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Question 1. According to Ohm's Law, if the voltage across a resistor is 120V and the resistance is 60Ω, what is the current flowing through the resistor? A) 1 A B) 2 A C) 0.5 A D) 60 A Answer: B Explanation: Ohm's Law states I = V / R. Substituting the given values, I = 120V / 60Ω = 2A. Question 2. Which of the following units is used to measure reactive power in AC circuits? A) Watts (W) B) Volt-amperes (VA) C) Volt-amperes reactive (VAR) D) Coulombs (C) Answer: C Explanation: Reactive power is measured in Volt-amperes reactive (VAR), representing the energy stored and released by reactive components like inductors and capacitors. Question 3. In a series circuit, what happens to the total resistance when an additional resistor is added? A) It decreases B) It remains the same C) It increases D) It becomes zero Answer: C Answer: C Explanation: In a series circuit, the total resistance is the sum of individual resistances; adding a resistor increases the total resistance. Question 4. Which characteristic distinguishes AC from DC circuits? A) Continuous unidirectional flow
B) Alternating direction of current flow C) Zero impedance D) Constant voltage Answer: B Explanation: AC circuits have current that alternates direction periodically, whereas DC flows in one direction. Question 5. Which principle explains how a changing magnetic field induces an electric current in a conductor? A) Coulomb's Law B) Faraday's Law of Electromagnetic Induction C) Ohm's Law D) Lenz's Law Answer: B Explanation: Faraday's Law states that a changing magnetic flux through a conductor induces an electromotive force (EMF), producing current. Question 6. What is the primary effect of adding an inductor in an AC circuit? A) Decreases impedance B) Introduces capacitance C) Causes current to lag voltage D) Causes current to lead voltage Answer: C Explanation: An inductor causes the current to lag behind the voltage in AC circuits due to its inductive reactance. Question 7. In a three-phase system, what is the phase difference between each of the three voltages? A) 45 degrees B) 90 degrees C) 120 degrees
C) Alternator D) Battery Answer: C Answer: C Explanation: An alternator is a type of generator that converts mechanical energy into AC electrical energy via electromagnetic induction. Question 11. Which motor type operates based on the interaction of magnetic fields produced by stator and rotor currents? A) Induction motor B) Synchronous motor C) Universal motor D) Brushed DC motor Answer: A Answer: A Explanation: Induction motors operate by electromagnetic induction between stator and rotor currents, creating torque. Question 12. Which power factor correction method involves adding capacitors to offset inductive loads? A) Series correction B) Shunt correction C) Series-parallel correction D) None of the above Answer: B Answer: B Explanation: Shunt capacitor banks are added across the load to improve power factor by compensating for inductive reactance. Question 13. Which harmonic order is typically the most problematic in electrical systems?
A) 3rd harmonic B) 5th harmonic C) 7th harmonic D) 11th harmonic Answer: A Answer: A Explanation: The 3rd harmonic is particularly problematic because it can cause neutral conductor overheating and distortion in the system. Question 14. What is the purpose of a rectifier in electronic circuits? A) To convert AC to DC B) To convert DC to AC C) To store electrical energy D) To amplify signals Answer: A Explanation: Rectifiers are devices that convert alternating current (AC) into direct current (DC). Question 15. Which troubleshooting technique involves isolating sections of a circuit to identify faults? A) Loop testing B) Divide and conquer C) Continuity testing D) Insulation resistance testing Answer: B Explanation: Divide and conquer involves systematically isolating parts of the circuit to locate faults efficiently. Question 16. What is the primary purpose of the NEC? A) To regulate electrical prices B) To ensure safe electrical installations and practices
Answer: B Answer: B Explanation: AFCI (Arc-Fault Circuit Interrupter) devices detect arc faults that could cause fires and disconnect power. Question 20. For underground wiring, which conduit material is most resistant to corrosion? A) Steel B) PVC C) Aluminum D) Copper Answer: B Answer: B Explanation: PVC conduit is highly resistant to corrosion and suitable for underground wiring. Question 21. Which type of luminaire is typically installed on a ceiling for general lighting? A) Floodlight B) Recessed can C) Streetlight D) Sign light Answer: B Answer: B Explanation: Recessed can luminaires are installed in ceilings to provide general illumination. Question 22. When sizing circuits for a dishwasher, which of the following is most important? A) Power rating of the appliance B) Length of wiring run C) Number of outlets nearby D) Type of flooring Answer: A
