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WorksheetsElectrical Safety Quiz
Total questions: 65
Worksheet time: 33mins
Why is it important to be careful around voltage supplies?
Because voltage supplies can be dangerous and cause harm.
Because voltage supplies are always safe to touch.
Because voltage supplies are only used for decoration.
Because voltage supplies do not need any safety rules.
When lifting something heavy, what is the correct way to handle it according to the old saying for manual handling?
Bend your knees not your BACK
Bend your back not your knees
Lift with your arms only
Twist your body while lifting
In an emergency, are you allowed to use your mobile phone?
YES as time is essential
NO, you should wait for help
Only if you have permission
Never use your phone in emergencies
Which of the following information is important and relevant to pass on to emergency services?
Address, nature of emergency, exact location, number of people injured and types of injuries, your contact details
Your favorite color and food
The weather outside
The time you woke up today
If you are given a set of electrical supplies, tools, and equipment, what should you do to make sure they are suitable for your class?
Assess them to check if they are appropriate
Ignore them and use any available items
Only use the ones that look new
Ask someone else to choose for you
When working on a construction site, how can you make sure you are using the correct voltages for plant and equipment?
Identify the recommended voltages for distribution
Use the highest voltage available
Use any voltage without checking
Only use voltages that are less than 100 volts
How can you determine the voltage used for socket outlets in a safe way?
Use the colour code for voltage identification
Guess the voltage based on the size of the socket
Use the same voltage for all outlets
Ask a friend for their opinion
If someone touches a high voltage electrical wire on a construction site, which of the following injuries could they experience?
Electric shock
Sunburn
Broken bone
Frostbite
Which of these is a possible result of an electrical accident on a work site?
Loss of muscle control
Getting wet from rain
Getting stuck in mud
Getting a paper cut
What can happen if there is arcing and explosion from electrical supplies on a site?
Fires can start
Plants can grow faster
The site becomes quieter
The air smells sweet
Why is the risk of injury generally greater with higher voltages on a construction site?
Higher voltages can cause more serious injuries
Higher voltages make the site cleaner
Higher voltages make people work faster
Higher voltages make the weather better
If you see a broken equipment case exposing internal bare live connections, what should you do to stay safe?
Touch the exposed parts to see if they work
Tell an adult or teacher about it
Try to fix it yourself
Ignore it and walk away
Why can a cracked equipment case be dangerous?
It can make the equipment look old
It can cause 'tracking' from internal live parts to the outside, making it unsafe to touch
It makes the equipment heavier
It makes the equipment work faster
What is a possible danger if the supply cord insulation is damaged?
The equipment will be quieter
The cord will look nicer
Bare live conductors may be exposed, which can cause electric shock
The equipment will use less electricity
If you see a broken plug exposing bare live connections, what should you do?
Plug it in and use it
Tell an adult or teacher right away
Paint the plug to cover it
Put tape on it and use it
Which of the following is an example of an electrical danger that can happen if the covering around a wire is broken?
Damaged insulation
Proximity of cables
Trailing cables
Buried cables
If you see many cables lying loosely on the floor, which electrical danger does this situation show?
Exposed conductors
Trailing cables
Faulty electrical equipment
Damaged insulation
Why is it dangerous to use electrical equipment that is not working properly?
It can cause electrical dangers
It saves electricity
It makes equipment last longer
It is always safe
Which of the following is NOT a danger related to electricity?
Exposed conductors
Worn electrical cables
Eating food
Damaged insulation
Which of the following is an advantage of using battery-powered tools in building services?
They have no trailing leads.
They always need to be plugged in.
They are heavier than other tools.
They cannot be used anywhere.
Why are battery-powered tools safer to use compared to some other tools?
They have voltage levels that mean there is no risk of electric shock.
They are made of plastic.
They are always used outside.
They do not need batteries.
How do battery-powered tools help when there is no mains electricity supply?
They can be used if their batteries are charged elsewhere.
They stop working immediately.
They need to be plugged in all the time.
They cannot be used at all.
What is one way battery-powered tools help workers move around more easily?
They give greater mobility.
They are always very large.
They must be used in one place.
They have long wires.
Why is it important for portable electric tools to have different means of maintaining safety in relation to their electrical supply?
To make the tools look more interesting
To protect users from electric shock
To make the tools heavier
To use more electricity
How are electrical equipment for protection against electric shock classified?
By their color
By their size
Into three groups: Class I, Class II, and Class III
By their price
If you are using a portable electric tool, which sources of electrical supply might it use?
Only solar power
Only wind power
Mains or battery
Only water power
Three symbols: one with a circle and three horizontal lines, one with a square and another square inside, and one with a circle and a diamond with three vertical lines inside. These represent Class I, Class II, and Class III electrical equipment. What do these symbols show?
These symbols show different types of electrical equipment classes for safety.
These symbols show different types of batteries.
These symbols show different types of wires.
These symbols show different types of switches.
Which of the following is a feature of Class I electrical appliances?
They have three cables and a metal Earth pin.
They are always made of plastic.
They do not need to be earthed.
They never have a fuse in the plug.
Which of these is an example of a Class I appliance?
Refrigerator
Wooden chair
Plastic cup
Book
How can you confirm if an appliance is Class I?
By looking for the Class I symbol on the appliance
By checking if it is heavy
By seeing if it is colorful
By asking a friend
Why must external conductive parts of Class I appliances be earthed?
