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WorksheetsLevel 2 - Central Heating MEGA QUIZ
Total questions: 62
Worksheet time: 34mins
Which document gives advice on how to satisfy the requirements of L1a and L1b regarding the design efficiency of domestic CH systems?
BS EN 442
BS EN 12828
Manufacturers’ instructions
Domestic Heating Compliance Guide (DHCG)
What is the main purpose of central heating?
To provide cooling in every room
To provide lighting in every room
To provide ventilation in every room
To provide thermal comfort within a property
When the outside temperature is −1⁰C, what type of central heating allows all rooms in a property to be heated at the same time to a specific temperature set by the customer?
Full central heating
Background central heating
Pumped heating with gravity hot water
Selective central heating
What type of system is installed mainly on a cost basis and uses a smaller boiler or heat emitters to only take the chill out of the rooms and heat the rooms to a lower temperature?
Sealed, pressurised systems
Pumped heating with gravity hot water
Background central heating
Fully pumped system
What has central heating been replaced with over the past 10 years?
Open fire in each room
Gravity hot water system
heat pumps
Electric storage heaters
What type of modern domestic central heating system is fed from a feed-and-expansion cistern located at high level?
Sealed, pressurised systems
Low-pressure, open-vented systems
Fully pumped system
Pumped heating with gravity hot water
What type of modern domestic central heating system is fed directly from the mains cold water and incorporates an expansion vessel to take up the expansion of the heated water?
Low-pressure, open-vented systems
Sealed, pressurised systems
Fully pumped system
Pumped heating with gravity hot water
What is the advantage of a C plan two-pipe semi-gravity central heating system?
Not compliant with Building Regulations L1b
Limited control on heating and hot water
Lower efficiency
Quicker heat-up time and compliant to building regulations L1B
What is the purpose of a heat sink in a two-pipe semi-gravity central heating system?
To increase the efficiency of the boiler
To regulate the air pressure in the system
To control the flow and return temperature
To dissipate heat without overheating the boiler
What type of system uses a pump to circulate heated water around the hot water and heating circuits?
C plan two-pipe semi-gravity
Two-pipe semi-gravity with heat sink
Pumped central heating only
Fully pumped systems
What is the purpose of an automatic bypass valve in a fully pumped mid-position valve system?
To prevent lock out and prolong circulator life
To control the flow of water to the hot water cylinder
To increase the system pressure when circuits close down
To isolate the flow of water
Which type of system uses one zone valve to control the hot water and a second zone valve to control the heating circuit?
Fully pumped two two-port valves – S plan system
Fully pumped mid-position valve – Y plan system
Pumped central heating only
Two-pipe semi-gravity with heat sink
What is the purpose of locking out in a boiler?
To increase the efficiency of the boiler
To regulate the air pressure in the system
To protect the boiler from overheating
To control the flow and return temperature
What is the cause of corrosion within a central heating system?
Aeration
Overheating
Low system pressure
Excessive water flow
What is the purpose of a sealed expansion vessel in a sealed heating system?
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
To accommodate the increase in volume as the water heats up
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 is this component called
Central heating booster pump
Central heating circulation pump
Central heating control valve
Shower booster pump
What building regulation covers central heating systems?
Part G
Part L
Part A
Part H
The main problem with the one pipe system is that
They are prone to blockages
They can't be used in a bungalow
They are expensive to run
The earlier radiators pass cooler water back into the circuit
When positioning a single room thermostat, it’s recommended height from ground level is
1m
1.5m
2m
2.5m
When setting the water level in a feed and expansion cistern, the allowance that should be
made for the expansion of water in the heating system is
4 %
6 %
10 %
1600 times its volume
The recommended test pressure for a hydraulic test on a central heating system is
normal working pressure
1.5 times normal working pressure
twice the normal working pressure
3 bar pressure
What is the image shown used for?
Clearing the pump
Venting the boiler interlock
Charging the radiators
Bleeding the radiators
What is this
TRV
Bypass valve
Thermostatic mixing valve
High temperature relief valve
What does this component do?
controls the hot water temperature
controls the room temperature
controls the boiler
none of the above
What type of system is this?
C plan
Y plan
S plan plus
S plan
Name the component
programmer
cylinder thermostat
boiler thermostat
room thermostat
name the component
wheel head radiator valve
thermostatic radiator valve
lock shield radiator valve
gate valve
What type if radiator can you see?
single panel
double panel
double panel single convector
column radiator
What is this component used for?
connecting to taps
connecting cold water to a central heating system to fill
connecting to an expansion vessel
back flow prevention device
What kind of boiler can you see here?
system boiler
conventional boiler
combination boiler
thermal store
A property above how many m2 should have more than 1 zone?
