Electrical Wiring Quiz Questions And Answers

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Electrical Wiring Quiz Questions And Answers - Quiz

Take up this hard and challenging electrical wiring quiz questions and answers test and check your knowledge regarding the same. Electrical wiring is an electrical installation of cables in a perfect manner through the wire and its associated devices inside a room or a building. The test contains really hard questions related to the wiring and cables, and it becomes tougher after each step. Do you still think you can give this quiz a try? All the best then.


Questions and Answers
  • 1. 

    The owner hired an electrician to prepare and install the electrical wiring for his house. The electrician with the owner's consent, decided to use a larger size of wiring for the circuit breaker to anticipate overload. After some time, the house was on fire. After the investigation, it was proven that the cause of the fire was faulty wiring. Why did the circuit breaker fail to detect the short circuit/ overloading?

    • A.

      The circuit breaker is defective

    • B.

      The capacity of the wire is too large

    • C.

      The circuit breaker was too far away from where the short circuit happened

    • D.

      All of the above

    Correct Answer
    B. The capacity of the wire is too large
    Explanation
    The circuit breaker failed to detect the short circuit/overloading because the capacity of the wire used was too large. When the electrician decided to use a larger size of wiring, it increased the capacity of the wire beyond what the circuit breaker was designed to handle. As a result, the circuit breaker was unable to detect the excessive current flowing through the wire, leading to overheating and ultimately causing the faulty wiring to catch fire.

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  • 2. 

    The owner hired an electrician to prepare and install the electrical wiring for his house. With the owner's consent, the electrician decided to use a larger size of wiring for the circuit breaker to anticipate overload. After some time, the house was on fire. After the investigation, it was proven that the cause of the fire was faulty wiring. Why did the circuit breaker fail to detect the short circuit/ overloading? Who should be blamed for the fire incident?

    • A.

      The electrician, he used a larger capacity for the wiring

    • B.

      The owner, he did not hire a professional electrician

    • C.

      None, some people are just unfortunate

    • D.

      None, short circuits happen all the time

    Correct Answer
    A. The electrician, he used a larger capacity for the wiring
    Explanation
    The blame for the fire incident could reasonably be attributed to:
    the electrician, he used a larger capacity for the wiring.
    While it's important to hire a professional electrician, in this scenario, the electrician's decision to use a larger wiring capacity without ensuring it was compatible and safe likely contributed to the faulty wiring and, ultimately, the fire.

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  • 3. 

    The owner hired an electrician to prepare and install the electrical wiring for his house. With the owner's consent, the electrician decided to use a larger size of wiring for the circuit breaker to anticipate overload. After some time, the house was on fire. After the investigation, it was proven that the cause of the fire was faulty wiring. Why did the circuit breaker fail to detect the short circuit/ overloading? What should be done by the electrician?

    • A.

      Use the appropriate wiring capacity

    • B.

      None, his plans and actions were appropriate

    • C.

      Take a professional exam

    • D.

      None of the above

    Correct Answer
    A. Use the appropriate wiring capacity
    Explanation
    The circuit breaker failed to detect the short circuit or overloading likely because the electrician used a larger size of wiring than what was appropriate for the circuit breaker. This means that the circuit breaker was not properly matched with the wiring it was supposed to protect. Circuit breakers are designed to trip or disconnect the circuit when there is an overload or a short circuit, but they rely on the correct sizing of wiring to function effectively.
    What the electrician should have done is use the appropriate wiring capacity that matches the circuit breaker's rating. This ensures that the circuit breaker can effectively detect and respond to overloads or short circuits. Using a larger size of wiring without adjusting the circuit breaker accordingly can lead to situations where the circuit breaker fails to provide the necessary protection, as seems to have happened in this case.
    So, the correct answer is: Use the appropriate wiring capacity.

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  • 4. 

    Why is it necessary to plan the data connection cables?

    • A.

      Data cables are expensive

    • B.

      To optimize data transfer speed

    • C.

