L3 Central Heating Revision

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Frage 1 von 73

According to the Domestic Heating Compliance Guide, a device that takes heat energy from a low-temperature source and upgrades it to a temperature that could be used for heating, is known as a:

Wähle eine der folgenden:

a) heat pump
b) solar heating panel
c) combined heat and power boiler
d) condensing boiler

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Frage 2 von 73

Which one of the following is used to indicate the U value through a building fabric?

Wähle eine der folgenden:

a) W/m² ºC.
b) W/m³ ºC.
c) W x r ºC.
d) W + r ºC.

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Frage 3 von 73

Which one of the following Building Regulations covers the requirements for combustion appliances?

Wähle eine der folgenden:

a) Part A (C in Northern Ireland).
b) Part J (N in Northern Ireland).
c) Part L (K in Northern Ireland).
d) Part P (P in Northern Ireland).

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Frage 4 von 73

Which one of the following government departments provides information on the Boiler Efficiency Database?

Wähle eine der folgenden:

a) DfES. (Department for Education and Skills ..(DfES)
b) DEFRA. (Department for Environment, Food and Rural Affairs (Defra)
c) BERR. (Department for Business, Enterprise and Regulatory Reform)
d) DIUS. (Department for Innovation, Universities and Skills)

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Frage 5 von 73

A central heating system in which the water supplied to the system is fed directly from the cold water supply pipe is

Wähle eine der folgenden:

a) open vented fully pumped
b) open vented gravity
c) unvented hot water
d) sealed system

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Frage 6 von 73

According to the Domestic Heating Compliance Guide, what is the minimum SEDBUK value for a gas or oil fired central heating boiler installed in an existing dwelling after 1 April 2007?

Wähle eine der folgenden:

a) 76%.
b) 80%.
c) 82%.
d) 86%.

Erklärung

Frage 7 von 73

Which one of the following methods is usually preferred for determining the boiler output when replacing an existing oil or gas fired boiler?

Wähle eine der folgenden:

a) Replace like for like.
b) Whole house boiler sizing method.
c) Add 30% to existing output.
d) Only use SEDBUK band D boilers.

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Frage 8 von 73

According to the Domestic Heating Compliance Guide, which one of the following organisations operates an approvals scheme for solid fuel boilers and heating appliances?

Wähle eine der folgenden:

a) CORGI.
b) OFTEC.
c) HETAS.
d) NICEIC.

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Frage 9 von 73

Which one of the following should be the minimum distance, in mm, between a boiler flue and any combustible material when it passes through a cupboard?

Wähle eine der folgenden:

a) 10.
b) 15.
c) 25.
d) 50.

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Frage 10 von 73

Which one of the following would be the most desirable pump location in an open vented fully pumped central heating system?

Wähle eine der folgenden:

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Frage 11 von 73

Which one of the following is the name of the point at which an expansion vessel connects to a central heating system?

Wähle eine der folgenden:

a) Negative point.
b) Neutral point.
c) Positive point.
d) Central point.

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Frage 12 von 73

The condensate pipework from a high efficiency (condensing) boiler should be laid at a minimum fall of

Wähle eine der folgenden:

a) 1.5º
b) 2.5º
c) 5º
d) 10º

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Frage 13 von 73

Which one of the following test methods is used to determine the soundness of a central heating system?

Wähle eine der folgenden:

a) Hydraulic pressure.
b) Visual inspection.
c) Hydrostatic pressure.
d) Pneumatic pressure.

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Frage 14 von 73

Which one of the following types of central heating system is shown in the Figure?

Wähle eine der folgenden:

a) Fully pumped system with 2 x two port valves.
b) Fully pumped system with mid-position valve.
c) Pumped heating with unvented hot water.
d) Sealed central heating system.

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Frage 15 von 73

Which one of the following types of central heating system is shown in the Figure?

Wähle eine der folgenden:

a) Pumped heating with unvented hot water.
b) Fully pumped system with 2 x two port valves.
c) Sealed central heating system.
d) Fully pumped system with 3 ports valve.

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Frage 16 von 73

Which one of the following types of central heating system is shown in the Figure?

Wähle eine der folgenden:

a) Fully pumped system with 2 x two port valves.
b) Fully pumped system with mid-position valve.
c) Pumped heating with unvented hot water.
d) Sealed central heating system.

Erklärung

Frage 17 von 73

Which one of the following is the likely effect on the heating system when the pump is positioned as shown in the Figure?

Wähle eine der folgenden:

a) The system is put under neutral pressure.
b) The system is put under positive pressure.
c) Water is likely to be pumped over the vent.
d) Air would be sucked in through the vent.

