Electrical Installation Quiz

Reviewed by Matt Balanda
Matt Balanda, BS (Aerospace Engineering) |
Science Teacher
Review Board Member
Matt Balanda, a Calvary Chapel Christian School leader with a Bachelor's in Aerospace Engineering and Mathematics, transitioned from Aerospace Engineering to Education with a Master's from California Baptist University. As the High School Vice-Principal and Physics teacher, he nurtures students' love of learning and faith, creating an enriching and transformational educational experience.
 , BS (Aerospace Engineering)
By Prajesh
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Prajesh
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Quizzes Created: 9 | Total Attempts: 49,852
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  • 1/23 Questions

    What should you do to prevent accidents and injuries in the workshop?  

    • Ignore rules
    • Follow rules
    • Use tools randomly
    • Rely on luck
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About This Quiz


Welcome to our Electrical Installation Quiz, designed to evaluate and enhance your knowledge of electrical systems and practices. Whether you're an aspiring electrician, a seasoned professional, or just someone interested in understanding the complexities of electrical installations, this quiz offers a valuable learning opportunity.

Our quiz covers a wide range of topics, from basic wiring techniques and component identification to in-depth questions on safety standards and compliance with national electrical codes. Each question has been carefully crafted to challenge your understanding and help solidify your grasp of essential electrical concepts.

Participants will encounter a variety of question types, including multiple choice, true/false, and scenario-based inquiries that mimic real-life situations faced by electricians daily. This format ensures that you not only recall information but also apply your knowledge practically.

Electrical Installation Quiz - Quiz

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  • 2. 

    What must you do to the power supply before working on a circuit?

    • Switch on

    • Switch off

    • Hold

    • Throw

    Correct Answer
    A. Switch off
    Explanation
    Before working on a circuit, you must switch off the power supply. Turning off the power ensures that no electrical current flows through the circuit while you are working on it, preventing the risk of electric shock, injury, or damage to the components. Always double-check that the power is completely off by using a voltage tester or similar device. This safety precaution is crucial to protect yourself and ensure a safe working environment when handling electrical systems.

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  • 3. 

    Mandatory signs are used to indicate that a specific course of action must be taken.

    • True

    • False

    Correct Answer
    A. True
    Explanation
    Mandatory signs are indeed used to indicate that a specific course of action must be taken. These signs are typically in the form of a white symbol or word on a blue background, and they are used to convey instructions or requirements that drivers or pedestrians must follow. Ignoring or disobeying these signs can result in penalties or hazards, making it important for individuals to adhere to the indicated actions.

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  • 4. 

    Which component is used to manually control the opening and closing of an electrical circuit?

    • Relay

    • Switch

    • Resistor

    • Capacitor

    Correct Answer
    A. Switch
    Explanation
    A switch is a component used to manually control the opening and closing of an electrical circuit. When the switch is turned on (closed), it allows electrical current to flow through the circuit. When the switch is turned off (open), it breaks the circuit, stopping the flow of electricity. Switches are essential components in many electrical devices and systems, enabling users to control the power supply easily and safely. Understanding the function of switches is fundamental in electrical engineering and everyday applications involving electrical circuits.

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  • 5. 

    RCD stands for the residual current devices.

    • True

    • False

    Correct Answer
    A. True
    Explanation
    RCD stands for Residual Current Devices, which are electrical safety devices designed to protect against electric shock and fire hazards. They work by monitoring the flow of electric current and quickly shutting off the power if a leakage or imbalance is detected. This helps to prevent potentially dangerous situations and provides an additional layer of protection in electrical circuits. Therefore, the statement "RCD stands for the residual current devices" is true.

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  • 6. 
    Pin number 4 of the plug is connected to  - ProProfs

    Pin number 4 of the plug is connected to 

    • Earth

    • Live

    • Neutral

    • Fuse

    Correct Answer
    A. Earth
    Explanation
    Pin number 4 of the plug is connected to Earth. The Earth pin is responsible for grounding the electrical appliance and providing a safe path for any excess electrical current to flow into the ground. This is crucial for preventing electrical shocks and ensuring the safety of the user. The Earth pin in electrical plugs and outlets serves two main purposes:
    Grounding: It connects the appliance to the ground, stabilizing voltage and preventing electrical surges.
    Safety: It provides a safe path for excess electrical current to flow into the ground, reducing the risk of electrical shocks and protecting users and devices.

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  • 7. 

    How is electricity made at a power plant?

    • Motor

    • Generator

    • Coil

    • Wire

    Correct Answer
    A. Generator
    Explanation
    Electricity is made at a power plant by a huge generator. A generator converts mechanical energy into electrical energy through the process of electromagnetic induction. This is typically achieved by rotating a coil of wire within a magnetic field, which induces an electric current in the wire. The mechanical energy required to rotate the coil can come from various sources, such as steam turbines, water turbines, or wind turbines. Generators are essential components of power plants, enabling the large-scale production of electricity that is then transmitted to homes, businesses, and industries.

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  • 8. 

    One of the devices is not used for protection.

