Worksheets9189PH3ELECTPPT6
Total questions: 39
Worksheet time: 20mins
Who must carry out any electrical work due to the inherent danger it poses?
Any individual
Only competent operatives
Only homeowners
Any plumber
What are the restricted areas for electrical equipment installation known as?
Circuits
Zones
Sections
Regions
According to BS 7671 18th edition, which zone is the space under the bath if it is accessible without the use of a tool?
Zone 0
Zone 1
Zone 2
Outside the zones
What should be followed regarding the use of individual equipment within the specified zones?
Local government regulations
Manufacturers' instructions
Personal judgment
General guidelines
Where should a boiler be installed in a bathroom according to general rules?
Inside zones 0, 1, and 2
Outside zones 0, 1, and 2
Directly above the bath
Next to the basin
Where should the fused spur feeding a boiler be located if the boiler is installed in a bathroom?
Inside the bathroom
Outside the bathroom
Under the bath
Next to the shower
What is a requirement for the placement of electrical equipment in a bathroom to ensure safety?
It can be touched while using the bath or basin
It should be in direct contact with water
It cannot be touched while also touching water within the bath, shower, basin, or any other water source
It should be installed without a protective cover
How should electrical equipment ideally be protected in a bathroom?
By placing it in an open shelf
By placing it in a closable cupboard
By covering it with a waterproof cloth
By installing it near a heat source
What additional protection should all equipment installed in a bathroom have?
An RCCB
An RCD
A fuse
A circuit breaker
Where can showers be fitted according to the manufacturer's instructions?
Only outside zones 1 and 2
Within zones 1 and 2
Only in zone 1
Anywhere in the bathroom without restrictions
What must showers be protected by?
A waterproof cover
An RCD
A dedicated water supply
An isolator switch
Where must the isolator for a Jacuzzi bath pump be positioned?
Inside the bathroom
Under the bath
Outside the bathroom
Within zone 2
Extractor fans suitable for zone 1 must be checked for what?
Energy efficiency
Noise levels
Suitability and protection by an RCD
Color and design
What is the purpose of a programmer in individual heating and hot water circuits within a dwelling?
To cut off the power supply
To control individual heating and hot water circuits
To monitor the temperature of the water
To provide insulation to the heating systems
What is the function of the double pole switch?
To isolate live and neutral
To disconnect the power supply
To control the temperature settings
To act as a fuse for the heating system
What type of valve can be operated by a room thermostat within a heating system?
A one-port valve
A two- or three-port valve
A pressure relief valve
A butterfly valve
In what type of plan systems can a room thermostat operate a valve?
A- and B-plan systems
S- and T-plan systems
S- or Y-plan systems
X- and Z-plan systems
How do wireless room thermostats operate?
By using a wired connection to the sensor
By using thermistors and an RF signal between the sensor and the remote receiver
By using Bluetooth technology only
By using infrared signals
What is the main advantage of using wireless room thermostats mentioned in the text?
They are more accurate than wired thermostats
They can be controlled via a smartphone
They remove the need for unsightly cables
They use less energy
What is positioned at the back of a cylinder thermostat against the surface of a cylinder?
A calibrated bimetallic strip
A micro-switch
A set point adjustment screw
A fixed point
What happens when the cylinder thermostat senses the pre-set temperature?
It increases the electrical supply to the DHW zone valve.
It turns off the electrical supply to the DHW zone valve.
It breaks the bimetallic strip.
It activates the micro-switch.
What is the function of the set point adjustment screw in a cylinder thermostat?
To fix the thermostat to the cylinder
To adjust the sensitivity of the micro-switch
To calibrate the bimetallic strip
To set the temperature at which the thermostat will turn off the electrical supply
What is provided with an immersion heater for temperature control according to the learning material?
A single-tier temperature control
A two-tier temperature control
A manually adjustable temperature control only
A digital temperature control
What is the size of the typical Honeywell two-port zone valve shown in the learning material?
15mm
22mm
30mm
25mm
What happens when the Honeywell two-port zone valve fully opens?
The microswitch is disconnected.
The valve closes automatically.
The microswitch closes to turn on appliances as necessary.
The motor stops operating.
What is one of the functions of a thermistor in a combination boiler or multipoint water heater?
It generates heat to warm the water.
It measures water flow rate.
It accurately measures temperature and helps to control the operation.
It provides electrical insulation.
How does an appliance use the thermistor to regulate temperature?
By reading the resistance of the thermistor and adjusting the water pressure.
By reading the resistance of the thermistor and adjusting the temperature accordingly.
By using the thermistor to increase the electrical current.
By using the thermistor to decrease the water flow.
What is the first step in the basic sequence of operation for a gas fired, fanned-flue boiler according to the diagram?
Boiler thermostat calling for heat
Fan operates
Signal to boiler control panel from zone valve
Pressure switch senses pressure change
What happens immediately after the pressure switch senses a pressure change in the sequence of operation for a gas fired, fanned-flue boiler?
Gas valve solenoid opens
Ignition process begins via control panel
Main burner ignites
Boiler thermostat calling for heat
What is the final step in the basic sequence of operation for a gas fired, fanned-flue boiler as shown in the diagram?
Flame verified
Gas valve solenoid opens
Main burner ignites
Fan operates
What is the purpose of flame rectification in boiler designs?
To cool down the boiler
To rectify electrical faults in the boiler
To supervise the flame as a safety measure
To increase the efficiency of fuel combustion
How does flame rectification work?
By using water as a conductor to generate electricity
By utilising a flame as a conductor and passing a current through it
By converting chemical energy directly into electrical energy
By using a mechanical switch to detect the presence of a flame
What happens when there is no flame in the boiler system?
The boiler will continue to operate normally
The ignition sequence is triggered repeatedly
The control box shuts down the system
No ignition sequence can begin
How does the ignition controller verify the presence of the flame at the pilot?
By sending a signal to open the gas valve solenoid.
By calling for heat.
By using flame rectification.
By terminating the signal to the gas valve.
What happens when the room thermostat is satisfied?
The ignition controller sends a spark to the electrode.
The signal to the gas valve is terminated and the flame goes out.
The gas valve solenoid opens.
The ignition controller verifies the presence of the flame.
What is the role of the gas valve solenoid in the boiler system?
It verifies the presence of the flame at the pilot.
It sends a spark to the electrode to ignite the gas.
It opens to allow gas to flow when the ignition controller sends the signal.
It calls for heat when the thermostat is activated.
What is the purpose of an air pressure switch in a boiler system?
To regulate the temperature of the water
To ensure that the fan is operating within the boiler
To control the flow of gas to the burners
To monitor the level of water in the boiler
What type of plan is depicted in the wiring schematics for heating and hot water in the image?
Y-plan
S-plan
W-plan
X-plan
What is the frequency of the power supply shown in the wiring schematics?
60Hz
50Hz
40Hz
70Hz
