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Exam for electricians specialized in specific systems (fire alarms, HVAC, communications). Tests NEC knowledge, troubleshooting, installation, and safety.
Typology: Exams
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Question 1. What is the unit of electrical resistance? A) Ampere B) Volt C) Ohm D) Watt Answer: C Explanation: The ohm is the standard unit for measuring electrical resistance. Question 2. Which law states that current is directly proportional to voltage and inversely proportional to resistance? A) Newton’s Law B) Ohm’s Law
C) Faraday’s Law D) Coulomb’s Law Answer: B Explanation: Ohm’s Law (V = IR) states this relationship between voltage, current, and resistance. Question 3. What is the primary purpose of personal protective equipment (PPE) in electrical work? A) Improve efficiency B) Reduce arc flash hazards C) Meet scheduling requirements D) Increase voltage Answer: B
Question 5. What does a GFCI device primarily protect against? A) Overvoltage B) Electric shock C) Overcurrent D) Lightning Answer: B Explanation: GFCIs protect people from electric shock due to ground faults. Question 6. Which of the following is the formula for calculating electrical power in a DC circuit? A) P = V/I B) P = I^2 / R
Answer: C Explanation: Power is the product of voltage and current (P = VI) in a DC circuit. Question 7. Which device is used to test insulation resistance? A) Clamp meter B) Megohmmeter C) Voltmeter D) Ammeter Answer: B
Question 9. What is the minimum depth requirement for underground electrical conduit according to the NEC for circuits rated 120V or less and protected by GFCI? A) 6 inches B) 12 inches C) 18 inches D) 24 inches Answer: C Explanation: The NEC generally requires 18 inches minimum for such installations. Question 10. Which of the following is a continuous load as defined by the NEC?
A) A load that operates for 30 minutes B) A load that operates for 1 hour C) A load that operates for 3 hours or more D) A load that operates for 10 minutes Answer: C Explanation: NEC defines continuous load as one expected to run for 3 hours or more. Question 11. When using a clamp meter, what type of electrical quantity is being measured? A) Resistance B) Voltage C) Current
Explanation: Rigid Metal Conduit (RMC) offers the highest mechanical protection. Question 13. The function of a lockout/tagout system is to: A) Secure electrical materials B) Prevent accidental energization of equipment C) Increase system voltage D) Reduce current flow Answer: B Explanation: Lockout/tagout prevents accidental startup or energization during maintenance. Question 14. What is the primary use of a panelboard?
A) Transmit electrical energy B) Provide overcurrent protection and circuit distribution C) Generate electricity D) Store electrical energy Answer: B Explanation: Panelboards distribute power and house circuit protection devices. Question 15. What is the maximum allowable voltage drop for a feeder or branch circuit according to NEC recommendations? A) 1% B) 3% C) 5%
Question 17. Which of the following is NOT a type of raceway? A) EMT B) MC Cable C) RMC D) PVC Answer: B Explanation: MC cable is not a raceway; it is a type of cable assembly. Question 18. What does NEMA stand for regarding enclosures? A) National Electrical Manufacturing Association B) National Energy Maintenance Act
C) North Eastern Maintenance Association D) National Engineering Materials Agency Answer: A Explanation: NEMA is the National Electrical Manufacturing Association, setting enclosure standards. Question 19. What color is typically used for ground conductors in the United States? A) Red B) White C) Black D) Green Answer: D
Question 21. Which of the following is required for all 125V, single- phase, 15- and 20-ampere receptacles in dwelling unit kitchens? A) Arc-fault protection B) GFCI protection C) Surge protection D) Isolated ground Answer: B Explanation: GFCI protection is required in kitchens to reduce shock hazards. Question 22. What is the purpose of a junction box? A) Increase voltage B) Connect and protect spliced conductors
C) Generate current D) Reduce resistance Answer: B Explanation: Junction boxes are used to splice and protect electrical wires. Question 23. Which NEC Article covers grounding and bonding? A) Article 110 B) Article 210 C) Article 250 D) Article 300 Answer: C
A) Manufacturer’s name B) Installer’s name C) Local utility D) Date of installation Answer: A Explanation: Enclosures must be marked with the manufacturer’s name. Question 26. Which is the correct formula for calculating apparent power in an AC circuit? A) S = VI B) S = I^2R C) S = V/I
Answer: A Explanation: Apparent power S in volt-amperes (VA) is voltage times current. Question 27. Which type of test instrument is used to measure continuity in a circuit? A) Voltmeter B) Ammeter C) Ohmmeter D) Power meter Answer: C Explanation: Ohmmeters check continuity by measuring resistance.
