WorksheetsHealth and Safety and Industry Practices Quiz
Total questions: 85
Worksheet time: 43mins
Why is it important to learn about voltage supplies?
To understand high voltages
To stay safe around electricity
To understand ohms law
To understand power law
If you see a warning sign with a lightning bolt, what should you do?
Stay away and be careful
Touch it to see what happens
Ignore it
Play near it
When lifting something heavy, what should you do according to the old saying for manual handling?
Bend your knees not your BACK
Bend your arms not your knees
Lift with your back not your legs
Jump while lifting
Are you allowed to use your mobile phone in an emergency?
YES as time is essential
No, never use your phone
Only if you have permission
Only if you are outside
Which of the following is NOT important information to give to emergency services?
Your favorite color
Address
Nature of emergency
Your contact details
Imagine you see someone get hurt and you need to call emergency services. What information should you plan to give them? (Choose all that apply)
Address, nature of emergency, exact location, number of people injured, your contact details
your insurance number
Only your name and nothing else
Just the address and hang up
Which of the following is recommended to be identified for distributing to plant and equipment on construction sites?
The voltages
The number of equipment
The color of the equipment
The type of equipment
If you are guided by the colour code for voltage identification, what are you trying to do?
Establish the voltage used for industrial socket outlets
Choose the best color for industrial socket outlets
Count the number of industrial socket outlets
choose the most used industrial socket outlets
Imagine you are setting up equipment on a construction site. Why is it important to identify the recommended voltages?
To ensure safety and proper functioning of equipment
To make the site look good
To ensure proper functioning of equipment
To use as many Electrical cables as possible
What are two types of electrical current that can cause injuries on a construction site?
Alternating Current (AC) and Direct Current (DC)
Alternating Current (AC)
Direct Current (DC)
Separated Extra Low Voltage (SELV)
Which of the following is a possible injury caused by electrical supplies?
Electric shock
Broken bone
Sunburn
Headache
Which of these is NOT listed as a danger from electrical injuries on site?
Electrical burns
Loss of muscle control
Fires arising from electrical causes
Getting wet cold
If you see a sign that says "Dangers on site," what should you do to stay safe? (Use your reasoning to answer.)
Be careful and follow safety rules
Run and play near the danger
Ignore the sign
Touch all the equipment
Why is the risk of injury generally greater with higher voltages?
Because higher voltages can cause more serious injuries
Because higher voltages are always cold
Because higher voltages are less dangerous
Because higher voltages make things taste better
Which of the following is a result of arcing and explosion caused by electrical supplies?
Injury or damage on site
Making the site cleaner
Making the site quieter
Making the site cooler
What is one way an electric shock can happen?
By direct contact with a live part
By touching a plastic toy
By drinking water
By reading a book
Which of the following is an example of a fault that can cause electric shock?
Broken equipment case exposing internal bare live connections
A closed window
A working flashlight
A clean table
If a supply cord has damaged insulation, what might happen?
Bare live conductors could be exposed
The cord will become longer
The cord will change color
The cord will make music
Why is a cracked equipment case dangerous?
It can cause 'tracking' from internal live parts to the external surface
It makes the equipment look old
It makes the equipment lighter
It makes the equipment colorful
Imagine you see a broken plug with wires showing. What should you do to stay safe?
Tell an adult and do not touch it
Touch the wires to see if they are hot
Plug it in to see if it works
Paint the plug
Which of the following is a danger related to electricity?
Faulty electrical equipment
Clean water
Fresh fruit
Soft pillows
What can happen if electrical cables are worn or damaged?
It can be dangerous
It will make the room look nice
It will help you sleep better
It will make the cables stronger
Which of these is NOT a danger related to electricity?
Exposed conductors
Damaged insulation
Trailing cables
Eating vegetables
Why is it important to know about buried or hidden cables?
So you don’t accidentally damage them or get hurt
So you can play with them
So you can paint them
So you can hide your toys
What is one advantage of using battery-powered tools?
No trailing leads
They are heavier
They need more wires
They use more electricity
Why are battery-powered tools safer to use?
Because they have voltage levels that mean there is no risk of electric shock
Because they are always red
Because they are bigger
Because they make more noise
Which of the following is true about battery-powered tools?