      To avoid visual chaos

    • D.

      To avoid fire accidents

    Correct Answer
    B. To optimize data transfer speed
    Explanation
    Planning the data connection cables is necessary to optimize data transfer speed. This is because proper planning ensures that the cables are installed in the most efficient and effective way, minimizing any potential interference or signal loss. By carefully planning the layout and routing of the cables, potential bottlenecks or congestion points can be avoided, allowing for faster and more reliable data transfer. This ultimately improves the overall performance and productivity of the network.

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  • 5. 

    What is the best location for telephone lines?

    • A.

      Under the sidewalk on short roads and under the road on wider road

    • B.

      Near the curb

    • C.

      At the center of the road

    • D.

      None

    Correct Answer
    B. Near the curb
    Explanation
    The best location for telephone lines is near the curb. Placing the lines near the curb allows for easier access and maintenance. It also minimizes the disruption caused during repairs or installations. Additionally, locating the lines near the curb reduces the risk of damage from vehicles or construction activities that may occur on the road. This location ensures that the lines are easily accessible for both technicians and residents, making it the most practical and efficient option.

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  • 6. 

    When choosing an office in a high-rise building, what should you consider?

    • A.

      Location of power points and raceways

    • B.

      Height of ceiling

    • C.

      Thickness of partition walls

    • D.

      Number of lighting if enough to the number of workstations

    Correct Answer
    A. Location of power points and raceways
    Explanation
    When choosing an office in a high rise building, it is important to consider the location of power points and raceways. This is because the availability and accessibility of power points and raceways can greatly impact the efficiency and convenience of setting up electrical equipment and managing cables in the office space. It is crucial to have power points and raceways positioned strategically to ensure that all electrical needs are met and that the office layout can accommodate the necessary wiring and connectivity requirements.

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  • 7. 

    What system was used to immediately restore electricity after a sudden disruption, with standby generators coming into operation?

    • A.

      Double throw switch

    • B.

      ATS

    • C.

      Manual transfer switch

    • D.

      UPS

    Correct Answer
    B. ATS
    Explanation
    The Automatic Transfer Switch (ATS) is a critical component of backup power systems. When a sudden disruption occurs, such as a power outage, the ATS detects the loss of utility power and automatically switches the electrical load to the standby generators. This seamless transition ensures uninterrupted power supply to essential equipment and systems, maintaining operational continuity.

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  • 8. 

    Copper pipes are classified as?

    • A.

      Flexible

    • B.

      Rigid

    • C.

      Rigid and flexible

    • D.

      None

    Correct Answer
    B. Rigid
    Explanation
    Copper pipes are classified as rigid because they are not easily bendable or flexible. Rigid pipes maintain their shape and do not easily change direction. Copper pipes are commonly used for plumbing and heating systems due to their durability and ability to withstand high pressure.

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  • 9. 

    This equipment uses a stream of compressed air directed downwards to form a shield to exclude drafts?

    • A.

      Air exhaust

    • B.

      Air sweeper

    • C.

      Air curtain

    • D.

      ACU

    Correct Answer
    C. Air curtain
    Explanation
    An air curtain is a type of equipment that uses a stream of compressed air directed downwards to form a shield. This shield helps to exclude drafts, preventing the movement of air between two different environments. The purpose of an air curtain is to maintain a separation between two spaces while allowing easy access for people and objects. It is commonly used in places like entrances of buildings, warehouses, and industrial facilities to prevent the entry of outside air and maintain a comfortable indoor environment.

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  • 10. 

    What is the ampacity of a 6W multipoint heater at standard voltage of 120V?

    • A.

      20 A

    • B.

      50 mA

    • C.

      40 mA

    • D.

      60 A

    Correct Answer
    B. 50 mA
    Explanation
    The ampacity of a heater, such as a 6W (watt) multipoint heater, can be calculated using the formula:
    Ampacity (A) = Power (W) / Voltage (V)
    Ampacity (A) = 6W / 120V = 0.05 A
    So, the ampacity of a 6W multipoint heater operating at 120V is 0.05 amperes (A), which is equivalent to 50 milliamperes (mA). 