To protect against electric shock
To make the appliance look shiny
To keep the appliance warm
To help the appliance make noise
Why do Class II appliances not need an earth connection?
Because they have double insulation
Because they use more electricity
Because they are always made of metal
Because they are very small
Which of the following is an example of a Class II appliance?
Hair dryer
Refrigerator
Washing machine
Oven
What is the purpose of the plastic casing in Class II appliances?
It provides backup protection
It makes the appliance look nice
It helps the appliance work faster
It keeps the appliance cool
What do the two layers of insulation in Class II appliances do?
They protect against electric shock
They make the appliance heavier
They help the appliance use less power
They make the appliance more expensive
Why is the Class III method of protection used in electrical appliances?
To completely prevent electric shock
To reduce the severity of electric shock and make it more survivable
To increase the voltage in appliances
To make appliances work faster
Which of the following is an example of a Class III appliance?
Refrigerator
Laptop
Washing machine
Electric oven
What is the maximum supply voltage allowed for Class III appliances?
100 V AC
230 V AC
50 V AC
12 V AC
How does an isolating transformer help protect Class III appliances?
By connecting both windings to the same power source
By using two separate coil windings to keep the appliance and power source apart
By increasing the voltage to the appliance
By making the appliance heavier
If you are working with a fixed plant such as a crane on a construction site, which voltage is recommended for its electrical supply?
400V
230V
110V
SELV
Which voltage should be used for portable tools and hand lamps on a construction site?
400V
230V
110V
SELV
If you need to supply electricity to site offices and fixed flood lighting, which voltage is recommended?
400V
230V
110V
SELV
Which type of electrical supply is recommended for portable lamps used in damp and confined places?
400V
230V
110V
SELV
If a socket outlet is coloured yellow, what voltage does it identify?
110V
25V
230V
400V
Why is it safer to reduce the system voltage to around 50V when working with electrical supplies?
Because the current flow through the body will be significantly reduced
Because the wires become stronger
Because the colours change
Because the tools work faster
Match the socket outlet colour to its voltage: Blue is used for which voltage?
230V
25V
50V
400V
If you see a socket outlet coloured red, what voltage should you expect?
400V
110V
25V
50V
Why is a reduced low voltage system considered safer than using mains-operated (230 V) equipment?
Because it uses more wires
Because it has a lower potential shock voltage
Because it is more expensive
Because it is faster
What is the maximum voltage to earth from a 230/110 V step-down transformer with a centre-tapped secondary winding?
230 V
110 V
55 V
12 V
In the UK, what type of transformer is commonly used for low-voltage electrical supplies to reduce the risk of electric shock?
Single-wound transformer
Double-wound step-down transformer
Step-up transformer
Solar transformer
What happens if you touch either pole and earth in a centre-tapped transformer system?
You get a shock of 230 V
You get a shock of 110 V
You get a shock of 55 V, which in most cases will not cause harm
You get no shock at all
Why is it important to regularly inspect and test portable appliances?
To confirm the equipment remains in a safe condition
To make the equipment look new
To increase the speed of the equipment
To reduce the size of the equipment
What does Portable Appliance Testing (PAT) help to ensure?
That electrical appliances are safe to use
That appliances are expensive
That appliances are colorful
That appliances are heavy
Which of the following is a type of in-service inspection for portable tools and equipment?
User checks (pre-use inspections)
Painting the equipment
Making the equipment louder
Changing the equipment’s color
What should users look for during pre-use inspections of equipment?
Signs of damage or obvious defects
The brand name of the equipment
The color of the equipment
The price of the equipment
Which inspection involves both checking and testing equipment periodically?
Periodic combined inspection and testing
Only looking at the equipment
Only cleaning the equipment
Only using the equipment
If you are checking a portable appliance, which of the following is a correct way to inspect the casing?
Make sure there are no visible dents or cracks.
Ignore any damage you see.
Only check the color of the casing.
Remove the casing completely.
When inspecting supply leads, what should you do to make sure they are safe?
Check that there are no cuts or fraying.
Only look at the color of the lead.
Pull the lead to see if it breaks.
Ignore any damage to the lead.
What is important to check about the switches on portable equipment during a visual inspection?
Make sure the switches operate correctly.
Make sure the switches are painted.
Make sure the switches are hidden.
Make sure the switches are loose.
Why should you check for exposed live conductors or damaged insulation on supply leads?
To prevent electrical accidents.
To make the lead look nice.
To change the color of the lead.
To make the lead longer.
What should you look for when inspecting the plug of a supply lead?
The insulation should have no damage.
The plug should be very hot.
The plug should be painted red.
The plug should be loose.
Why is visual examination considered an essential part of electrical safety checks for portable appliances?
Because some defects can only be found by visual examination and not by testing.
Because visual examination is faster than testing.
Because testing is not needed for electrical appliances.
Because visual examination is only for broken earth conductors.
What should be done if a portable appliance is found to be unsafe during a visual inspection?
It must be removed from service immediately and labelled as unsafe.
It should be used with caution.
It should be ignored and left in service.
It should be cleaned and put back into use.
If no defects are found during a visual inspection of a portable appliance, what record needs to be kept?
No record is needed.
A detailed report must be written.
A photograph must be taken.
A sticker must be placed on the appliance.
What percentage of faults can be identified if user checks are carried out as described?
95%
50%
75%
100%