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Frage 18 von 73

Which one of the following is the likely effect on the heating system when the pump is positioned as shown in the Figure?

Wähle eine der folgenden:

a) The system is put under neutral pressure.
b) The system is put under positive pressure.
c) Water is likely to be pumped over the vent.
d) Air would be sucked in through the vent.

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Frage 19 von 73

In the central heating system shown in the Figure , what is the name of Component A

Wähle eine der folgenden:

a) Zone valve.
b) 3 port mid position valve.
c) Pressure relief valve.
d) Automatic air vent.

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Frage 20 von 73

The minimum size of earthling cable, in mm, used to bond the main services in a domestic property is

Wähle eine der folgenden:

a) 2.5 mm2
b) 6 mm2
c) 10mm2
d) 12 mm2

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Frage 21 von 73

Which one of the following items of equipment could be used to test temperature differential between the heating flow and return pipework?

Wähle eine der folgenden:

a) Multi-meter
b) Manometer.
c) Ammeter.
d) Digital thermometer.

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Frage 22 von 73

The pressure gauge in a sealed heating system should be capable of reading a pressure range, in bars, of

Wähle eine der folgenden:

a) 0 to 3
b) 0 to 4
c) 1 to 4
d) 2 to 5.

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Frage 23 von 73

When commissioning a gas fired combination boiler, which one of the following activities should be carried out after turning on the mains water supply?

Wähle eine der folgenden:

a) Check the water level is correct in the CWSC.
b) Purge the hot water pipework of air.
c) Check the water level is correct in the F&E cistern.
d) Isolate the boiler at the fused spur outlet.

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Frage 24 von 73

Information related to the performance specification of an LPG fired central heating boiler is obtained from

Wähle eine der folgenden:

a) SEDBUK
b) Building Regulations Part L (F in Northern Ireland)
c) Manufacturer’s instructions
d) CORGI.

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Frage 25 von 73

When commissioning a gas fired system boiler, adjustment to the heat output of the boiler is achieved by

Wähle eine der folgenden:

a) adjusting the room thermostat
b) adjusting the cylinder thermostat
c) range rating the boiler
d) balancing the system.

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Frage 26 von 73

Which one of the following would be the first action prior to de-commissioning a central heating system in an unoccupied dwelling?

Wähle eine der folgenden:

a) Seek permission to carry out the work from the Local Authority.
b) Contact the utility services to isolate the gas and electricity supplies to the building.
c) Ensure that the content of the heating system is drained into containers and disposed of.
d) Ensure that all the incoming services have been safely isolated.

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Frage 27 von 73

Which one of the following would contain a fault finding chart for a specific solid fuel boiler?

Wähle eine der folgenden:

a) HETAS manual.
b) Domestic Heating Compliance Guide.
c) OFTEC manual.
d) Manufacturer’s instructions.

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Frage 28 von 73

When determining the output of a gas central heating boiler, how many kW should be allowed for the hot water heating circuit with a cylinder of 100 – 120 litres?

Wähle eine der folgenden:

a) 2 kW.
b) 4 kW.
c) 6 kW.
d) 8 kW.

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Frage 29 von 73

Which one of the following should be included on a Benchmark Service Interval Record?

Wähle eine der folgenden:

a) Flow and return temperature.
b) Gas inlet pressure.
c) Gas Safe Register ID card serial number.
d) Gas flue analysis results.

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Frage 30 von 73

The Domestic Heating Compliance Guide refers to ‘boiler interlock’. This can be described as a

Wähle eine der folgenden:

a) wiring arrangement preventing the boiler from firing when each circuit has shut off
b) security setting on the boiler to prevent the possibility of tampering by the customer
c) wiring arrangement to remove the residual heat from the boiler to the heat leak radiator
d) system of isolating the boiler when the frost thermostat is activated.

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Frage 31 von 73

According to the Domestic Heating Compliance Guide, a heating system that supplies heat to a number of dwellings from a common heat source is known as

Wähle eine der folgenden:

a) combination heating
b) community heating
c) central heating
d) combined heat and power.

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Frage 32 von 73

On boilers fitted with digital displays, which one of the following display codes takes priority over other codes?

Wähle eine der folgenden:

a) Status.
b) Diagnostic.
c) Fault.
d) Memory.

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Frage 33 von 73

Which one of the following government departments provides information on the Boiler Efficiency Database?

Wähle eine der folgenden:

a) DfES.
b) DEFRA.
c) BERR.
d) DIUS.

