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Question 1. Which law relates voltage, current, and resistance in an electrical circuit? A) Faraday's Law B) Ohm's Law C) Coulomb's Law D) Kirchhoff's Voltage Law Answer: B Explanation: Ohm's Law states that voltage (V) equals current (I) multiplied by resistance (R), or V = IR, forming the fundamental relationship between these quantities in electrical circuits. Question 2. What is the primary unit of power used in electrical systems? A) Volt B) Watt C) Ampere D) Ohm Answer: B Explanation: The watt (W) is the SI unit of power, representing the rate of energy transfer or consumption in electrical systems.
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Question 3. Which circuit configuration involves components connected end- to-end so that the same current flows through each? A) Parallel circuit B) Series circuit C) Complex circuit D) Mixed circuit Answer: B Explanation: In a series circuit, components are connected end-to-end, so the current is the same through all components, but the voltage divides among them. Question 4. In AC circuits, what does a capacitor primarily oppose? A) Changes in voltage B) Steady-state current C) Changes in current D) Steady-state voltage Answer: A Explanation: Capacitors oppose changes in voltage by storing and releasing energy in the electric field, thus affecting AC signals and reactive power.
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Question 7. When using a multimeter to measure resistance, which function should be selected? A) Voltage B) Current C) Resistance D) Continuity Answer: C Explanation: To measure resistance, the multimeter should be set to the resistance (Ω) function, which applies a small voltage and measures the resulting current. Question 8. Which testing device is most suitable for measuring high AC currents in a conductor without breaking the circuit? A) Megohmmeter B) Clamp meter C) Multimeter D) Insulation resistance tester Answer: B Explanation: A clamp meter measures high AC currents by clamping around a conductor without the need to disconnect or break the circuit.
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Question 9. Which is a primary cause of electrical shock hazards? A) Proper grounding B) Arc flash C) Faulty insulation D) Use of PPE Answer: C Explanation: Faulty insulation can expose live parts, increasing the risk of electrical shock to personnel. Question 10. Which type of PPE is essential when working on energized electrical equipment? A) Safety goggles B) Insulated gloves C) Steel-toed boots D) Ear protection Answer: B Explanation: Insulated gloves provide protection against electrical shocks when working on energized equipment.
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Question 13. According to the NEC, what minimum working clearance is generally required in front of electrical equipment operating at over 600V? A) 3 feet B) 4 feet C) 10 feet D) 12 feet Answer: C Explanation: The NEC typically requires a minimum working clearance of 10 feet in front of equipment operating above 600V to ensure safety during maintenance. Question 14. What is the purpose of an overcurrent protection device in an electrical circuit? A) To limit voltage B) To prevent overloads and short circuits C) To regulate current flow D) To reduce power consumption Answer: B
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Explanation: Overcurrent protection devices, such as fuses and circuit breakers, prevent excessive current that could cause damage or fire. Question 15. Which conductor material has higher conductivity? A) Copper B) Aluminum C) Steel D) Brass Answer: A Explanation: Copper has higher electrical conductivity compared to aluminum and other materials, making it a common choice for conductors. Question 16. What type of conduit is most flexible and often used for temporary wiring or bends? A) EMT B) RMC C) Flexible conduit D) PVC conduit Answer: C
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D) Fuse Answer: B Explanation: GFCIs (Ground-Fault Circuit Interrupters) detect ground faults and shut off power to prevent shock, especially useful in wet or damp locations. Question 19. Which type of switch is designed to automatically open or close a circuit based on a predetermined condition? A) Toggle switch B) Thermostat switch C) Dimmer switch D) Momentary switch Answer: B Explanation: A thermostat switch automatically controls circuit operation based on temperature, often used for HVAC systems. Question 20. What is the primary function of a transformer in electrical systems? A) Convert AC to DC B) Change voltage levels C) Store electrical energy
