WorksheetsT LEVEL ELECTROTECHNICAL SYSTEMS
Total questions: 52
Worksheet time: 34mins
What is the function of a protection device in an electrotechnical circuit?
Which component in an electrotechnical circuit is responsible for controlling the flow of electricity?
Conductor (wire)
Protection device (fuse)
Control device (switch)
Power source (battery)
What is the role of the power source in an electrotechnical circuit?
To protect the circuit
To provide illumination
To supply electrical energy
To control the circuit
What is the component called that provides AC or DC in an electrical circuit?
Circuit protection
Load
Source of supply
Circuit control
What is the purpose of a fuse or circuit breaker in an electrical circuit?
To provide AC or DC
To act as a load
To control the circuit
To provide circuit protection
What is the term for a device that needs current to operate in an electrical circuit?
Circuit control
Load
Source of supply
Circuit protection
What is the function of a switch in an electrical circuit?
To provide circuit protection
To act as a load
To control the circuit
To supply AC or DC
What are conductors embedded in a protective sheathing called?
Load
Circuit control
Cable
Source of supply
What is an electrical power circuit used for?
Distributing power for utilisation elsewhere
Generating electricity
Storing electrical energy
Converting AC to DC
What is the most common type of power circuit in installations?
Radial circuit
Ring final circuit
Parallel circuit
Series circuit
What is a common rule for domestic installations involving ring circuits?
One ring circuit for every 50m² of floor
One ring circuit for every 100m² of floor
One ring circuit for every 200m² of floor
One ring circuit for every 500m² of floor
How does a radial circuit differ from a ring final circuit?
What is the main topic of the diagram shown in the learning material?
Ring final circuit
Series circuit
Parallel circuit
Open circuit
What type of electrical circuit is shown in the diagram?
Radial circuit
Ring circuit
Parallel circuit
Series circuit
What type of cables are usually involved in three-phase power distribution in industry?
What is the voltage requirement for single-phase lighting ?
400V
230V
110V
500V
When the demand is for 400V motors, how are the phases connected to the distribution system?
Only one phase is connected
Two phases are connected
All three phases are directly connected
No phases are connected
What is the purpose of connecting alternate phases to local distribution boards when 230V single-phase voltage is required?
To increase the voltage
To balance the supply
To decrease the voltage
To disconnect the supply
What is the purpose of electrical lighting or illumination?
To heat spaces
To cool spaces
To achieve practical or aesthetic effects
To generate sound
What does the wiring diagram in the document represent?
A heating circuit
A cooling circuit
A lighting circuit
A sound circuit
What is a characteristic of a series circuit?
The current is the same at all points of the circuit.
The voltage is the same across all components.
The resistance is zero.
The circuit can only have one component.
In a parallel circuit, how does the current flow from the supply?
Only to one path
Equally divided among all paths
It has a choice of where to go
It flows back to the supply
If the current measured at ammeter 1 is added to the current at ammeter 2, what does it equal?
Half the total current
Double the total current
The total current coming out of the supply
Zero
What is the purpose of introducing a switch in the line side of a lighting circuit?
To increase the voltage
To control the lighting by breaking or making the circuit
To reduce the current
To change the frequency
What is two-way switching used for?
Controlling one light with two switches
Controlling multiple lights with one switch
Controlling one light with three switches
Controlling multiple lights with multiple switches
What type of switching is used when three switches are required?
Two-way switching
Intermediate switching
Single-way switching
Double switching
How many terminals does the switch used in intermediate switching have?
Two terminals
Three terminals
Four terminals
Five terminals
What type of lamps are commonly used for street lighting due to their efficiency and ability to penetrate mist and fog?
Incandescent lamps
Sodium vapour lamps
Fluorescent lamps
Halogen lamps
At what wavelength do sodium vapour lamps emit light?
450 nanometres
589 nanometres
620 nanometres
700 nanometres
What type of lighting is replacing sodium vapour lamps?
Incandescent lighting
Halogen lighting
LED lighting
Fluorescent lighting
Why are fluorescent tube lights being replaced by LED luminaires?
Fluorescent tubes are cheaper to run.
LED luminaires generate more heat.
Fluorescent tubes are expensive to run and generate unwanted heat.
LED luminaires cause photosensitive epilepsy.
What health issue can be caused by the flicker effects of fluorescent tube lighting?
Photosensitive epilepsy
Asthma
Diabetes
Hypertension
What type of circuit breaker is used to protect circuits with large banks of fluorescent lights?
Type A breaker
Type B breaker
Type C breaker
Type D breaker
Why are fluorescent lights classified as hazardous waste?
They contain high pressure mercury and phosphorus.
They contain low pressure mercury and phosphorus.
They are made of plastic.
They emit harmful radiation.
Why are LED luminaires increasingly replacing filament lamps and tubes?
They are cheaper to produce.
They have a higher efficiency and reduced heat emission.
They are more colorful.
They are easier to install.
What is the typical wattage replacement for a 100 watt filament lamp with an LED?
10W
50W
5W
20W
What is the typical lifetime of LED lamps compared to filament lamps?
1,000 hours for LEDs and 100 hours for filaments
10,000 hours for LEDs and 200–300 hours for filaments
5,000 hours for LEDs and 500 hours for filaments
20,000 hours for LEDs and 1,000 hours for filaments
What is the primary operating principle of LED lights?
Electroluminance
Incandescence
Fluorescence
Phosphorescence
What is the typical wattage rating for inset downlights?
5W or 8W
10W or 12W
15W or 20W
25W or 30W
What feature do modern LED downlights have for safety?
Firestop rated
Water resistant
Shockproof
UV protected
Which of the following is NOT an advantage of LED lighting?
Long life
Phantom effect
Continuous illumination if one fails
Better overall illumination
What is the main advantage of halogen lights in terms of their construction?
They are more energy-efficient than LED lights.
They incorporate a regeneration effect to maintain the tungsten filament.
They are cheaper to produce than LED lights.
They provide a wider range of colors than LED lights.
What type of sensor is typically used to trigger security lighting?
Ultrasonic sensor
PIR (passive infra-red) sensor
Microwave sensor
Pressure sensor
Why are halogen lights being replaced by LED alternatives?
Halogen lights are more expensive.
LED lights are more energy-efficient.
Halogen lights are brighter.
LED lights have a shorter lifespan.
What is a data network designed to do?
Transfer data from one network access point to another
Store data securely
Encrypt data for security
Analyze data for patterns
What creates a network?
Connecting more than one device together
Using a single computer
Installing antivirus software
Backing up data regularly
What is an example of a small network?
A collection of computers within a school
A single smartphone
A standalone printer
A personal digital assistant
How do data networks impact modern communication?
They are essential for telecommunications and the internet
They slow down communication processes
They are only used for local file sharing
They are irrelevant to modern communication
What does LAN stand for in networking?
Local Area Network
Large Area Network
Limited Access Network
Linked Area Network
Which of the following is a characteristic of a LAN?
It connects computers within the same building.
It connects multiple cities.
It requires broadband cables.
It is always connected to the internet.
What does WAN stand for in networking?
Wide Area Network
Wireless Area Network
Wired Access Network
World Area Network
Which of the following is true about a WAN?
It connects multiple LANs.
It is limited to a single building.
It does not require any cables.
It is always wireless.