Erklärung

Frage 34 von 73

Guidance on how to satisfy the Building Regulations energy efficiency requirements when carrying out central heating work on new buildings can be found in

Wähle eine der folgenden:

a) Approved Document E (B in Northern Ireland)
b) Approved Document G (C in Northern Ireland)
c) Approved Document J (E in Northern Ireland)
d) Approved Document L1A (F1 in Northern Ireland).

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Frage 35 von 73

When installing a high efficiency (condensing boiler), provision must be made for a

Wähle eine der folgenden:

a) discharge pipe run to a drain or soakaway
b) double check valve to be installed on the primary flow
c) single check valve to be installed on the vent pipe
d) flow meter to be installed on the gas valve.

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Frage 36 von 73

Which one of the following is the name of Component A shown in the Figure?

Wähle eine der folgenden:

a) Automatic by-pass valve.
b) Wheel head valve.
c) 2 port motorised valve.
d) Air separator.

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Frage 37 von 73

Which one of the following is the normal pressure for soundness testing a wet central heating system?

Wähle eine der folgenden:

a) 0.5 times the maximum operating pressure.
b) 1.5 times the maximum operating pressure.
c) 2 times the maximum operating head.
d) 2.5 times the maximum operating head.

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Frage 38 von 73

14 Which one of the following types of central heating system is shown in the Figure?

Wähle eine der folgenden:

a) Fully pumped system with 2 x two port valves.
b) Fully pumped system with mid-position valve.
c) Pumped heating with gravity primary flow and return.
d) Sealed central heating system.

Erklärung

Frage 39 von 73

Which one of the following is the likely effect on the heating system when the pump is positioned as shown in the Figure?

Wähle eine der folgenden:

a) The system is put under negative pressure.
b) The system is put under positive pressure.
c) Water is likely to be pumped over the vent.
d) Air would be sucked in through the vent.

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Frage 40 von 73

Which one of the following is the correct size of fuse, in amps, for protecting a domestic central heating circuit?

Wähle eine der folgenden:

a) 3 amp
b) 5. amp
c) 13. amp
d) 16. amp

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Frage 41 von 73

The pressure relief valve in a sealed heating system should discharge at what pressure?

Wähle eine der folgenden:

a) 1bar
b) 2 bars
c) 3 bars
d) 4 bars

Erklärung

Frage 42 von 73

The meaning of the status codes on the digital display indicator on a central heating boiler can be obtained from

Wähle eine der folgenden:

a) inside the combustion chamber
b) SEDBUK
c) Manufacturer’s instructions
d) SBGI.

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Frage 43 von 73

Information related to the performance specification of a natural gas fired central heating boiler is obtained from

Wähle eine der folgenden:

a) CORGI
b) Building Regulations Part L (F in Northern Ireland)
c) SEDBUK
d) Manufacturer’s instructions.

Erklärung

Frage 44 von 73

When commissioning central heating systems, manufacturers generally recommend that the system is

Wähle eine der folgenden:

a) flushed, run at operating temperature, drained, flushed and re-charged
b) tested at operating temperature for 30 minutes at 0.5 times operating pressure
c) left for a period of 24 hours before being put into service after commissioning
d) tested at 0.5 times normal operating temperature for 15 minutes.

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Frage 45 von 73

Which one of the following system components provides an indication that a sealed central heating system has been installed?

Wähle eine der folgenden:

a) Heat leak radiator.
b) mid position valve.
c) Expansion vessel.
d) Air separator.

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Frage 46 von 73

Which one of the following would contain a fault finding chart for a specific high efficiency gas systems boiler?

Wähle eine der folgenden:

a) British Standard 6700.
b) Domestic Heating Compliance Guide.
c) Manufacturer’s instructions.
d) British Standard 5449.

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Frage 47 von 73

Insufficient water flow rate through the heat exchanger of a boiler is usually the cause of

Wähle eine der folgenden:

a) kettling
b) temperature relief discharge
c) pressure relief discharge
d) boiler overrun.

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Frage 48 von 73

Which one of the following shown in the Figure is a manufacturer’s replacement part for a typical gas fired combination boiler?

Wähle eine der folgenden:

a) Compact thermal module.
b) Fan assembly.
c) Secondary heat exchanger.
d) Burner assembly.

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Frage 49 von 73

Your Diploma in plumbing level 3 is an NVQ qualification

Wähle eins der folgenden:

WAHR
FALSCH

Erklärung

Frage 50 von 73

When completing your plumbing L3 diploma you will be gas qualified engineer

Wähle eins der folgenden:

WAHR
FALSCH

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Frage 51 von 73

The Gas (Installation & Use), Regulation 3, specifies the qualifications required to carry out work in relation to gas fittings and gas storage. Which one of the following describes the minimum level of qualification required?

