WorksheetsCENTRAL HEATING MOCK EXAM
Total questions: 40
Worksheet time: 22mins
In a two pipe system the
flow and return pipework are separated
flow and return pipework are mixed
return water is at the same temperature as the flow water
return water temperature is higher than the flow water.
Which of the following systems does the statement apply to? ‘The temperature of the last radiator on the circuit will be cooler than the first radiator.’
Two pipe system.
One pipe system.
Two pipe reverse return system.
Microbore system.
What is the normal size of an open vent pipe to a fully pumped heating system, in a domestic property?
10 mm.
15 mm.
22 mm.
28 mm.
The connection of an open vent pipe and a cold feed pipe, can be made to a fully pumped system using
an automatic air vent
an injector tee
an air separator
a diverter valve.
A zone valve/two port valve in a pumped heating circuit is designed to
isolate the circuit when the desired temperature is reached
permit the system to be heated to temperatures above 100°C
stop the pump vibrating on its fixing mountings
prevent water from the flow and return pipes mixing.
The main purpose of the vent pipe installed on a heating circuit is to
fill the system with water
provide hot water to the feed and expansion cistern
introduce air into the system
protect the system in the event of over-heating.
Refer to Figure 1. Which one of the following components is indicated by the British Standard symbol shown?
Air Inlet Valve.
Draining Valve.
Double Check Valve
Pressure Relief Valve.
Refer to Figure 2. Which one of the following components is indicated by the British Standard symbol shown?
Drain off valve.
Air Inlet Valve.
Servicing Valve.
Pressure Relief Valve.
A three port mid position diverter valve...
provides priority circulation to the hot water circuit
provides priority circulation to the heating circuit
feeds both the hot water and heating circuits simultaneously
is used to discharge water from the system if it overheats.
Which one of the following can be fitted with a remote sensor?
Diverter valve.
Solenoid valve.
Motorised valve.
Thermostatic radiator valve.
Which one of the following components would be strapped to a hot water storage cylinder?
Programmer.
Motorised valve.
Automatic air release.
Thermostat.
The minimum size of primary cold feed pipe for a hot water heating system is
15 mm
22 mm
28 mm
32 mm
Before filling a central heating system for the first time, it is advisable to
remove all radiators and replace each with a piece of temporary piping
turn the pump on to assist with the filling process
ensure that all radiator valves are left in the closed position
remove the pump (accelerator) and replace with a piece of temporary piping.
Which one of the following assists in the removal of flux from heating systems pipework?
Hot flushing a system as part of the commissioning process.
Adding soap solution to the system after testing.
Setting the working system temperature above 60ºC.
Installing all pipes with a fall away from the drain valves.
Combination boilers are designed to
provide domestic hot water and hot water heating
work with two different fuels at the same time
provide hot water from a storage cylinder and hot water heating
provide hot water heating only, through any type of heat emitter.
When fully draining down a heating system
all the air vents should be closed
the open vent pipe should be capped
the air vents should be opened
the radiator valves should be closed.
A dwelling installed with steel panel radiators controlled by thermostatic valves is being decorated. The radiators will be removed one at a time as the heating is to be kept on during the work. Which one of the following precautions should be taken before removing the radiators?
Remove the head on the thermostatic radiator valve and secure the pressure pin with a decorators cap.
Set the thermostatic radiator valve to the lowest setting.
Set the thermostatic radiator valve to its highest setting.
Open the air release on the radiator, remove the thermostatic valve and block its inlet port temporarily.
The downstairs radiators in a heating system are failing to warm up, whilst the upstairs radiators and the hot water system are only lukewarm. This is most likely to be caused by a faulty
boiler gas valve
pump
heating zone valve
room thermostat.
The safety risk to customers when carrying out rectification work on central heating systems can be minimised by ensuring that
all appropriate temporary earth continuity bonding has been applied
the system is always fully drained for every maintenance activity
all plastic pipework has been correctly bonded to the incoming supply
all thermostatic radiator valves are at their lowest setting.
During maintenance procedures, in addition to turning off the electrical supply to any electrically operated components at the consumer unit, which one of the following safety actions should be taken as part of the safe isolation procedure?
Place a notice on the consumer unit advising that it should not be used.
Ask the customer to turn off the supply and explain that it is their responsibility.
Turn off the cold water supply to the heating appliance to undertake the work.
Lock off the MCB and provide a warning notice on the consumer unit.
The main objective of installing a central heating system in a property is
Thermal comfort
To allow customer control of timings
To conserve fuel
To fully heat a property up to 180C.
What is this component called
Central heating booster pump
Central heating circulation pump
Central heating control valve
Shower booster pump
What is the purpose of a pressure relief valve in a sealed heating system?
To discharge pressure to a safe location if required
To isolate the flow of water
To prevent lock out and prolong circulator life
To control the flow of water to the hot water cylinder
What building regulation covers central heating systems?
Part G
Part L
Part A
Part H
When positioning a single room thermostat, it’s recommended height from ground level is
1m
1.5m
2m
2.5m
What is the image shown used for?
Clearing the pump
Venting the boiler interlock
Charging the radiators
Bleeding the radiators
What does this component do?
controls the hot water temperature
controls the room temperature
controls the boiler
none of the above
What kind of boiler can you see here?
system boiler
conventional boiler
combination boiler
thermal store
How high should the open vent pipe on a central heating system extend?
150mm above the water line
250mm above the water line
350mm above the water line
450mm above the water line
What is the name of this heating system
Y Plan
S Plan
C Plan
A Plan
This image shows a?
A Auto air vent
A Radiator valve
A drain off
A circulator
What type of system is shown here?
Two pipe semi gravity with heat sink
C plan plus two pipe semi gravity
One pipe gravity system
Oil fueled semi gravity two pipe system
What is the title of the diagram shown in the image?
Two-pipe semi-gravity
Single-pipe gravity
Three-pipe semi-gravity
Two-pipe with Heat Sink
What system is this?
Fully Pumped Y-Plan
Fully Pumped S-Plan
Fully Pumped with Heat sink
Two Pipe Semi Gravity
For an open-vented system with a head pressure of 8m, what would be the test pressure?
4 bar
8 bar
2 bar
1.2 bar
What is the normal capacity of this component?
4 Litres
10 Litres
18 Litres
24 Litres
What is Delta T
Weight of the cistern
The pump speed
Room temperature divided by boiler temperature
The difference between the temperature of the radiator and the room
What is this type of panel radiator?
Single Panel
Double Panel, Single Convector Fins
Single Panel, Single Convector fins
Double Panel, Double Convector fins
What is this type of panel radiator?
Single Panel
Double Panel, Single Convector Fins
Single Panel, Single Convector fins
Double Panel, Double Convector fins
What is the primary purpose of lock-shield valves in a radiator system?
To allow the customer to adjust the temperature
To balance the system by the plumber/engineer
To increase water pressure
To decorate the radiator