Explanation: The power rating determines the circuit size needed to safely supply the appliance. Question 23. Which receptacle type is required in outdoor residential settings according to NEC? A) Standard receptacle B) Tamper-resistant and weather-resistant receptacle C) GFCI only D) 240V receptacle Answer: B Answer: B Explanation: NEC requires weather-resistant and tamper-resistant receptacles for outdoor use to ensure safety. Question 24. Which type of heating system is most commonly installed with dedicated circuits? A) Baseboard heaters B) Space heaters C) Electric furnaces D) All of the above Answer: D Answer: D Explanation: All these heating systems typically require dedicated circuits for safety and proper operation. Question 25. Which occupancy classification in the NEC involves locations with combustible dust or flammable vapors? A) Class I B) Class II C) Class III D) Class IV Answer: B Answer: B
Question 29. When selecting overcurrent protection devices, what is a primary consideration? A) The color of the device B) The ampacity of conductors C) The number of outlets D) The length of the circuit Answer: B Answer: B Explanation: Overcurrent protection devices must be rated appropriately based on the conductor's ampacity to prevent overloads. Question 30. Which Maryland regulation is responsible for licensing master electricians? A) Maryland State Board of Electricians B) Maryland Department of Labor C) Maryland Electrical Safety Commission D) Maryland Construction Licensing Board Answer: A Answer: A Explanation: The Maryland State Board of Master Electricians administers licensing, regulation, and discipline for master electricians. Question 31. In Maryland, what is typically required before starting electrical work on a project? A) No permit needed B) Permitting and inspection approval C) Only a verbal approval D) Insurance coverage only Answer: B Answer: B Explanation: Permits and inspections are required in Maryland to ensure electrical work complies with regulations and safety standards.
Question 32. Which contract type involves billing based on actual costs plus a fixed fee for profit? A) Fixed-price contract B) Cost-plus contract C) Time and materials contract D) Lump sum contract Answer: B Answer: B Explanation: Cost-plus contracts reimburse the contractor for actual costs plus an agreed-upon profit margin. Question 33. When estimating materials for a project, what factor must be added to account for waste and splicing? A) 0% B) 5-10% C) 20% D) 50% Answer: B Answer: B Explanation: A 5-10% contingency is typically added to material estimates to account for waste, splicing, and errors. Question 34. In project management, which activity involves establishing the sequence of tasks and their durations? A) Resource allocation B) Scheduling C) Quality control D) Cost estimating Answer: B Answer: B
Explanation: Lockout/tagout procedures ensure equipment is de-energized and cannot be started accidentally during servicing. Question 38. Which PPE is most critical when working near energized electrical parts? A) Safety glasses B) Insulated gloves C) Hard hat D) Steel-toed boots Answer: B Answer: B Explanation: Insulated gloves provide protection against electrical shock when working near energized parts. Question 39. What is a key Maryland regulation regarding the discipline of licensed electricians? A) No discipline is enforced B) Disciplinary actions may include license suspension or revocation C) Only fines are applied D) Disciplinary actions are not specified Answer: B Answer: B Explanation: The Maryland State Board of Master Electricians can discipline licensees through suspension or revocation for violations. Question 40. Which type of contract is most suited for projects with well-defined scope and fixed costs? A) Cost-plus B) Fixed-price C) Time and materials D) Cost-plus fixed fee Answer: B Answer: B