    • RCD

    • MCB

    • FUSE

    • Socket

    Correct Answer
    A. Socket
    Explanation
    The RCD (Residual Current Device), MCB (Miniature Circuit Breaker), and Fuse are all devices used for protection in electrical circuits. They help to prevent electrical hazards such as short circuits and electrical fires. However, a socket is not typically used for protection but rather for providing an outlet for electrical devices to be plugged into. Therefore, the socket is the device in the given list that is not used for protection.

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  • 9. 
    The meter shown in the picture is - ProProfs

    The meter shown in the picture is

    • Multimeter

    • Voltameter

    • Power meter

    • None of the above

    Correct Answer
    A. Power meter
    Explanation
    The meter shown in the picture is a power meter. This can be determined by analyzing the design and features of the meter, such as the presence of power measurement symbols, wattage units, and other indicators commonly found in power meters. A power meter is used to measure the electrical power consumption or generation of a device or circuit, making it the most suitable option among the given choices.

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  • 10. 

    Which device is specifically designed to prevent electrical shock?

    • Transformer

    • GFCI

    • Capacitor

    • Resistor

    Correct Answer
    A. GFCI
    Explanation
    A Ground Fault Circuit Interrupter (GFCI) is a safety device that protects against electrical shock. It works by monitoring the electrical current in a circuit and quickly shutting off the power if it detects any imbalance, such as current leaking through a person. This rapid action helps prevent serious injuries from electrical shocks. GFCIs are particularly important in areas where electricity is used near water, such as bathrooms and kitchens, making them a critical component in modern electrical safety standards.

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  • 11. 

    Green/Yellow wire is always considered as part of the live circuit.

    • True

    • False

    Correct Answer
    A. False
    Explanation
    The given statement is false. Green/Yellow wire is not always considered as part of the live circuit. In electrical wiring, the green/yellow wire is typically used as the protective earth wire or ground wire. It is used to provide a safe path for electrical current to flow in case of a fault or short circuit, and it is not intended to carry the live current. The live circuit is usually carried by wires of different colors, such as black or brown.

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  • 12. 

    What is the difference between a fuse and a circuit breaker (CB)?

    • Fuse can be used many times but CB only once.

    • Fuse can be used only once, but CB can be used many times.

    • Fuse and CB can use any number of times

    • All of the above

    Correct Answer
    A. Fuse can be used only once, but CB can be used many times.
    Explanation
    A fuse can be used only once because it contains a metal wire or strip that melts when too much current flows through it, breaking the circuit and stopping the flow of electricity. Once a fuse blows, it must be replaced. In contrast, a circuit breaker (CB) can be used many times. It is an automatic switch that interrupts the electrical flow when an overload or short circuit occurs. Once the problem is resolved, the circuit breaker can be reset and used again. Understanding this difference is crucial for maintaining electrical safety and ensuring proper function in electrical systems.

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  • 13. 

    What should be done to all exposed metal in the electrical circuit?

    • Earthed

    • Connected

    • Kept away

    • Painted

    Correct Answer
    A. Earthed
    Explanation
    All exposed metal in an electrical circuit should be earthed (or grounded). Earthing ensures that in the event of a fault, such as a short circuit, the excess electrical current has a safe path to the ground. This helps prevent electric shocks, fires, and other hazards by stabilizing the voltage levels and ensuring that any stray currents are safely discharged into the earth. Proper earthing is a critical safety measure in electrical systems, protecting both people and equipment from electrical dangers.

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  • 14. 

    What is the function of the shaft in a screwdriver?

    • To hold the screwdriver

    • To connect the head and handle

    • To rotate the screws

    • To provide a comfortable grip

    Correct Answer
    A. To connect the head and handle
    Explanation
    The shaft of a screwdriver serves to connect the head (or tip) of the screwdriver to the handle. It is typically made of metal and provides the necessary length and rigidity to transfer the torque applied by the user from the handle to the screw. The shaft ensures that the force is efficiently directed to rotate the screw, enabling the user to drive or remove screws effectively. Properly understanding the function of each part of a tool, like the shaft in a screwdriver, is essential for using tools correctly and safely.

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  • 15. 
    Pin number 2 is connected to   - ProProfs

    Pin number 2 is connected to  

    • Earth

    • Live

    • Neutral

    • Fuse

    Correct Answer
    A. Live
    Explanation
    Pin number 2 is connected to the Live wire. In electrical systems, the Live wire carries the current from the power source to the device, while the Neutral wire completes the circuit. The Earth wire is used for safety purposes to prevent electric shocks. The Fuse is a protective device that interrupts the flow of current in case of an overload or short circuit. Therefore, based on the given options, the correct answer is Live.

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  • 16. 

    What is the purpose of a cable gland in electrical installations?

    • Attach and seal

    • Increase conductivity

    • Identify cables

    • Reduce cost

    Correct Answer
    A. Attach and seal
    Explanation
    The purpose of a cable gland in electrical installations is to securely attach and seal the cable to the equipment. Cable glands provide strain relief and protect the cable from being pulled out or damaged. They also ensure a tight seal, preventing dust, dirt, and moisture from entering the equipment through the cable entry point. This helps maintain the integrity of the electrical connection and protects the equipment from environmental factors, enhancing safety and reliability in electrical installations.