Wähle eine der folgenden:

A) A fully qualified plumber to NVQ Level 3 standard.
B) A member of a class of person approved by HSE
C) A person regularly attending manufacture appliance training courses
D) A person that has successfully completed an accredited course

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Frage 52 von 73

What type of open vented system is shown in the diagram?

Wähle eine der folgenden:

a) Fully pumped with two mid position valves.
b) Partially pumped heating with gravity hot water.
c) Fully pumped with 2 x two port valves.
d) Partially pumped using a mid position valve.

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Frage 53 von 73

What is the main feature when designing a space heating circuit to a dwelling with a floor area In excess of 150 m²

Wähle eine der folgenden:

a) A single zone with weather compensated control and optimum start.
b) A single zone with optimum start and TRVs on all radiators
c) Multiple zones with separate time and temperature controls
d) Multiple zones with a single time controller and TRVs on each radiator.

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Frage 54 von 73

Which one of the following identifies this process occurs whereby the outside temp of the building is measured in order to adjust the heating start time?

Wähle eine der folgenden:

a) Optimum start.
b) Delayed start.
c ) Thermo start
d) Manual start.

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Frage 55 von 73

Which one of the following types of heating system uses the components In the image shown?

Wähle eine der folgenden:

a) C Plan.
d) W Plan.
c) S Plan.
b) Y Plan,

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Frage 56 von 73

which one of the following statements best describes the function of a Boiler interlock

Wähle eine der folgenden:

a) A bypass arrangement in the primary flow and return to assist the boiler in removing excess hot water.
b) A wiring arrangement that permits the frost stat to override all other controls when the outside temperature rises
c) An arrangement permitting hot water to be obtained without the heating circuit being in operation
d) A wiring arrangement that prevents the boiler firing unless there IS a demand from either the water of space heating

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Frage 57 von 73

Which one of the following Is a correct description of the circuit shown?

Wähle eine der folgenden:

A- Fully pumped hot water and multiple space heating system.
B- Fully pumped incorporating two 2 port valves.
C- Fully pumped incorporating a 3 port valve.
D- Fully pumped heating, gravity hot water.

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Frage 58 von 73

which one of the following heating systems is Indicated by the wiring diagram shown?

Wähle eine der folgenden:

A- Fully pumped hot water and multiple space heating system.
B- Fully pumped incorporating two 2 port valves.
C- Fully pumped incorporating a 3 port valve.
D- Fully pumped heating, gravity hot water.

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Frage 59 von 73

Which one of the following heating systems is indicated by the wiring diagram shown?

Wähle eine der folgenden:

a) S plan plus
b) C plan plus
c) W plan
d) Y plan

Erklärung

Frage 60 von 73

Work is being undertaken on the wiring centre of a central system. Which one of the following actions should be taken in addition to switching off the electrical supply at the fuse spur?

Wähle eine der folgenden:

a) Ask the customer to turn off the supply and explain it is their responsibility.
b) Use a notice which is placed on the consumer unit stating “Do not use”
c) Remove and retain the fuse and check for safe isolation of the supply.
d) Turn off the electrical supply and carry out the work methodically.

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Frage 61 von 73

A ring final circuit requires the addition of a fused connection for a boiler. Which one of the following indicate the most suitable location to conduct safe isolation in order to carry out this work

Wähle eine der folgenden:

a) The consumer Unit main switch.
b) The circuit breaker for the circuit
c) The boiler time clock/controller.
d) At the supplier's main cut out fuse

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Frage 62 von 73

What does the use of low loss headers on multi boiler central heating installations enable?

Wähle eine der folgenden:

A- Smaller capacity F&E cisterns
B- A number of balanced independent pump circuits.
C- filling loop to be of smaller diameter.
D- A reduction in operating pressure in the system.

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Frage 63 von 73

Which one of the following identifies the most important factor when calculating the pipework size for a heating system?

Wähle eine der folgenden:

A- Water density
B- Water velocity.
C- Water hardness
D- Water viscosity.

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Frage 64 von 73

What type of heating component is shown in the image?

Wähle eine der folgenden:

A- a pressure gauge.
B- an automatic air vent
C- an electric thermostat
D- a temperature gauge.

Erklärung

Frage 65 von 73

Both the pressure relief and temperature control valves fail in a sealed heating system. What is the likely outcome in such situation?

Wähle eine der folgenden:

A- The boiler may stop working.
B- The pump may stop working
C- The pressure vessel may explode.
D- The pressure vessel may overflow.