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D) Protect against overloads Answer: B Explanation: Transformers change voltage levels—either stepping up or stepping down voltage—by electromagnetic induction, without changing the frequency. Question 21. Which of the following best describes the purpose of a GFCI? A) Protects against overloads B) Detects ground faults and interrupts the circuit C) Isolates circuit sections for maintenance D) Protects against arc faults Answer: B Explanation: GFCIs detect ground faults by monitoring current imbalance and quickly disconnect power to prevent shock hazards. Question 22. Which is an example of a resistive load? A) Electric heater B) Fluorescent lamp C) Inductive motor
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D) Transformer Answer: B Explanation: A disconnecting means is a switch or device that allows the circuit to be safely de-energized for maintenance or emergencies. Question 25. What is the main purpose of bonding in electrical systems? A) To prevent overcurrent B) To establish a low-impedance path to ground C) To increase voltage capacity D) To insulate conductors Answer: B Explanation: Bonding ensures a low-impedance path to ground, reducing the risk of electrical shock and ensuring proper operation of protective devices. Question 26. Which type of grounding electrode system is most common for residential installations? A) Metal water pipe B) Driven ground rod C) Concrete-encased electrode
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D) All of the above Answer: D Explanation: Residential systems typically utilize multiple grounding electrodes such as water pipes, ground rods, and concrete-encased electrodes to establish a reliable ground. Question 27. Where should GFCIs be installed for maximum safety in a typical home? A) In the main panel only B) In bathrooms, kitchens, and outdoor receptacles C) In bedrooms only D) In garage circuits only Answer: B Explanation: GFCIs are required in locations where the risk of electrical shock is higher, such as bathrooms, kitchens, outdoor receptacles, and garages. Question 28. Which type of conduit is made of rigid metal and provides excellent mechanical protection? A) EMT B) RMC
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B) SJOOW cord C) MC cable D) USE cable Answer: B Explanation: SJOOW cord is a flexible, portable cord suitable for extension cords and portable equipment, designed for flexibility and outdoor use. Question 31. Which type of receptacle is required for outdoor, wet locations? A) Standard receptacle B) GFCI-protected receptacle C) Weather-resistant receptacle D) Both B and C Answer: D Explanation: Outdoor wet locations require weather-resistant receptacles with GFCI protection for safety against moisture and shock hazards. Question 32. Which switch type allows for control of lighting from two locations? A) Single-pole switch
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B) Three-way switch C) Dimmer switch D) Toggle switch Answer: B Explanation: A three-way switch allows control of the same lighting fixture from two different locations. Question 33. Which device provides overcurrent protection specifically at the service entrance? A) Fuse B) Main circuit breaker C) GFCI D) Overload relay Answer: B Explanation: The main circuit breaker at the service entrance provides overcurrent protection for the entire electrical system. Question 34. Which wire size is typically required for a 20-amp branch circuit in residential wiring? A) 14 AWG
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C) Inductive motor D) Resistance heater Answer: C Explanation: Inductive motors are non-resistive loads because they primarily consume reactive power due to their inductance. Question 37. What does the term "ampacity" refer to? A) The maximum current a conductor can carry without exceeding temperature limits B) The voltage a conductor can withstand C) The resistance of a wire at room temperature D) The physical size of a conductor Answer: A Explanation: Ampacity is the maximum current that a conductor can safely carry without exceeding its temperature rating. Question 38. Which NEC article covers wiring methods and materials? A) Article 250 B) Article 300
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C) Article 310 D) Article 400 Answer: C Explanation: Article 310 of the NEC covers conductors, wiring methods, and materials used in electrical installations. Question 39. Which is a typical application for EMT conduit? A) Underground wiring B) Exposed indoor wiring C) Outdoor direct burial D) Flexible connections Answer: B Explanation: EMT (Electrical Metallic Tubing) is commonly used for exposed or concealed indoor wiring where mechanical protection is needed. Question 40. Which is a key consideration when installing conduit bends? A) Bends should be as sharp as possible B) Bends should be smooth and gradual to prevent wire damage C) Bends are not necessary if the conduit is flexible
