Download South Dakota Electrician, Journeyman Exam and more Exams Technology in PDF only on Docsity!
Exam
Question 1. What does Ohm's Law state? A) Voltage equals current times resistance B) Power equals voltage times current C) Resistance equals voltage divided by current D) Current equals resistance divided by voltage Answer: A Explanation: Ohm's Law states that Voltage (V) equals current (I) times resistance (R), which is fundamental for calculating electrical parameters in circuits. Question 2. Which component symbol represents a resistor in circuit diagrams? A) A zigzag line
Exam
B) A rectangle C) A circle with a diagonal line D) A straight line Answer: A Explanation: The zigzag line symbol is universally used to represent resistors in electrical schematics. Question 3. In a series circuit, what happens to the total resistance? A) It remains the same B) It decreases C) It increases D) It is the sum of all resistances
Exam
Question 5. What is the primary purpose of a ground-fault circuit interrupter (GFCI)? A) To prevent overloads B) To protect against ground faults C) To switch circuits on and off D) To regulate voltage Answer: B Explanation: GFCIs detect leakage currents to ground and shut off power, protecting people from electrical shock. Question 6. Which unit measures electrical energy? A) Volt
Exam
B) Watt C) Joule D) Kilowatt-hour Answer: D Explanation: Kilowatt-hour (kWh) measures electrical energy consumption over time. Question 7. What is the typical color coding for grounding conductors in the NEC? A) Black B) Red C) Green or bare copper D) White
Exam
Question 9. What does a capacitor symbol look like in a circuit diagram? A) Two parallel lines with a gap B) A zigzag line C) A circle with a plus and minus sign D) A rectangle with a winding Answer: A Explanation: Capacitors are represented by two parallel lines with a gap between them. Question 10. Which NEC article covers conductors and their ampacity? A) Article 310
Exam
B) Article 250 C) Article 400 D) Article 110 Answer: A Explanation: Article 310 addresses conductors, their insulation, and ampacity ratings. Question 11. When reading electrical schematics, what does a dashed line typically indicate? A) Power source B) Hidden wiring or control circuit C) Ground connection D) Neutral wire
Exam
Question 13. What is the main function of a transformer? A) To convert AC to DC B) To increase or decrease voltage levels C) To store electrical energy D) To protect against overcurrent Answer: B Explanation: Transformers change voltage levels to meet electrical system requirements. Question 14. Which test equipment is used to measure resistance in a circuit? A) Multimeter set to ohms B) Clamp-on ammeter
Exam
C) Megohmmeter D) Oscilloscope Answer: C Explanation: Megohmmeters measure high resistance, useful for insulation testing. Question 15. Which symbol represents a switch in a circuit diagram? A) A circle with a line B) An open gap with a line C) A zigzag line D) A rectangle Answer: B
Exam
Question 17. Which type of wiring method is generally used for underground electrical installations? A) Non-metallic sheathed cable (NM cable) B) Rigid metal conduit (RMC) C) Flexible cord D) Surface-mounted raceways Answer: B Explanation: Rigid metal conduit is suitable for underground wiring due to its durability and protection. Question 18. According to NEC, what is the maximum number of conductors allowed in a conduit based on fill capacity? A) 40%
Exam
B) 50%
C) 75%
D) 100%
Answer: B Explanation: The NEC generally limits conduit fill to 50% of the internal cross-sectional area for conductors. Question 19. Which of the following is a typical application for a motor controller? A) To switch lights on and off B) To start, stop, and protect motors C) To measure current flow D) To regulate voltage
Exam
Question 21. Which of the following best describes the function of a multi-wire branch circuit? A) It supplies multiple loads from different phases using the same conduit B) It reduces voltage in a circuit C) It isolates ground faults D) It provides a backup power source Answer: A Explanation: Multi-wire branch circuits use multiple hot conductors from different phases to supply loads, improving efficiency. Question 22. In a residential wiring system, what is the typical minimum height for receptacles in kitchen counters?
Exam
A) 12 inches B) 15 inches C) 18 inches D) 20 inches Answer: C Explanation: NEC recommends receptacles be installed not less than 18 inches above the countertop surface. Question 23. When installing conduit bends, what is the recommended minimum radius? A) Equal to the conduit diameter B) Twice the conduit diameter C) Half the conduit diameter
Exam
Explanation: GFCI protection is required for all outlets in bathrooms to prevent shocks. Question 25. What is the purpose of a bonding jumper? A) To connect grounded parts to the grounding system B) To carry current in normal operation C) To disconnect the circuit during faults D) To measure current flow Answer: A Explanation: Bonding jumpers connect conductive parts to ensure proper grounding and fault clearing.
Exam
Question 26. In the NEC, what is the purpose of an arc-fault circuit interrupter (AFCI)? A) To prevent overloads B) To detect and disconnect arc faults C) To regulate voltage D) To protect against ground faults Answer: B Explanation: AFCIs detect arcing conditions that could lead to fires and disconnect power to prevent hazards. Question 27. Which symbol indicates a lighting fixture in electrical schematics? A) A circle with a cross inside