They can be used where there are no mains supplies
They only work near a power socket
They cannot be used outside
They need to be plugged in all the time
Which of the following is NOT a class of electrical equipment for protection against electric shock?
Class IV
Class I
Class II
Class III
Look at the three symbols shown. If you had to design a new symbol for a fourth class, what shapes or lines might you use to make it look different from the others? Explain your idea.
I would use a triangle with a circle inside to make it different.
I would use the same symbol as Class I.
I would use the same symbol as Class II.
I would use the same symbol as Class III.
What is one way to protect against electric shock?
Using basic insulation
Touching metal parts
Ignoring safety rules
Using only one wire
What does the basic insulation in electrical devices do?
It helps protect against electric shock
It makes the device heavier
It changes the color of the device
It makes the device louder
What is an example of an external conductive part that must be earthed?
Metal case
Plastic cover
Rubber handle
Wooden frame
Why must external conductive parts be earthed using a three-core supply lead?
To protect people from electric shock by providing a safe path for electricity
To make the device look better
To make the device lighter
To save electricity
If you see a device labeled "Class I" with a symbol like the one shown, what does it mean?
It has extra protection against electric shock
It is only for outdoor use
It is a toy
It cannot be used with electricity
Which of the following is an example of a Class I appliance?
Refrigerator
Television
Table
Chair
How many cables do Class I appliances usually have?
Three
One
Two
Four
What is the only way to confirm if an appliance is Class I?
Look for the Class I symbol on the appliance
Check the color of the appliance
Ask a friend
See if it makes noise
Which of these is NOT usually found in a Class I appliance?
Plastic handle
Metal earth pin
Three cables
Fuse in the plug
If you are planning to buy a safe appliance, what should you look for to confirm it is Class I?
The Class I symbol on the appliance
The price tag
The color of the appliance
The size of the appliance
What is the main purpose of Class II equipment?
To protect against electric shock
To make equipment heavier
To use more electricity
To make equipment look better
Which of the following is true about Class II equipment?
It has no external conductive parts apart from fixing screws.
It always has many external conductive parts.
It does not need insulation.
It is only used outdoors.
What does adequate insulation in Class II equipment do?
It keeps any external conductive parts from becoming live.
It makes the equipment colorful.
It helps the equipment make noise.
It makes the equipment lighter.
If you were designing a piece of equipment to prevent electric shock, what feature would you include based on Class II equipment?
Adequate insulation between external conductive parts and internal live parts
No insulation at all
Lots of exposed wires
No screws to hold it together
Which of the following is an example of a class II appliance?
Hair dryer
Refrigerator
Washing machine
Microwave oven
What is special about class II appliances?
They have two layers of insulation
They use more electricity
They are always very small
They need water to work
Why do class II appliances not need an earth connection?
Because they have double insulation
Because they are always turned off
Because they are made of metal
Because they are very expensive
Which part provides the basic insulation in class II appliances?
Plastic connector
Metal wire
Rubber band
Glass cover
What does the added layer of insulation in class II appliances do?
Provides backup protection
Makes the appliance heavier
Makes the appliance colorful
Uses more electricity
Imagine you are buying a new television. How can you tell if it is a class II appliance and does not need an earth connection?
It has two layers of insulation and a plastic casing
It is very heavy
It is always black in color
It comes with a remote control
If you see the symbol with two squares, one inside the other, on an appliance, what does it mean?
It is a class II appliance with double insulation
It is a class I appliance
It needs to be earthed
It is broken
What is the main purpose of protection against electric shock as described in the image?
To reduce the severity of the shock
To completely prevent electric shock
To increase the voltage
To make the shock more dangerous
What is the maximum voltage allowed for the supply in this method of protection?
No greater than 50 V AC
No greater than 100 V AC
No greater than 10 V AC
No greater than 200 V AC
Which type of source is mentioned for providing the supply in this protection method?
Separated Extra-Low-Voltage (SELV) source
High voltage power line
Solar panel only
Wind turbine only
What is an example of a source that can provide Separated Extra-Low-Voltage (SELV)?
A safety isolating transformer or a battery
A car engine
A water pump
A light bulb
What class is associated with this method of protection against electric shock?
Class III
Class I
Class II
Class IV
Why is it important to use a supply of no greater than 50 V AC for protection against electric shock?