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  • 17. 

    Overload currents occur when 

    • Equipment is overloaded

    • Installation is abused

    • Installation has been badly designed

    • All of the above

    Correct Answer
    A. All of the above
    Explanation
    Overload currents occur when equipment is overloaded, meaning it is being used beyond its capacity or rated limits. They can also occur when the installation is abused, for example, by using equipment in a way it was not intended or by subjecting it to excessive stress or misuse. Additionally, overload currents can be caused by a badly designed installation, where the electrical system is not properly designed or sized to handle the load requirements. Therefore, all of the given options contribute to the occurrence of overload currents.

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  • 18. 

    Fuse is used to protect the circuit against earth leakage current.

    • True

    • False

    Correct Answer
    A. False
    Explanation
    Fuses are not used to protect the circuit against earth leakage current. Instead, they are used to protect the circuit against excessive current flow. Earth leakage current is typically protected by devices such as residual current devices (RCDs) or ground fault circuit interrupters (GFCIs).

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  • 19. 
    The sign shown in the picture is  - ProProfs

    The sign shown in the picture is 

    • Warning

    • Advisory

    • Mandatory

    • None of the above

    Correct Answer
    A. Advisory
    Explanation
    The sign shown in the picture is likely an advisory sign. Advisory signs are used to provide guidance or suggestions to drivers about potential hazards or conditions on the road ahead. They are usually diamond-shaped with a yellow background and black symbols or text. These signs are not mandatory, but they inform drivers about specific situations or actions they should consider taking while driving.

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  • 20. 
    The shown below figure is called   - ProProfs

    The shown below figure is called  

    • Consumer unit

    • MCB

    • RCD

    • LCD

    Correct Answer
    A. Consumer unit
    Explanation
    The figure shown below is called a consumer unit. A consumer unit is an electrical distribution board that controls and distributes electricity throughout a building or premises. It contains various components such as MCBs (Miniature Circuit Breakers) which protect individual circuits from overloading or short circuits, RCDs (Residual Current Devices) which provide protection against electric shocks, and LCDs (Liquid Crystal Displays) which may be used for displaying information such as power consumption or fault indicators. The consumer unit is an essential part of the electrical system in a building, ensuring safety and proper distribution of electricity.

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  • 21. 

    The severity of an electric shock depends more on the voltage when compared to the current.

    • True

    • False

    Correct Answer
    A. False
    Explanation
    The severity of an electric shock depends more on the current rather than the voltage. While voltage determines the potential for electric shock, it is the current that actually flows through the body and causes harm. Even a low voltage can be dangerous if there is a high current flow. Therefore, the statement that the severity of an electric shock depends more on the voltage is false.

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  • 22. 

    What does the term 'IP rating' refer to in electrical installations?

    • Intellectual Property

    • Initial Power

    • Ingress Protection

    • Interest Percentage

    Correct Answer
    A. Ingress Protection
    Explanation
    The term 'IP rating' stands for Ingress Protection rating, which indicates the level of sealing effectiveness of electrical enclosures against intrusions such as dust, water, and other foreign bodies. The IP rating is defined by the international standard IEC 60529 and consists of two digits. The first digit represents the level of protection against solid objects, and the second digit represents the level of protection against liquids. Understanding IP ratings is crucial for selecting appropriate electrical enclosures for various environments, ensuring safety and reliability in electrical installations.

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  • 23. 

    What is the accepted lethal level of shock current passing through a person?

    • 10mA

    • 20mA

    • 30mA

    • 50mA

    Correct Answer
    A. 50mA
    Explanation
    The accepted lethal level of shock current passing through a person is about 50mA (milliamperes). When current levels reach or exceed 50mA, they can cause severe injury or death by disrupting the normal functioning of the heart and other vital organs. At this level, the current can lead to ventricular fibrillation, a life-threatening condition where the heart's rhythm becomes erratic and cannot pump blood effectively. Understanding the dangers of electrical current levels is essential for ensuring safety when working with or around electricity, emphasizing the need for proper precautions and protective measures.

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Matt Balanda |BS (Aerospace Engineering) |
Science Teacher
Matt Balanda, a Calvary Chapel Christian School leader with a Bachelor's in Aerospace Engineering and Mathematics, transitioned from Aerospace Engineering to Education with a Master's from California Baptist University. As the High School Vice-Principal and Physics teacher, he nurtures students' love of learning and faith, creating an enriching and transformational educational experience.

Quiz Review Timeline (Updated): Jun 25, 2025 +

Our quizzes are rigorously reviewed, monitored and continuously updated by our expert board to maintain accuracy, relevance, and timeliness.

  • Current Version
  • Jun 25, 2025
    Quiz Edited by
    ProProfs Editorial Team

    Expert Reviewed by
    Matt Balanda
  • May 09, 2013
    Quiz Created by
    Prajesh
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