Erklärung

Frage 66 von 73

For safety reason, it is important for pressure relief valves to be installed correctly. At what pressure Is a pressure relief valve on a combination boiler normally set to discharge

Wähle eine der folgenden:

A- 1.5 bar.
B- 2 5 bar.
C- 3 bar.
D- 3.5 bar

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Frage 67 von 73

which one of the following best describes an advantage of using a sealed central heating system?

Wähle eine der folgenden:

A- lt is less expensive to install.
B- lt can serve longer dead legs
C- lt has a manual test devise.
D- lt produces more heat

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Frage 68 von 73

In a sealed central heating system, which one of the following replaces the open vent pipe in a conventional system?

Wähle eine der folgenden:

A- Filling loop.
B- Non-return valve.
C- Pressure relief valve
D- Temperature and pressure gauge.

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Frage 69 von 73

The most appropriate position for an expansion vessel is indicated by which one of the following points in the system?

Wähle eine der folgenden:

A- the highest point.
B- the lowest point.
C- the coolest part of the system.
D- the hottest part of the system.

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Frage 70 von 73

Which type of fuel would not be used in rural areas of the UK where access to a piped fuel supply Is unavailable?

Wähle eine der folgenden:

A- Fuel oil
B- Natural gas.
C- Heat pumps.
D- Solid fuel.

Erklärung

Frage 71 von 73

what type of gas heating boiler component is shown In the Image?

Wähle eine der folgenden:

A- Boiler hood.
B- heat exchanger.
C- pressure gauge.
D- a gas burner.

Erklärung

Frage 72 von 73

What type of gas heating boiler component is shown in the image?

Wähle eine der folgenden:

A- water thermostat.
B- diverter valve.
C- air pressure switch.
D- Multifunctional valve.

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Frage 73 von 73

which one of the following boilers requires a drainage pipe to discharge the water produced during the combustion process?

Wähle eine der folgenden:

A- back boiler
B- combination boiler.
C- independent boiler
D- Condensing boiler.

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Antwort prüfen

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Central heating revision

L3 Central Heating Revision

L3 Central Heating Revision

Frage 1 von 73

According to the Domestic Heating Compliance Guide, a device that takes heat energy from a low-temperature source and upgrades it to a temperature that could be used for heating, is known as a:

Wähle eine der folgenden:

Erklärung

Frage 2 von 73

Which one of the following is used to indicate the U value through a building fabric?

Wähle eine der folgenden:

Erklärung

Frage 3 von 73

Which one of the following Building Regulations covers the requirements for combustion appliances?

Wähle eine der folgenden:

Erklärung

Frage 4 von 73

Which one of the following government departments provides information on the Boiler Efficiency Database?

Wähle eine der folgenden:

Erklärung

Frage 5 von 73

A central heating system in which the water supplied to the system is fed directly from the cold water supply pipe is

Wähle eine der folgenden:

Erklärung

Frage 6 von 73

According to the Domestic Heating Compliance Guide, what is the minimum SEDBUK value for a gas or oil fired central heating boiler installed in an existing dwelling after 1 April 2007?

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Frage 7 von 73

Which one of the following methods is usually preferred for determining the boiler output when replacing an existing oil or gas fired boiler?

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Frage 8 von 73

According to the Domestic Heating Compliance Guide, which one of the following organisations operates an approvals scheme for solid fuel boilers and heating appliances?

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Frage 9 von 73

Which one of the following should be the minimum distance, in mm, between a boiler flue and any combustible material when it passes through a cupboard?

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Frage 10 von 73

Which one of the following would be the most desirable pump location in an open vented fully pumped central heating system?

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Frage 11 von 73

Which one of the following is the name of the point at which an expansion vessel connects to a central heating system?

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Frage 12 von 73

The condensate pipework from a high efficiency (condensing) boiler should be laid at a minimum fall of

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Frage 13 von 73

Which one of the following test methods is used to determine the soundness of a central heating system?

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Frage 14 von 73

Which one of the following types of central heating system is shown in the Figure?

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Frage 15 von 73

Which one of the following types of central heating system is shown in the Figure?

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Frage 16 von 73

Which one of the following types of central heating system is shown in the Figure?

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Frage 17 von 73

Which one of the following is the likely effect on the heating system when the pump is positioned as shown in the Figure?

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Frage 18 von 73

Which one of the following is the likely effect on the heating system when the pump is positioned as shown in the Figure?

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Frage 19 von 73

In the central heating system shown in the Figure , what is the name of Component A

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Frage 20 von 73