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  • 11. 

    What is the minimum size of wire to be used for service drop?

    • A.

      14mm squared

    • B.

      12mm squared

    • C.

      5.5 mm squared

    • D.

      3.5mm squared

    Correct Answer
    C. 5.5 mm squared
    Explanation
    The minimum size of wire to be used for a service drop is 5.5 mm squared. This size is determined by various factors such as the distance the wire needs to span, the amount of current it needs to carry, and the voltage drop allowed. A larger wire size would be needed for longer distances or higher currents to ensure efficient power transmission and minimize voltage drop. Conversely, a smaller wire size may not be able to handle the required current and could result in overheating or other safety hazards.

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  • 12. 

    What do you call the recessed portion of a wall intended for pipes?

    • A.

      Chase

    • B.

      Duct

    • C.

      Sleeve

    • D.

      Box-up

    Correct Answer
    A. Chase
    Explanation
    A chase is the correct answer because it refers to a recessed portion of a wall that is specifically designed to accommodate pipes. It is a common term used in construction and architecture to describe this feature. The other options, such as duct, sleeve, and box-up, do not accurately describe this particular architectural element.

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  • 13. 

    In power distribution, a group of electric conductors which originate at a main distribution center and supply one or more secondary distributions, one or more branch circuit distribution centers, or a combination of these?

    • A.

      Panel board

    • B.

      Feeder

    • C.

      Service

    • D.

      Raceway

    Correct Answer
    B. Feeder
    Explanation
    A feeder is a group of electric conductors that originate at a main distribution center and supply one or more secondary distributions, one or more branch circuit distribution centers, or a combination of these. It is responsible for transmitting electrical power from the main distribution center to various distribution points.

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  • 14. 

    Another term for underground wiring?

    • A.

      UF

    • B.

      Sub-feeder

    • C.

      WP service feeder

    • D.

      Horizontal feeder

    Correct Answer
    A. UF
    Explanation
    UF stands for Underground Feeder, which is a type of electrical cable that is specifically designed for underground installation. It is commonly used for outdoor lighting, pumps, and other outdoor electrical applications. Therefore, UF is the correct answer as it directly refers to underground wiring. The other options, sub-feeder, WP service feeder, and horizontal feeder, do not specifically indicate underground wiring.

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  • 15. 

    It resists the flow of electricity.

    • A.

      Insulator

    • B.

      Conductor

    • C.

      Semiconductor

    • D.

      Resonator

    Correct Answer
    A. Insulator
    Explanation
    An insulator is a material that resists the flow of electricity. Unlike conductors, which allow electricity to flow easily, insulators have high electrical resistance. This means that they do not allow the free movement of electrons, making it difficult for electricity to pass through them. Examples of insulators include rubber, plastic, and glass.

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  • 16. 

    Ability of conductor without overheating?

    • A.

      Resistance

    • B.

      Capacity

    • C.

      Ampacity

    • D.

      Resilient

    Correct Answer
    C. Ampacity
    Explanation
    The term "ampacity" refers to the maximum amount of electric current that a conductor can carry without overheating. It is a measure of the conductor's ability to handle the flow of electricity without causing damage or creating safety hazards. Ampacity is determined by various factors such as the conductor's material, size, and insulation. Therefore, the correct answer, ampacity, accurately describes the conductor's ability to carry current without overheating.

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  • 17. 

    Which is not true about electrodes?

    • A.

      An electrical conductor used to make contact with a nonmetallic part of a circuit

    • B.

      A conductor through which electricity enters or leaves an object, substance, or region.

    • C.

      Is a metal strip which is used in a conducting solution or substance to pass electricity through it and conduct electricity

    • D.

