# Electrical Installation Quiz Questions And Answers

Reviewed by Matt Balanda
Matt Balanda, BS, Science |
Physics Expert
Review Board Member
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.
, BS, Science
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What do you know about electrical installation? Would you like to try this electrical installation quiz? This quiz requires you to find out what to do when you begin working on a circuit, the lethal amount of shock current, the severity of electric shock depending on, and what RCD stands for. You will also be asked to identify items in a picture. This quiz will show you the science behind electrical installation. You will get to learn new things also. All the best! Share the quiz with your friends as well.

• 1.

### Electric Shock occurs when a person becomes part of the

• A.

Circuit

• B.

Path

• C.

Team

• D.

Hazard

A. Circuit
Explanation
When a person becomes part of the circuit, it means that they have come into contact with an electrical conductor and have provided a path for the flow of electric current. This can happen if they touch a live wire or a faulty electrical appliance. Electric shock occurs when the current passes through the person's body, causing injury or even death. Therefore, the correct answer is "circuit".

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• 2.

### All exposed metal in the electrical circuit should be

• A.

Earthed

• B.

Connected

• C.

Kept away

• D.

Painted

A. Earthed
Explanation
In an electrical circuit, it is important to earth or ground all exposed metal. This is done to provide a safe path for electric current in case of a fault or short circuit. By connecting the metal to the earth, any excess current will flow harmlessly into the ground instead of causing damage or posing a risk to people. This helps to prevent electrical shocks, fires, and other hazards that could occur if the metal was not properly earthed.

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• 3.

### Before working on a circuit, you must ........................... the power supply.

• A.

Switch on

• B.

Switch off

• C.

Hold

• D.

Throw

B. Switch off
Explanation
Before working on a circuit, it is necessary to switch off the power supply. This is important to ensure safety and prevent any electrical accidents or damage. By switching off the power supply, you are cutting off the flow of electricity and reducing the risk of electric shock or short circuits. It allows you to work on the circuit without any power running through it, minimizing the chances of getting injured or causing any damage to the components.

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• 4.

### The accepted lethal level of shock current passing through a person is about

• A.

10mA

• B.

20mA

• C.

30mA

• D.

50mA

D. 50mA
Explanation
The accepted lethal level of shock current passing through a person is about 50mA (milliamperes). This level of current is considered to be potentially lethal, as it can disrupt the normal electrical activity of the heart and lead to cardiac arrest. Currents below this level may still cause harm, but they are generally less likely to be immediately life-threatening. It's important to prioritize electrical safety to prevent exposure to such currents.

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• 5.

### Electricity is made at a power plant by a huge.

• A.

Motor

• B.

Generator

• C.

Coil

• D.

Wire

B. Generator
Explanation
Electricity is made at a power plant by a generator. A generator is a device that converts mechanical energy into electrical energy. It consists of a rotating coil of wire called an armature, which is connected to a source of mechanical energy such as a motor. As the armature rotates within a magnetic field, it induces a flow of electrons, generating electricity. Therefore, a generator is the correct answer for how electricity is made at a power plant.

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• 6.

### To prevent accidents and injuries in the workshop, you must understand and follow safety rules.

• A.

True

• B.

False

A. True
Explanation
Following safety rules is crucial in preventing accidents and injuries in a workshop. By understanding and adhering to these rules, individuals can minimize risks and create a safer working environment. This includes wearing appropriate protective gear, using equipment correctly, maintaining a clean and organized workspace, and being aware of potential hazards. By prioritizing safety, individuals can reduce the likelihood of accidents and ensure the well-being of themselves and others in the workshop.

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• 7.

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

• A.

True

• B.

False

B. 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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• 8.

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

• A.

True

• B.

False

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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• 9.

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

• A.

True

• B.

False

B. 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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• 10.

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

• A.

True

• B.

False

B. 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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• 11.

### RCD stands for the residual current devices.

• A.

True

• B.

False

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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• 12.

### Pin number 2 is connected to

• A.

Earth

• B.

Live

• C.

Neutral

• D.

Fuse

B. 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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• 13.

### Pin number 4 of the plug is connected to

• A.

Earth

• B.

Live

• C.

Neutral

• D.

Fuse

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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• 14.

### What is the function of the shaft in a screwdriver?

• A.

To hold the screwdriver

• B.

To connect the head and handle

• C.

To rotate the screws

• D.

To provide a comfortable grip

B. To connect the head and handle
Explanation
The shaft in a screwdriver serves the purpose of connecting the head, which interacts with the screws, to the handle that provides the user with a grip. It ensures the efficient transmission of rotational force while using the tool.

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• 15.

### The sign shown in the picture is

• A.

Warning

• B.

• C.

Mandatory

• D.

None of the above

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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• 16.

### The meter shown in the picture is

• A.

Multimeter

• B.

Voltameter

• C.

Power meter

• D.

None of the above

C. 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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• 17.

• A.

• B.

Installation is abused

• C.

• D.

All of the above

D. 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.

### The shown below figure is called

• A.

Consumer unit

• B.

MCB

• C.

RCD

• D.

LCD

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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• 19.

### The difference between a FUSE and a Circuit Breaker (CB)

• A.

Fuse can be used many times but CB only once.

• B.

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

• C.

Fuse and CB can use any number of times

• D.

All of the above

B. Fuse can be used only once, but CB can be used many times.
Explanation
The correct answer is "Fuse only once and, but CB many times". This means that a fuse can only be used once and needs to be replaced after it blows, while a circuit breaker can be used multiple times as it can be reset after tripping.

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• 20.

### One of the devices is not used for protection.

• A.

RCD

• B.

MCB

• C.

FUSE

• D.

Socket

D. 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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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
• Mar 19, 2024
Quiz Edited by
ProProfs Editorial Team

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

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