L3 Central Heating Revision

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Pregunta 1 de 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:

Selecciona una de las siguientes respuestas posibles:

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

Explicación

Pregunta 2 de 73

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

Selecciona una de las siguientes respuestas posibles:

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

Explicación

Pregunta 3 de 73

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

Selecciona una de las siguientes respuestas posibles:

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).

Explicación

Pregunta 4 de 73

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

Selecciona una de las siguientes respuestas posibles:

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)

Explicación

Pregunta 5 de 73

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

Selecciona una de las siguientes respuestas posibles:

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

Explicación

Pregunta 6 de 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?

Selecciona una de las siguientes respuestas posibles:

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

Explicación

Pregunta 7 de 73

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

Selecciona una de las siguientes respuestas posibles:

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

Explicación

Pregunta 8 de 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?

Selecciona una de las siguientes respuestas posibles:

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

Explicación

Pregunta 9 de 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?

Selecciona una de las siguientes respuestas posibles:

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

Explicación

Pregunta 10 de 73

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

Selecciona una de las siguientes respuestas posibles:

Explicación

Pregunta 11 de 73

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

Selecciona una de las siguientes respuestas posibles:

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

Explicación

Pregunta 12 de 73

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

Selecciona una de las siguientes respuestas posibles:

a) 1.5º
b) 2.5º
c) 5º
d) 10º

Explicación

Pregunta 13 de 73

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

Selecciona una de las siguientes respuestas posibles:

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

Explicación

Pregunta 14 de 73

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

Selecciona una de las siguientes respuestas posibles:

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.

Explicación

Pregunta 15 de 73

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

Selecciona una de las siguientes respuestas posibles:

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.

Explicación

Pregunta 16 de 73

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

Selecciona una de las siguientes respuestas posibles:

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.

Explicación

Pregunta 17 de 73

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

Selecciona una de las siguientes respuestas posibles:

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.

Explicación

Pregunta 18 de 73

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

Selecciona una de las siguientes respuestas posibles:

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.

Explicación

Pregunta 19 de 73

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

Selecciona una de las siguientes respuestas posibles:

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

Explicación

Pregunta 20 de 73

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

Selecciona una de las siguientes respuestas posibles:

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

Explicación

Pregunta 21 de 73

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

Selecciona una de las siguientes respuestas posibles:

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

Explicación

Pregunta 22 de 73

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

Selecciona una de las siguientes respuestas posibles:

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

Explicación

Pregunta 23 de 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?

Selecciona una de las siguientes respuestas posibles:

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.

Explicación

Pregunta 24 de 73

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

Selecciona una de las siguientes respuestas posibles:

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

Explicación

Pregunta 25 de 73

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

Selecciona una de las siguientes respuestas posibles:

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

Explicación

Pregunta 26 de 73

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

Selecciona una de las siguientes respuestas posibles:

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.

Explicación

Pregunta 27 de 73

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

Selecciona una de las siguientes respuestas posibles:

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

Explicación

Pregunta 28 de 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?

Selecciona una de las siguientes respuestas posibles:

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

Explicación

Pregunta 29 de 73

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

Selecciona una de las siguientes respuestas posibles:

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

Explicación

Pregunta 30 de 73

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

Selecciona una de las siguientes respuestas posibles:

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.

Explicación

Pregunta 31 de 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

Selecciona una de las siguientes respuestas posibles:

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

Explicación

Pregunta 32 de 73

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

Selecciona una de las siguientes respuestas posibles:

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

Explicación

Pregunta 33 de 73

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

Selecciona una de las siguientes respuestas posibles:

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

Explicación

Pregunta 34 de 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

Selecciona una de las siguientes respuestas posibles:

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).

Explicación

Pregunta 35 de 73

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

Selecciona una de las siguientes respuestas posibles:

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.

Explicación

Pregunta 36 de 73

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

Selecciona una de las siguientes respuestas posibles:

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

Explicación

Pregunta 37 de 73

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

Selecciona una de las siguientes respuestas posibles:

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.

Explicación

Pregunta 38 de 73

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

Selecciona una de las siguientes respuestas posibles:

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.

Explicación

Pregunta 39 de 73

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

Selecciona una de las siguientes respuestas posibles:

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.