Explanation: Fixed-price contracts are ideal when the scope is clear, and the total cost can be predetermined. Question 41. Which of these is necessary when performing a load calculation for a dwelling unit? A) Number of windows B) Number of electrical outlets C) Total connected load including lighting and appliances D) Length of wiring runs Answer: C Answer: C Explanation: Load calculations consider the total connected load, including lighting, receptacles, and appliances, to size the service properly. Question 42. Which NEC article covers requirements for emergency systems? A) Article 700 B) Article 710 C) Article 760 D) Article 800 Answer: A Answer: A Explanation: Article 700 specifies the installation requirements for emergency systems to ensure they operate reliably during emergencies. Question 43. When installing a GFCI receptacle outdoors, what is an important consideration? A) It must be a standard receptacle B) It must be weatherproof and tamper-resistant C) It requires no special features D) It can only be used indoors Answer: B Answer: B
Explanation: The NEC does not specify a minimum number of receptacles; the circuit must be sized to handle the load. Question 47. How does the NEC classify a hazardous (classified) location? A) By use B) By hazard type and area classification C) By geographic location only D) By building age Answer: B Answer: B Explanation: Hazardous locations are classified based on the presence of flammable vapors, dust, or fibers, and their classification depends on the hazard level and area. Question 48. Which electrically operated device is used to automatically control lighting or equipment based on a sensor? A) Relay B) Timer C) Contactors D) Control switch Answer: B Answer: B Explanation: Timers are used to control devices automatically based on preset time settings. Question 49. What is the main consideration when sizing conductors for a motor circuit? A) Number of starts per hour B) Motor horsepower and load characteristics C) Length of the circuit D) Ambient temperature only Answer: B Answer: B
Explanation: Motor conductors are sized based on the motor’s horsepower and current requirements to ensure safe operation. Question 50. Which NEC article addresses energy storage systems such as batteries? A) Article 480 B) Article 706 C) Article 690 D) Article 700 Answer: B Answer: B Explanation: Article 706 covers the installation and safety requirements for energy storage systems, including batteries. Question 51. In Maryland, which document must be obtained before performing new electrical installations? A) Building permit B) Electrical permit C) Zoning approval D) No document is required Answer: B Answer: B Explanation: An electrical permit is required in Maryland before commencing electrical work to ensure compliance with codes and safety standards. Question 52. Which of the following best describes a fixed-price contract? A) Payment based on actual costs plus a fee B) Payment is fixed regardless of actual costs C) Payment based on hourly work D) Payment only after project completion Answer: B
Answer: C Explanation: Corporations offer limited liability, protecting owners' personal assets from business debts. Question 56. Which OSHA regulation pertains to working at heights? A) 29 CFR 1910. B) 29 CFR 1926. C) 29 CFR 1910. D) 29 CFR 1926. Answer: B Answer: B Explanation: OSHA 29 CFR 1926.451 addresses scaffolding and working at heights in construction. Question 57. Lockout/tagout procedures are primarily designed to prevent: A) Theft of tools B) Accidental energization of equipment during maintenance C) Unauthorized access D) Fire hazards Answer: B Explanation: Lockout/tagout procedures ensure equipment cannot be energized accidentally during servicing, protecting workers. Question 58. Which PPE is essential when working on energized conductors? A) Steel-toed boots B) Insulated gloves and face shield C) Ear plugs D) Dust mask Answer: B Answer: B Explanation: Insulated gloves and face shields protect against electrical shock and arc flash hazards.
Question 59. Maryland’s licensing requirements for master electricians include: A) Passing a written exam B) Completing a certain number of supervised hours C) Meeting age and experience criteria D) All of the above Answer: D Answer: D Explanation: Maryland requires passing an exam, experience hours, and meeting age criteria for licensing as a master electrician. Question 60. Which type of contract involves billing based on actual work done plus a fee? A) Fixed-price B) Cost-plus C) Lump sum D) Time and materials Answer: B Answer: B Explanation: Cost-plus contracts reimburse actual costs plus an agreed-upon fee or percentage for profit. Question 61. When performing load calculations for a commercial occupancy, which factor is considered? A) Number of windows B) Lighting load, receptacle load, HVAC demand C) Building height D) Color of interior walls Answer: B Answer: B
