Download UTAH RJEME Residential Journeyman Electrician Exam and more Exams Technology in PDF only on Docsity!
Electrician Exam
Question 1. Which document primarily governs the safe installation and wiring of electrical systems in residential buildings in Utah? A) Local building codes only B) National Electrical Code (NEC) with Utah amendments C) International Building Code (IBC) D) OSHA regulations Answer: B Explanation: The NEC, supplemented by Utah amendments, is the primary code that governs electrical installations in residential buildings to ensure safety and compliance. Question 2. In the NEC, what is the primary purpose of the "Authority Having Jurisdiction" (AHJ)? A) To enforce building permits B) To approve electrical plans and inspect installations C) To design electrical systems D) To sell electrical equipment Answer: B Explanation: The AHJ is responsible for enforcing codes, issuing permits, and inspecting electrical work to ensure compliance with standards.
Electrician Exam
Question 3. Which rule type in the NEC is mandatory and must be followed? A) Permissive B) Advisory C) Mandatory D) Optional Answer: C Explanation: Mandatory rules are those that are required to be followed; they are enforceable, unlike permissive rules which are optional. Question 4. Which of the following best defines a "dwelling unit" as per NEC terminology? A) A building with multiple apartments B) A single-family residence, including a detached, semi-detached, or row house C) Any commercial building with residential components D) A temporary shelter Answer: B
Electrician Exam
Explanation: NEC requires GFCI protection for outlets serving kitchen countertops to prevent electrical shock hazards. Question 7. What is the minimum number of 20-amp small-appliance branch circuits required in a dwelling unit? A) One B) Two C) Three D) Four Answer: B Explanation: The NEC typically requires at least two separate 20-amp small-appliance circuits for kitchen outlets to ensure sufficient capacity and safety. Question 8. Which receptacle location is NOT typically required by the NEC in a residential garage? A) Within 6 feet of a sink B) At each vehicle parking area C) GFCI protected receptacles D) Receptacles outside the garage
Electrician Exam
Answer: A Explanation: Receptacles within 6 feet of a sink are generally not required in garages, but GFCI protection and outdoor outlets are mandated. Question 9. GFCI protection is required for outdoor receptacles in which of the following locations? A) Only in commercial properties B) All outdoor receptacles in residential settings C) Receptacles inside the house only D) Receptacles in unfinished basements only Answer: B Explanation: The NEC mandates GFCI protection for all outdoor receptacles in residential settings to prevent shock hazards. Question 10. AFCI protection is required in which areas of a dwelling? A) Bathrooms and kitchens B) Bedrooms and living rooms C) Garages and basements D) Outdoors
Electrician Exam
Answer: C Explanation: NEC box fill calculations consider conductor volume; a 15 cu. in. box can typically accommodate up to 8 conductors, depending on size. Question 13. Which type of cable is most suitable for underground residential wiring exposed to moisture? A) NM cable B) UF cable C) MC cable D) AC cable Answer: B Explanation: UF (Underground Feeder) cable is designed for underground use and exposure to moisture. Question 14. Which of the following is an allowable use for MC (Metal Clad) cable in residential wiring? A) Running exposed in open areas outdoors without protection B) Concealed within walls and ceilings C) As a substitute for non-metallic sheathed cable outside D) For direct burial underground
Electrician Exam
Answer: B Explanation: MC cable is suitable for concealed wiring within walls and ceilings, providing protection and ease of installation. Question 15. When installing conduit in a residential setting, what is the minimum bending radius generally recommended? A) Equal to the diameter of the conduit B) Twice the diameter of the conduit C) Three times the diameter of the conduit D) Four times the diameter of the conduit Answer: B Explanation: The NEC recommends a minimum bending radius of at least twice the conduit diameter to prevent damage and ensure ease of pulling conductors. Question 16. Which type of conduit is most resistant to physical damage and suitable for outdoor residential applications? A) EMT B) PVC C) RMC
Electrician Exam
D) All of the above Answer: D Explanation: The NEC allows various grounding electrodes, including water pipes, rebar, and metal framing, provided they meet specific criteria. Question 19. What size grounding electrode conductor is generally required for a typical residential service? A) 8 AWG B) 6 AWG C) 4 AWG D) 2 AWG Answer: B Explanation: For a residential service, a 6 AWG copper grounding electrode conductor is commonly used, subject to specific system size requirements. Question 20. Which device is used to disconnect power to a specific circuit or appliance for safety or maintenance? A) Circuit breaker
Electrician Exam
B) Fuse C) Disconnect switch D) All of the above Answer: D Explanation: All listed devices serve as disconnecting means—circuit breakers and fuses protect circuits, while disconnect switches isolate circuits or appliances. Question 21. Which of the following is a common rated voltage for residential branch circuits in Utah? A) 120/240 V B) 277 V C) 480 V D) 240 V only Answer: A Explanation: The standard residential supply voltage in Utah and most of the U.S. is 120/240 V single-phase. Question 22. Which material is commonly used for residential branch circuit conductors?