      None of the above

    Correct Answer
    D. None of the above
    Explanation
    All the statements provided about electrodes are true:
    An electrical conductor used to make contact with a nonmetallic part of a circuit: This is a correct description of an electrode, as it often serves to interface with nonmetallic parts of circuits, especially in electrochemical cells, where the electrode makes contact with an ionic solution.
    A conductor through which electricity enters or leaves an object, substance, or region: This statement is accurate and describes the basic function of an electrode. Electrodes are crucial in any electrical circuit involving electrolytes or other conductive media, as they facilitate the entry or exit of electrical current.
    Is a metal strip which is used in a conducting solution or substance to pass electricity through it and conduct electricity: While electrodes can be made of various materials, metal strips are common types used especially in solutions for processes like electrolysis, making this statement true.

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  • 18. 

    A machine used to convert mechanical energy to electrical energy?

    • A.

      Rectifier

    • B.

      Generator

    • C.

      Alternator

    • D.

      None

    Correct Answer
    B. Generator
    Explanation
    A generator is a machine that converts mechanical energy into electrical energy. It works on the principle of electromagnetic induction, where a magnet is rotated within a coil of wire, creating a changing magnetic field. This changing magnetic field induces an electric current in the wire, producing electrical energy. Therefore, a generator is the correct answer for a machine that converts mechanical energy to electrical energy.

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  • 19. 

    If you are relocating a large office space using numerous cables, aside from the size of the new location, what should be considered?

    • A.

      Raised flooring

    • B.

      Height of the ceiling

    • C.

      Availability of power points

    • D.

      All of the above

    Correct Answer
    D. All of the above
    Explanation
    When relocating a large office space using numerous cables, several factors should be considered. The size of the new location is important to ensure that there is enough space to accommodate the cables. The height of the ceiling is also crucial as it determines the length of the cables needed and the accessibility for installation. Additionally, the availability of power points is essential to ensure that all devices and equipment can be properly connected. Therefore, all of the above factors should be considered when relocating a large office space with numerous cables.

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  • 20. 

    Which is the most rigid?

    • A.

      EMT

    • B.

      RSC

    • C.

      IMT

    • D.

      RXW

    Correct Answer
    B. RSC
    Explanation
    RSC is the most rigid option among EMT, RSC, IMT, and RXW. Rigidness refers to the ability of a material or structure to resist deformation under stress. RSC (presumably referring to Reinforced Steel Concrete) is known for its high strength and stiffness, making it a commonly used material in construction and engineering projects. EMT (Electrical Metallic Tubing), IMT (Intermediate Metal Conduit), and RXW (which is not defined in the question) are not typically known for their rigidity compared to RSC.

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  • 21. 

    When preparing electrical plans for submission, the plans must be duly signed by?

    • A.

      Master electrician

    • B.

      Electrical engineer

    • C.

      Electronics

    • D.

      Electrician

    Correct Answer
    B. Electrical engineer
    Explanation
    When preparing electrical plans for submission, they must be signed by an electrical engineer. This is because an electrical engineer is a qualified professional who has the knowledge and expertise to ensure that the plans comply with all the necessary electrical codes and regulations. Their signature on the plans indicates that they have reviewed and approved the design, ensuring that it meets the required standards for safety and functionality.

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  • 22. 

    It is the Philippine Electrical Code.

    • A.

      RA 184

    • B.

      RA 7920

    • C.

      RA 1378

    • D.

      RA 544

    Correct Answer
    B. RA 7920
  • 23. 

    BLDG. PERMIT APPLICATION: For new electrical installation, (with more than twenty outlets or a capacity of more than a 4Kw, of any voltage,) application shall be accompanied by a technical specifications and electrical plans signed and sealed by a duly license?

    • A.

      Electrical Engineer

    • B.

      Professional Electrical Engineer

    • C.

      Electrician

    • D.