Because lower voltage reduces the severity of the shock and makes it more survivable
Because higher voltage is cheaper
Because it makes the equipment heavier
Because it increases the risk of shock
Imagine you are designing a toy that uses electricity. Which supply would you choose to make it safer for children, based on the information in the image?
A supply with no greater than 50 V AC from a SELV source
A supply with 220 V AC from a wall socket
A supply with 100 V DC from a car battery
A supply with 400 V from a power station
Which of the following is an example of a Class III appliance?
Laptops
Refrigerators
Washing machines
Television sets
What do Class III appliances use for protection against electric shock?
Isolating transformer
Battery
Solar panel
Electric motor
What are the two separate coil windings in a transformer called?
Primary Winding and Secondary Winding
First Coil and Second Coil
Input Coil and Output Coil
Main Coil and Side Coil
If you are planning to design a safe mobile phone charger, which type of transformer should you use to protect against electric shock?
Isolating transformer
Step-up transformer
Step-down transformer
Rotary transformer
Why are the primary and secondary windings wrapped around opposite sides of the core in a transformer?
To create a common closed magnetic circuit
To make the transformer look nice
To use less wire
To make it easier to carry
What do temporary electrical supplies provide energy for on construction sites?
Fixed and portable tools and lighting
Only food and water
Only computers and printers
Only vehicles and roads
Why must temporary lighting supplies on construction sites be safe?
Because construction sites can be dangerous
Because they are used for cooking
Because they are used for painting
Because they are used for gardening
Imagine you are planning a construction site. What should you consider when choosing temporary lighting supplies?
They must be safe to prevent accidents
They should be colorful
They should be very expensive
They should be very small
Which voltage is recommended for fixed plant such as cranes on construction sites?
400V
230V
110V
SELV
What type of equipment uses 110V on construction sites?
Portable tools and hand lamps
Fixed plant such as cranes
Site offices and flood lighting
Portable lamps in damp places
Which voltage is recommended for site offices and fixed flood lighting?
230V
400V
110V
SELV
SELV is recommended for which type of equipment on construction sites?
Portable lamps used in damp and confined places
Fixed plant such as cranes
Site offices and flood lighting
Portable tools and hand lamps
Imagine you are setting up a construction site in a damp and confined area. Which voltage should you use for the lamps to keep everyone safe?
SELV
400V
230V
110V
What colour is used to identify a 25V socket outlet?
Violet
Yellow
Blue
Red
Which voltage is identified by a yellow socket outlet?
110V
25V
230V
400V
If you see a socket outlet coloured blue, what voltage does it represent?
230V
50V
400V
110V
A red socket outlet is used for which voltage?
400V
25V
110V
50V
Imagine you need to connect a tool to a 50V supply. Which colour socket outlet should you look for?
White
Blue
Red
Yellow
You are planning a project and need to use a 110V power supply. What colour should the socket outlet be to ensure you use the correct voltage?
Yellow
Violet
Blue
Red
What is one way to reduce the risk of electric shock?
Using a reduced low voltage system
Using a high voltage system
Not using any electrical equipment
Using only Class III systems
Why is using a reduced low voltage system safer than using mains-operated (230 V) equipment?
Because it has a lower potential shock voltage
Because it is a Class III system
Because it uses more electricity
Because it is more expensive
If the secondary winding is centre-tapped and connected to earth, what is the shock voltage if you touch either pole and earth?
55V
230V
110V
12V
Select the correct statement about the diagram.
This diagram shows how a reduced low voltage system works.
This diagram shows a water supply system.
This diagram shows a battery circuit.
This diagram shows a solar panel connection.
What is the main purpose of a step-down transformer in low voltage electrical supplies?
To increase the voltage
To decrease the voltage
To keep the voltage the same
To turn off the electricity
What is connected to earth in the secondary winding of the transformer?
The end point
The centre point
The top point
The side point
If you touch either pole and earth in this system, what voltage shock might you receive?
230V
110V
55V
10V
Why is a centre-tapped and earthed secondary winding considered safer?
It gives a higher voltage shock
It gives a lower voltage shock that will not cause harm in most cases
It turns off the electricity
It makes the transformer smaller
Imagine you are planning to use a step-down transformer for a tool. What should you check to make sure it is safe?
That the secondary winding is centre-tapped and connected to earth
That the transformer is very old
That the transformer is painted blue
That the transformer is very heavy
