’s Voltage Law C) Faraday’s Law D) Lenz’s Law Answer: B Explanation: Kirchhoff’s Voltage Law states the sum of all voltages in a closed loop is zero. Question 6. What is the primary function of a transformer? A) Store electrical charge B) Convert DC to AC C) Increase or decrease AC voltage D) Measure electrical current Answer: C Explanation: Transformers are used to step up or step down AC voltages. Question 7. What is the unit of electrical resistance? A) Volt B) Ampere C) Watt D) Ohm Answer: D Explanation: The ohm is the standard unit for measuring resistance. Question 8. Which device converts electrical energy into mechanical energy?
Answer: B Explanation: An ammeter measures electric current. Question 12. What is the main purpose of grounding electrical systems? A) Increase voltage B) Prevent overloading C) Provide a path for fault current D) Decrease current Answer: C Explanation: Grounding provides a safe path for fault current to reduce shock hazards. Question 13. Which NEC Article covers the identification of grounded conductors? A) Article 210 B) Article 200 C) Article 250 D) Article 300 Answer: B Explanation: Article 200 covers requirements for identifying grounded conductors. Question 14. According to NEC, what is the minimum depth for burying a direct burial cable under a residential driveway? A) 6 inches B) 12 inches C) 18 inches D) 24 inches Answer: D Explanation: NEC Table 300.5 specifies 24 inches under driveways for direct burial cable.
Question 15. Which color is typically used to identify the grounded (neutral) conductor in residential wiring? A) Black B) Green C) White D) Red Answer: C Explanation: White or gray is used for grounded (neutral) conductors. Question 16. What is the main function of a circuit breaker? A) Increase voltage B) Store energy C) Protect against overcurrent D) Supply power Answer: C Explanation: Circuit breakers automatically open circuits during overcurrent conditions. Question 17. What type of receptacle is required in bathrooms according to NEC? A) 15A standard B) 20A GFCI C) 30A twist lock D) 10A GFCI Answer: B Explanation: Bathrooms require 20A GFCI-protected receptacles for safety. Question 18. Which of the following is NOT a common type of raceway? A) EMT B) PVC conduit C) MC cable
Question 22. What does GFCI stand for? A) Grounded Fault Circuit Interrupter B) Ground Fault Circuit Interrupter C) General Fault Circuit Indicator D) Grounded Flexible Cable Interrupter Answer: B Explanation: GFCI protects against ground faults by monitoring current imbalance. Question 23. What is the minimum rating for general purpose branch circuit overcurrent protection in a dwelling unit? A) 10A B) 15A C) 20A D) 25A Answer: B Explanation: 15A is the minimum rating for general lighting branch circuits. Question 24. Which of the following must be bonded together in an electrical system? A) Neutral and hot B) Equipment grounding conductor and neutral at subpanel C) Grounding electrode conductor and service neutral at main panel D) Hot and grounding conductor Answer: C Explanation: At the main panel, the grounding electrode conductor and neutral must be bonded. Question 25. What is the maximum number of 12 AWG conductors permitted in a standard 4-inch square, 2-1/8 inch deep box? A) 6
B) 9
C) 12
D) 15
Answer: B Explanation: Using box fill calculations, 9 conductors fit that box size. Question 26. What is the allowable ampacity of a 12 AWG copper conductor with THHN insulation at 75°C? A) 15A B) 20A C) 25A D) 30A Answer: B Explanation: NEC Table 310.16 gives 20A for 12 AWG THHN at 75°C. Question 27. What is the minimum burial depth for rigid metal conduit under a sidewalk? A) 6 inches B) 12 inches C) 18 inches D) 24 inches Answer: B Explanation: NEC Table 300.5 specifies 12 inches for RMC under sidewalks. Question 28. Which NEC Article covers branch circuits? A) Article 100 B) Article 210 C) Article 250 D) Article 300 Answer: B
B) Series-wound DC motor C) Split-phase induction motor D) Universal motor Answer: D Explanation: Universal motors operate on AC or DC and are common in appliances. Question 33. The voltage rating of a branch circuit receptacle must be A) Less than the circuit voltage B) Equal to or greater than the circuit voltage C) Higher than the circuit voltage D) Unrelated to circuit voltage Answer: B Explanation: Receptacle voltage rating must meet or exceed circuit voltage. Question 34. Which wiring method is not permitted in wet locations? A) PVC conduit B) NM cable C) Rigid metal conduit D) Liquidtight flexible conduit Answer: B Explanation: NM cable is for dry locations only. Question 35. What is used to protect conductors from abrasion where they pass through metal studs? A) Tape B) Bushings or grommets C) Wire nuts D) Insulation Answer: B Explanation: Bushings or grommets prevent wire insulation from being damaged.