      None

    Correct Answer
    B. Professional Electrical Engineer
    Explanation
    The correct answer is Professional Electrical Engineer. This is because the question is asking for the appropriate person to sign and seal the technical specifications and electrical plans for a new electrical installation. A Professional Electrical Engineer is qualified and licensed to perform this task, ensuring that the installation meets the necessary standards and regulations.

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  • 24. 

    Which of the following appliances requires an individual appliance circuit?

    • A.

      Water heater

    • B.

      Range

    • C.

      Washer & dryer

    • D.

      All of the above

    Correct Answer
    D. All of the above
    Explanation
    All of the appliances mentioned in the options (water heater, range, washer & dryer) require an individual appliance circuit. An individual appliance circuit is necessary because these appliances have high power requirements and draw a significant amount of electricity. Providing them with their own dedicated circuit ensures that they have enough power supply and prevents overloading of the electrical system.

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  • 25. 

    Does a slotted device that receives the prongs of plugs offer a safe means of connecting portable electrical units to the circuit?

    • A.

      Convenience Receptacle Outlet

    • B.

      Utility Box

    • C.

      Junction Box

    • D.

      Switch

    Correct Answer
    A. Convenience Receptacle Outlet
    Explanation
    A convenience receptacle outlet is a slotted device that receives the prongs of plugs, providing a safe and convenient way to connect portable electrical units into the circuit. This type of outlet is commonly found in homes and buildings, allowing easy access to electrical power for various devices and appliances. It is designed to ensure a secure connection and minimize the risk of electrical hazards.

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  • 26. 

    In the figure above identify the weatherproof box?

    • A.

      A

    • B.

      B

    • C.

      F

    • D.

      E

    • E.

      C

    Correct Answer
    C. F
  • 27. 

      In the figure above, identify the flush-floor box.

    • A.

      A

    • B.

      B

    • C.

      C

    • D.

      D

    Correct Answer
    C. C
  • 28. 

    In the figure above, identify the utility box.

    • A.

      A

    • B.

      B

    • C.

      C

    • D.

      D

    Correct Answer
    D. D
  • 29. 

    An area or space provided at load centers where panel boards, breakers, switch gears, and other electrical equipment are installed?

    • A.

      Mechanical Room

    • B.

      Electrical Room

    • C.

      Service Equipment Room

    • D.

      Server Room

    Correct Answer
    B. Electrical Room
    Explanation
    An electrical room is a designated area where various electrical equipment such as panel boards, breakers, switch gears, and other electrical devices are installed. It is specifically designed to house and protect these electrical components, ensuring their proper functioning and accessibility for maintenance and repairs. The electrical room is typically located at load centers to efficiently distribute power throughout a building or facility.

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  • 30. 

    Are used where it is desired to control lamps from TWO different points, as in a stairwell?

    • A.

      Four-Way Switches (S4W)

    • B.

      Three-Way Switches (S3W)

    • C.

      Two Gang Switch (S2W)

    • D.

      One-Way Switch (S1W)

    Correct Answer
    B. Three-Way Switches (S3W)
    Explanation
    Three-way switches are used where it is desired to control lamps from two different points, such as in a stairwell. These switches allow for the control of a single light fixture from two different locations. They have three terminals, allowing for two different switch positions that can be used to turn the light on or off. By using three-way switches, it is possible to control the same light fixture from either end of a hallway or staircase.

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  • 31. 

    Individual conductors used for circuit wiring up to No. 8 AWG?

    • A.

      Wire

    • B.

      Cable

    • C.

      Bus Bars

    • D.

      Conduits

    Correct Answer
    A. Wire
    Explanation
    Individual conductors used for circuit wiring up to No. 8 AWG are typically referred to as wires. Wires are solid or stranded metal conductors that are used to transmit electrical signals or power within a circuit. They are commonly used in residential and commercial buildings for various electrical applications, such as lighting, outlets, and appliances. Wires are available in different sizes, with No. 8 AWG being a commonly used size for smaller circuits.

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  • 32. 

    Are circular raceways used to enclose wires and cables and are of metal or plastic (PVC).