100 m2
150 m2
200 m2
250 m2
A heating system not open to the atmosphere is know as a?
Un vented system
Mains feed system
Sealed system
Fully pumped system
Match the following
A
System under negative pressure
B
System under positive pressure
C
Correct arrangement
What type if radiator can you see?
single panel
double panel
double panel single convector
column radiator
A drawback to a one pipe system is?
It is expensive to install
The radiators get too hot
The return water travels to the following radiator
It needs 2 F&E cisterns
Match the following Heat exchangers to the correct boiler description
Regular Boiler
(BBU)
Regular Boiler (System)
Instantaneous (Combi Boiler)
Storage (Combination Boiler)
What is the purpose of a Thermostatic valve on a radiator
To control the temperature of the water in the radiator
To turn off the radiator when the air temperature in the room is at the required level according to the setting on the valve head
To turn off the radiator when the air temperature in the room is at the required level according to the room thermostat
To turn on the radiator when the air temperature in the room is at the required level according to the setting on the valve head
What is the name of this heating component
Feeling loop
Pressure loop
Hula hoop
Filling loop
What is the name of this type of heating system
Two pie
Reversed return
One pipe
Secondary circulation
What does a Magnaclean do
Removes limescale in a boiler
Remove iron oxides
Collects iron oxide
Reduces magnetic fields in a system
What one of these components is NOT installed on a sealed heating system
Which of the following types of heat emitters potentially has blocked fins due to dust build-up?
Skirting convector
Fan convector
Kickspace heater
LST radiators
Which of the following is not a variation of connections for the radiator valves?
TBOE
BBOE
TBSE
TTOE
The diagram shown can be identified as:
Insulation plan
Floor layout
Underfloor heating system
Trace heating system
One radiator in the circuit must be left without a TRV fitted. Building Regulations state it should be the:
Bathroom radiator
Hallway radiator
Front room radiator
Kitchen radiator
What is the cause of corrosion within a central heating system?
Aeration
Overheating
Low system pressure
Excessive water flow
Which one of the following would be included in a sealed central heating system?
Expansion Vessel
F& E System
Pressure reducing valve
Cold Water Storage Cistern
when balancing a central heating system, what is the design temperature drop between flow and return pipework?
20°c
15°c
4°c
4.2°c
When setting the water volume in an F and E cistern, what allowance should be made for expansion of water?
2.5%
4%
10%
12%
What is the disadvantage of a two-pipe semi-gravity system in terms of heat control?
Uncontrolled heat
Controlled heat
Heat is not distributed evenly
Heat emitters do not reach the same temperature
What is the advantage of a two-pipe semi-gravity system in terms of heat emitters?
Heat emitters are not efficient
All heat emitters reach the same temperature
All heat emitters have different temperatures
Heat emitters are not affected by the system
What is the recommended minimum height for the open vent pipe in a one-pipe semi-gravity system?
350mm
450mm
250mm
150mm
What is the primary function of the open vent pipe in a one-pipe semi-gravity system?
To discharge steam/water in a fault condition
To allow filling of the system from the F&E cistern
To control room temperature
allow for expansion and contraction to provide a safety outlet in case of overheating
What is the drawback of a one-pipe semi-gravity system in terms of the temperature of each radiator?
The temperature of the radiators is unpredictable
Each radiator is progressively hotter than the previous
Each radiator is progressively cooler than the previous
All radiators have the same temperature
Which radiator is a double panel double convector
Balancing a heating system requires you to adjust what
The thermostat
The TRV
The lock shield
The thermometer
Where is the neutral point
At the edge of the Klingon empire
Where the open vent connects to the circuit
Where the primary flow becomes the return
Where the cold feed connects to the circuit
The main problem with the one pipe system is that
They are prone to blockages
They can't be used in a bungalow
They are expensive to run
The earlier radiators pass cooler water back into the circuit
The cold water supply to a fully pumped open vented central heating system should be
isolated at the
stop valve to the incoming cold water supply pipework
Gate valve on the cold feed pipework from the F & E cistern
service valve to the float operated valve to the CWS cistern
service valve to the float operated valve to the F & E cistern.
When setting the water level in a feed and expansion cistern, the allowance that should be
made for the expansion of water in the heating system is
4 %
6 %
10 %
1600 times its volume
Gas Boilers should be installed by someone registered with
Gas Safe
HETAS
OFTEC
Ofsted