Explicación

Pregunta 40 de 73

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

Selecciona una de las siguientes respuestas posibles:

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

Explicación

Pregunta 41 de 73

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

Selecciona una de las siguientes respuestas posibles:

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

Explicación

Pregunta 42 de 73

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

Selecciona una de las siguientes respuestas posibles:

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

Explicación

Pregunta 43 de 73

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

Selecciona una de las siguientes respuestas posibles:

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

Explicación

Pregunta 44 de 73

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

Selecciona una de las siguientes respuestas posibles:

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.

Explicación

Pregunta 45 de 73

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

Selecciona una de las siguientes respuestas posibles:

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

Explicación

Pregunta 46 de 73

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

Selecciona una de las siguientes respuestas posibles:

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

Explicación

Pregunta 47 de 73

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

Selecciona una de las siguientes respuestas posibles:

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

Explicación

Pregunta 48 de 73

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

Selecciona una de las siguientes respuestas posibles:

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

Explicación

Pregunta 49 de 73

Your Diploma in plumbing level 3 is an NVQ qualification

Selecciona uno de los siguientes:

VERDADERO
FALSO

Explicación

Pregunta 50 de 73

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

Selecciona uno de los siguientes:

VERDADERO
FALSO

Explicación

Pregunta 51 de 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?

Selecciona una de las siguientes respuestas posibles:

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

Explicación

Pregunta 52 de 73

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

Selecciona una de las siguientes respuestas posibles:

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.

Explicación

Pregunta 53 de 73

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

Selecciona una de las siguientes respuestas posibles:

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.

Explicación

Pregunta 54 de 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?

Selecciona una de las siguientes respuestas posibles:

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

Explicación

Pregunta 55 de 73

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

Selecciona una de las siguientes respuestas posibles:

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

Explicación

Pregunta 56 de 73

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

Selecciona una de las siguientes respuestas posibles:

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

Explicación

Pregunta 57 de 73

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

Selecciona una de las siguientes respuestas posibles:

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.

Explicación

Pregunta 58 de 73

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

Selecciona una de las siguientes respuestas posibles:

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.

Explicación

Pregunta 59 de 73

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

Selecciona una de las siguientes respuestas posibles:

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

Explicación

Pregunta 60 de 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?

Selecciona una de las siguientes respuestas posibles:

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.

Explicación

Pregunta 61 de 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

Selecciona una de las siguientes respuestas posibles:

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

Explicación

Pregunta 62 de 73

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

Selecciona una de las siguientes respuestas posibles:

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.

Explicación

Pregunta 63 de 73

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

Selecciona una de las siguientes respuestas posibles:

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

Explicación

Pregunta 64 de 73

What type of heating component is shown in the image?

Selecciona una de las siguientes respuestas posibles:

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

Explicación

Pregunta 65 de 73

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

Selecciona una de las siguientes respuestas posibles:

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

Explicación

Pregunta 66 de 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

Selecciona una de las siguientes respuestas posibles:

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

Explicación

Pregunta 67 de 73

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

Selecciona una de las siguientes respuestas posibles:

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

Explicación

Pregunta 68 de 73

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

Selecciona una de las siguientes respuestas posibles:

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

Explicación

Pregunta 69 de 73

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

Selecciona una de las siguientes respuestas posibles:

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

Explicación

Pregunta 70 de 73

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

Selecciona una de las siguientes respuestas posibles:

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

Explicación

Pregunta 71 de 73

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

Selecciona una de las siguientes respuestas posibles:

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

Explicación

Pregunta 72 de 73

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

Selecciona una de las siguientes respuestas posibles:

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

Explicación

Pregunta 73 de 73

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

Selecciona una de las siguientes respuestas posibles:

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

Explicación

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	Creado por gaby khalil hace casi 10 años

Central heating revision

L3 Central Heating Revision

Pregunta 1 de 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:

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Explicación

Pregunta 2 de 73

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

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Explicación

Pregunta 3 de 73

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

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Explicación

Pregunta 4 de 73

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

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Explicación

Pregunta 5 de 73

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

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Explicación

Pregunta 6 de 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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Explicación

Pregunta 7 de 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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Explicación

Pregunta 8 de 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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Explicación

Pregunta 9 de 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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Explicación

Pregunta 10 de 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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Explicación

Pregunta 11 de 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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Explicación

Pregunta 12 de 73

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

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Pregunta 13 de 73

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

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Explicación

Pregunta 14 de 73

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

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Explicación

Pregunta 15 de 73

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

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Explicación

Pregunta 16 de 73

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

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Explicación

Pregunta 17 de 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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Explicación

Pregunta 18 de 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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Explicación

Pregunta 19 de 73

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

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Explicación

Pregunta 20 de 73

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