Electrician Exam
A) It prevents overcurrent conditions B) It detects and disconnects arcing faults that could cause fires C) It provides ground-fault protection D) It is only required outdoors Answer: B Explanation: AFCI devices detect arcing faults, which are a common cause of electrical fires, and disconnect power to prevent ignition. Question 25. What is the typical overcurrent protection device rating for branch circuits supplying lighting and receptacles? A) 15 or 20 amps B) 30 amps C) 40 amps D) 50 amps Answer: A Explanation: Standard branch circuit protection for lighting and receptacles is either 15 or 20 amps, depending on circuit load and wiring. Question 26. Which type of conductor color code indicates a grounding conductor in residential wiring?
Electrician Exam
A) Black or red B) White or gray C) Green or bare copper D) Blue or yellow Answer: C Explanation: Green or bare copper conductors are designated as grounding conductors in residential wiring. Question 27. What is the maximum number of conductors allowed in a standard 20 cubic-inch device box according to NEC box fill rules? A) 4 conductors B) 6 conductors C) 8 conductors D) 10 conductors Answer: B Explanation: A 20 cu. in. box generally accommodates up to 6 conductors, considering conductor volume and device fill rules. Question 28. Which type of wiring method is least suitable for outdoor residential applications without additional protection?
Electrician Exam
A) Article 250 B) Article 300 C) Article 410 D) Article 430 Answer: A Explanation: Article 250 of the NEC addresses grounding and bonding requirements for electrical systems. Question 31. When planning a residential wiring project, what is the most important factor in conductor sizing? A) Length of the circuit B) Color of the wire C) Type of conduit D) Number of outlets Answer: A Explanation: The length of the circuit affects voltage drop and conductor size, making it a critical factor in proper sizing. Question 32. Which is a common use of a step-down transformer in residential systems?
Electrician Exam
A) To reduce 120/240 V to 24 V for doorbells B) To increase voltage for appliances C) To convert AC to DC D) To protect against surges Answer: A Explanation: Step-down transformers are used in residential applications like doorbells to reduce voltage from standard supply levels. Question 33. What is the primary function of a GFCI device in residential electrical systems? A) To prevent overcurrent B) To detect ground faults and disconnect power C) To provide surge protection D) To regulate voltage Answer: B Explanation: GFCIs detect ground faults and quickly disconnect power to prevent electrical shocks. Question 34. Which statement best describes the NEC’s requirement for receptacles in bathrooms?
Electrician Exam
A) To allow safe disconnection for maintenance and emergency B) To increase circuit capacity C) To prevent overcurrent D) To serve as a surge protector Answer: A Explanation: Disconnecting means enable safe maintenance and emergency disconnection of appliances from the supply. Question 37. Which of the following wiring methods is most commonly used for indoor residential branch circuits? A) NM cable (Romex) B) Rigid metal conduit C) Liquid-tight flexible conduit D) PVC conduit Answer: A Explanation: NM cable, such as Romex, is the most common wiring method for indoor residential circuits due to its ease of use and cost- effectiveness.
Electrician Exam
Question 38. In residential wiring, what is the typical purpose of a receptacle with a GFCI feature? A) To prevent overloads B) To protect against ground faults and reduce shock risk C) To improve energy efficiency D) To increase current capacity Answer: B Explanation: GFCI receptacles detect ground faults and quickly disconnect power, reducing the risk of electrical shock. Question 39. For a 15-amp residential branch circuit, what is the maximum conductor size allowed? A) 14 AWG B) 12 AWG C) 10 AWG D) 8 AWG Answer: A Explanation: 14 AWG conductors are rated for 15-amp circuits according to NEC ampacity rules.