    • A.

      Outlet

    • B.

      Cable

    • C.

      Bus Bars

    • D.

      Conduits

    Correct Answer
    D. Conduits
    Explanation
    Conduits are used to enclose wires and cables, and they can be made of either metal or plastic (PVC). Circular raceways refer to the shape of the conduits, which are cylindrical in nature. Outlets are points where electrical devices can be connected, cables are the insulated wires used for transmitting electricity, and bus bars are conductive metal bars used for distributing electricity.

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  • 33. 

    Heat-resistant thermoplastic used in dry Locations?

    • A.

      THN

    • B.

      THWN

    • C.

      THHN

    • D.

      THW

    Correct Answer
    C. THHN
    Explanation
    THHN is the correct answer because it stands for Thermoplastic High Heat-resistant Nylon-coated. It is a type of heat-resistant thermoplastic that is commonly used in dry locations. The nylon coating provides additional protection and durability, making it suitable for applications where high temperatures may be present. THN, THWN, and THW are not specifically designed to be heat-resistant, so they are not the correct choices for this question.

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  • 34. 

    GFCI is an overcurrent protective device that will provide ground fault protection as well as function as an ordinary circuit breaker. What does GFCI stand for?

    • A.

      GRID FAULT CIRCUIT INTERRUPTER

    • B.

      GROUND FAULT CIRCUIT INTERRUPTER

    • C.

      GROUND FAULT CABLE INTERRUPTER

    • D.

      GRID FAULT CONDUIT INTERRUPTER

    Correct Answer
    B. GROUND FAULT CIRCUIT INTERRUPTER
    Explanation
    The correct answer is "GROUND FAULT CIRCUIT INTERRUPTER." GFCI stands for Ground Fault Circuit Interrupter, which is an overcurrent protective device that provides ground fault protection and functions as a circuit breaker. It is designed to quickly shut off power to a circuit when it detects a ground fault, preventing electrical shocks and reducing the risk of electrical fires.

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  • 35. 

    _______ are OVER-CURRENT CIRCUIT PROTECTIVE DEVICES, its sole purpose is to protect insulation, wiring, switches and other apparatus from overheating or burning, due to overloads, to faults or to short circuits, by automatically cutting off the circuit.

    • A.

      Fuse & Circuit breaker

    • B.

      Switch Boards & Unit Substations

    • C.

      GFCI & Panel Boards

    • D.

      All of the above

    Correct Answer
    A. Fuse & Circuit breaker
    Explanation
    Fuses and circuit breakers are over-current circuit protective devices designed to safeguard electrical systems by interrupting the circuit in the event of overloads, faults, or short circuits. Their primary purpose is to prevent overheating or burning of insulation, wiring, switches, and other components by automatically disconnecting the circuit. The other options mentioned (Switch Boards & Unit Substations, GFCI & Panel Boards) are not specific to over-current protection but may be components of electrical systems.

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  • 36. 

    Recommended light bulb used for residential dwellings, known for its efficient and power saving properties?

    • A.

      Mercury Lamp

    • B.

      Incandescent

    • C.

      HID lamp

    • D.

      CFL

    Correct Answer
    D. CFL
    Explanation
    CFL stands for Compact Fluorescent Lamp, which is a recommended light bulb used for residential dwellings. It is known for its efficient and power-saving properties. CFLs use less energy compared to traditional incandescent bulbs, making them more environmentally friendly and cost-effective. They also have a longer lifespan, reducing the need for frequent replacements. Therefore, CFL is the correct answer for the question.

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  • 37. 

    Service drop conductors, when crossing a street, shall have a clearance of not less than ____ meters from the crown of the street or sidewalk over which it passes, and shall have a minimum clearance of 3.00 meters above ground at its point of attachment to the building pedestal.

    • A.

      5.00 mts

    • B.

      5.10 mts

    • C.

      5.30 mts

    • D.