Question 36. Which of the following is NOT a function of a capacitor in an electrical circuit? A) Store electrical energy B) Block DC current C) Filter signals D) Increase resistance Answer: D Explanation: Capacitors store energy, block DC, and filter signals, but do not add resistance. Question 37. Which device is used to open or close a circuit manually? A) Circuit breaker B) Switch C) Transformer D) Relay Answer: B Explanation: Switches are designed for manual operation of circuits. Question 38. Which code section covers the installation of luminaries (lighting fixtures)? A) Article 400 B) Article 410 C) Article 420 D) Article 430 Answer: B Explanation: Article 410 covers luminaires, lampholders, and lamps. Question 39. What is the minimum required capacity for a dwelling unit’s service disconnect per NEC? A) 60A B) 100A C) 125A
A) Increased wire size B) Decreased wire length C) Small wire gauge and long runs D) Use of GFCI Answer: C Explanation: Smaller wire and longer distances cause greater voltage drop. Question 44. What is the maximum continuous load permitted on a circuit breaker rated at 100A? A) 60A B) 70A C) 80A D) 100A Answer: C Explanation: Maximum continuous load is 80% of breaker rating (80A for 100A). Question 45. Which NEC Article covers overcurrent protection? A) Article 240 B) Article 430 C) Article 210 D) Article 250 Answer: A Explanation: Article 240 covers overcurrent protection devices. Question 46. How often must GFCIs be tested, according to the manufacturer’s instructions? A) Monthly B) Weekly C) Annually D) Every two years Answer: A
Explanation: Manufacturers recommend monthly testing of GFCIs. Question 47. What is the minimum required clearance from the bottom of a pool to overhead service conductors? A) 10 feet B) 12 feet C) 18 feet D) 22.5 feet Answer: D Explanation: NEC requires a minimum of 22.5 feet above pools for overhead conductors. Question 48. Which of the following is a requirement for a receptacle in a kitchen countertop? A) GFCI protection B) AFCI protection C) Dedicated 30A circuit D) Isolated ground Answer: A Explanation: All kitchen countertop receptacles must be GFCI protected. Question 49. What is the main purpose of a transformer’s core? A) Increase resistance B) Provide a path for magnetic flux C) Store electrical energy D) Measure current Answer: B Explanation: The core enhances magnetic coupling between windings. Question 50. What is the minimum conductor size for a grounding electrode conductor to a ground rod? A) 14 AWG
Explanation: The grounding electrode conductor must be continuous, except for irreversible connections. Question 54. What is the typical voltage for residential branch circuits in the US? A) 120V B) 208V C) 240V D) 277V Answer: A Explanation: Standard branch circuits in residences are 120V. Question 55. Which of the following is an acceptable method for splicing conductors in a junction box? A) Twisting and taping B) Soldering and taping C) Wire connectors (wire nuts) D) All of the above Answer: D Explanation: All listed methods are acceptable if properly done. Question 56. What is the minimum clearance required between a luminaire and a storage area in a clothes closet? A) 3 inches B) 6 inches C) 12 inches D) 18 inches Answer: D Explanation: NEC requires luminaires be at least 18 inches from storage spaces in closets. Question 57. Which type of circuit configuration is used for home lighting circuits?
A) Parallel B) Series C) Series-parallel D) None of the above Answer: A Explanation: Parallel circuits are used so lights operate independently. Question 58. The symbol “∆” is used to represent which type of motor winding configuration? A) Wye B) Delta C) Series D) Parallel Answer: B Explanation: “∆” denotes the delta configuration. Question 59. What is the NEC required minimum size for a service disconnecting means in a one-family dwelling? A) 30A B) 50A C) 60A D) 100A Answer: D Explanation: 100A is the minimum per NEC for dwellings. Question 60. Which of the following is a characteristic of three-phase power? A) Single voltage waveform B) Constant power transfer C) Used only for lighting D) Used only in homes
A) GFCI
B) AFCI
C) Surge protection D) Isolated ground Answer: A Explanation: Outdoor receptacles must have GFCI protection. Question 65. What is the function of a thermal overload relay in a motor circuit? A) Increase current B) Monitor voltage C) Protect against overheating D) Store charge Answer: C Explanation: Overload relays protect motors from excessive heat due to overloads. Question 66. What is the maximum number of 14 AWG conductors allowed in a 4-inch octagonal box (1- 1/2 in. deep)? A) 6 B) 8 C) 10 D) 12 Answer: A Explanation: Box fill calculations allow for 6 conductors in this size. Question 67. Which NEC Article addresses hazardous locations? A) Article 500 B) Article 310 C) Article 250 D) Article 400
Answer: A Explanation: Article 500 covers hazardous (classified) locations. Question 68. Which of the following is required for a feeder supplying a subpanel in a detached garage? A) Equipment grounding conductor B) Water pipe bond C) Two neutral conductors D) Isolated ground Answer: A Explanation: An equipment grounding conductor is required to subpanels in outbuildings. Question 69. What is the minimum size copper conductor required for a 20A branch circuit? A) 10 AWG B) 12 AWG C) 14 AWG D) 16 AWG Answer: B Explanation: 12 AWG copper is required for 20A circuits. Question 70. Which of the following best describes impedance? A) Resistance in DC circuits only B) Opposition to AC current, including resistance and reactance C) Voltage drop in a circuit D) Power factor in AC circuits Answer: B Explanation: Impedance is total opposition to AC, combining resistance and reactance. Question 71. What must be done to a grounding electrode conductor when run through a metal conduit?