      5.50 mts

    Correct Answer
    D. 5.50 mts
    Explanation
    Service drop conductors must have a clearance of not less than 5.50 meters from the crown of the street or sidewalk when crossing a street. Additionally, they should have a minimum clearance of 3.00 meters above ground at their point of attachment to the building pedestal. This ensures the safety and proper functioning of the service drop conductors, preventing any potential hazards or interference with other structures or pedestrians.

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  • 38. 

    Electricity was suddenly disrupted by a lightning strike, after 5-10 seconds the power was automatically restored by an emergency device. What was used?

    • A.

      Safety Switch

    • B.

      Automatic Transfer switch

    • C.

      Double Throw switch

    • D.

      UPS Switch

    Correct Answer
    B. Automatic Transfer switch
    Explanation
    An Automatic Transfer switch is used in situations where there is a sudden disruption in power supply, such as a lightning strike. It automatically detects the loss of power and switches the load to an alternate power source, such as a backup generator. This ensures that the power is restored within a few seconds without any manual intervention. Therefore, in this scenario, an Automatic Transfer switch would have been used to restore the power after the lightning strike.

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  • 39. 

    Identify the Electrical symbol of a Fuse?

    • A.

      A

    • B.

      B

    • C.

      C

    • D.

      D

    • E.

      E

    Correct Answer
    B. B
    Explanation
    The electrical symbol for a fuse is represented by a rectangle with a diagonal line across it. This symbol is commonly used in circuit diagrams to indicate the presence of a fuse, which is a protective device that breaks the circuit in the event of excessive current flow. By using this symbol, engineers and electricians can easily identify where fuses are located in a circuit and ensure proper protection against overloads.

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  • 40. 

    Identify the Electrical symbol of a Switch?

    • A.

      A

    • B.

      B

    • C.

      C

    • D.

      D

    • E.

      E

    Correct Answer
    C. C
    Explanation
    The correct answer is C. The symbol C represents a switch in electrical circuits. A switch is a device that can open or close a circuit, allowing or interrupting the flow of electricity. The symbol typically consists of a line with a gap in the middle, indicating that the circuit can be completed or broken by the switch.

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  • 41. 

    Identify the Electrical symbol of a Circuit Breaker?

    • A.

      A

    • B.

      B

    • C.

      C

    • D.

      D

    • E.

      E

    Correct Answer
    A. A
    Explanation
    The electrical symbol for a circuit breaker is represented by option A.

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  • 42. 

    Current which always flows in the same direction?

    • A.

      Direct Circuit

    • B.

      Static Electricity

    • C.

      Alternating Current

    • D.

      Direct Current

    Correct Answer
    D. Direct Current
    Explanation
    Direct current (DC) is the correct answer because it refers to the flow of electric charge in only one direction. Unlike alternating current (AC), which periodically changes direction, DC maintains a constant flow in a circuit. This is commonly found in batteries, where electrons flow from the negative terminal to the positive terminal in a continuous manner.

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  • 43. 

    The name given to the practical unit of rate of flow of electricity?

    • A.

      Ohm

    • B.

      Volt

    • C.

      Ampere

    • D.

      Resistance

    Correct Answer
    C. Ampere
    Explanation
    The practical unit of rate of flow of electricity is called Ampere. Ampere is a measure of electric current, representing the amount of charge passing through a point in a circuit per unit of time. It is named after the French physicist André-Marie Ampère, who made significant contributions to the field of electromagnetism. Ampere is widely used in electrical engineering and is an essential concept in understanding and analyzing electrical circuits.

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  • 44. 

    Unit of EMF (Electromotive force). It is the unit whereby the tendency to establish and maintain electric currents may be measured.

    • A.

      Ohm

    • B.

      Volt

    • C.

      Ampere

    • D.

      Resistance

    Correct Answer
    B. Volt
    Explanation
    The correct answer is Volt. Volt is the unit of electromotive force (EMF), which is the driving force that pushes electric charges through a circuit. It represents the potential difference between two points in a circuit, indicating the amount of energy required to move a unit of charge between those points. Therefore, it is the unit used to measure the tendency to establish and maintain electric currents.

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  • 45. 

    Is the time rate of doing work. The faster work is done, the greater the _____ that will be required to do it.

    • A.

      Conductivity

    • B.

      Work

    • C.

      Energy

    • D.

      Power

    Correct Answer
    D. Power
    Explanation
    Power is the correct answer because it is defined as the time rate of doing work. In other words, power measures how quickly work is done. When work is done at a faster rate, more power is required to accomplish it. Therefore, the greater the power, the faster work can be done.

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  • 46. 

    Is the rate of doing electrical work. The unit is the watt or the kilowatt.

    • A.

      Horsepower

    • B.

      Work

    • C.

      Energy

    • D.

      Electric Power

    Correct Answer
    D. Electric Power
    Explanation
    Electric power refers to the rate at which electrical work is done. It is measured in watts or kilowatts. This means that electric power indicates how quickly energy is being transferred or converted in an electrical system. It is a crucial concept in understanding and analyzing electrical circuits and devices.

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  • 47. 

    Is a device for making, breaking, or changing connections in an electric circuit under the conditions of load for which it is rated. It is not designed for interruption of a circuit under short-circuit conditions?

    • A.

      Generator

    • B.

      Switch

    • C.

      Fuse

    • D.

      Transformer

    Correct Answer
    B. Switch
    Explanation
    A switch is a device that is used to make, break, or change connections in an electric circuit. It is designed to handle the conditions of load for which it is rated, meaning it can handle the normal operating load of the circuit. However, it is not designed to interrupt the circuit under short-circuit conditions, which require a different type of protection device like a fuse. Therefore, the correct answer is switch.

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  • 48. 

    A large single panel, frame, or assembly of panels on which are mounted, on the face or back or both, switches, over current and other protective devices, buses. This panel is generally accessible from the rear as well as from the front and are not intended to be installed in cabinets?

    • A.

      Panelboard

    • B.

      Switchboards

    • C.

      Panelbox

    • D.

      Substations

    Correct Answer
    B. Switchboards
    Explanation
    A switchboard is a large panel or assembly of panels that contains switches, protective devices, and buses. It is designed to be accessible from both the front and the rear and is not meant to be installed in cabinets. Switchboards are used to control and distribute electrical power in various applications, such as industrial settings or large buildings.

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  • 49. 

    A single panel or a group of panel units designed for assembly in the form of a single panel, including buses and with or without switches and/or automatic over current protective devices for the control of light, heat or power circuits, designed to be placed in a cabinet or cutout box placed in or against a wall or partition and accessible only from the front.

    • A.

      Panelboard

    • B.

      Switchboards

    • C.

      Outletbox

    • D.

      Substations

    Correct Answer
    A. Panelboard
    Explanation
    A panelboard is a unit or group of panel units that are designed to be assembled as a single panel. It includes buses and may or may not have switches and/or automatic overcurrent protective devices. The purpose of a panelboard is to control light, heat, or power circuits. It is designed to be placed in a cabinet or cutout box, which is then placed in or against a wall or partition. The panelboard is only accessible from the front.

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  • 50. 

    Identify the 30 DEG ELBOW?

    • A.

      A

    • B.

      B

    • C.

      C

    Correct Answer
    C. C
Matt Balanda |BS, Science |
Physics Expert
Matt graduated with a Master's in Educational Leadership for Faith-Based Schools from California Baptist University and a Bachelor's of Science in Aerospace Engineering and Mathematics from the University of Arizona. A devoted leader, transitioned from Aerospace Engineering to inspire students. As the High School Vice-Principal and a skilled Physics teacher at Calvary Chapel Christian School, his passion is nurturing a love for learning and deepening students' connection with God, fostering a transformative educational journey.

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  • Current Version
  • Apr 17, 2024
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    Expert Reviewed by
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