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L3 Central Heating Revision

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Central heating revision
gaby khalil
Quiz por gaby khalil, atualizado more than 1 year ago
gaby khalil
Criado por gaby khalil mais de 9 anos atrás
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Resumo de Recurso

Questão 1

Questão
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:
Responda
  • a) heat pump
  • b) solar heating panel
  • c) combined heat and power boiler
  • d) condensing boiler

Questão 2

Questão
Which one of the following is used to indicate the U value through a building fabric?
Responda
  • a) W/m² ºC.
  • b) W/m³ ºC.
  • c) W x r ºC.
  • d) W + r ºC.

Questão 3

Questão
Which one of the following Building Regulations covers the requirements for combustion appliances?
Responda
  • 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).

Questão 4

Questão
Which one of the following government departments provides information on the Boiler Efficiency Database?
Responda
  • 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)

Questão 5

Questão
A central heating system in which the water supplied to the system is fed directly from the cold water supply pipe is
Responda
  • a) open vented fully pumped
  • b) open vented gravity
  • c) unvented hot water
  • d) sealed system

Questão 6

Questão
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?
Responda
  • a) 76%.
  • b) 80%.
  • c) 82%.
  • d) 86%.

Questão 7

Questão
Which one of the following methods is usually preferred for determining the boiler output when replacing an existing oil or gas fired boiler?
Responda
  • a) Replace like for like.
  • b) Whole house boiler sizing method.
  • c) Add 30% to existing output.
  • d) Only use SEDBUK band D boilers.

Questão 8

Questão
According to the Domestic Heating Compliance Guide, which one of the following organisations operates an approvals scheme for solid fuel boilers and heating appliances?
Responda
  • a) CORGI.
  • b) OFTEC.
  • c) HETAS.
  • d) NICEIC.

Questão 9

Questão
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?
Responda
  • a) 10.
  • b) 15.
  • c) 25.
  • d) 50.

Questão 10

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

Questão 11

Questão
Which one of the following is the name of the point at which an expansion vessel connects to a central heating system?
Image:
4296c410-dad9-4b3e-9426-9f5fe41bba9a (image/jpg)
Responda
  • a) Negative point.
  • b) Neutral point.
  • c) Positive point.
  • d) Central point.

Questão 12

Questão
The condensate pipework from a high efficiency (condensing) boiler should be laid at a minimum fall of
Responda
  • a) 1.5º
  • b) 2.5º
  • c) 5º
  • d) 10º

Questão 13

Questão
Which one of the following test methods is used to determine the soundness of a central heating system?
Responda
  • a) Hydraulic pressure.
  • b) Visual inspection.
  • c) Hydrostatic pressure.
  • d) Pneumatic pressure.

Questão 14

Questão
Which one of the following types of central heating system is shown in the Figure?
Image:
f16b8b3f-05fc-44d9-a348-14ac0fb2fce9 (image/jpg)
Responda
  • 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.

Questão 15

Questão
Which one of the following types of central heating system is shown in the Figure?
Image:
e3163c41-ad05-42c8-bb5a-6756b98f2104 (image/jpg)
Responda
  • 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.

Questão 16

Questão
Which one of the following types of central heating system is shown in the Figure?
Image:
21088220-2d52-49ea-8cf6-97cbbc792532 (image/jpg)
Responda
  • 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.

Questão 17

Questão
Which one of the following is the likely effect on the heating system when the pump is positioned as shown in the Figure?
Image:
c9467245-2d43-452b-8905-be1a219964b8 (image/png)
Responda
  • 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.

Questão 18

Questão
Which one of the following is the likely effect on the heating system when the pump is positioned as shown in the Figure?
Image:
db0a903d-ff07-42b1-98d2-ebc5b9ef2acd (image/png)
Responda
  • 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.

Questão 19

Questão
In the central heating system shown in the Figure , what is the name of Component A
Image:
0f93e9d2-5e71-4a35-bfa2-998e2b3225f1 (image/png)
Responda
  • a) Zone valve.
  • b) 3 port mid position valve.
  • c) Pressure relief valve.
  • d) Automatic air vent.

Questão 20

Questão
The minimum size of earthling cable, in mm, used to bond the main services in a domestic property is
Responda
  • a) 2.5 mm2
  • b) 6 mm2
  • c) 10mm2
  • d) 12 mm2

Questão 21

Questão
Which one of the following items of equipment could be used to test temperature differential between the heating flow and return pipework?
Responda
  • a) Multi-meter
  • b) Manometer.
  • c) Ammeter.
  • d) Digital thermometer.

Questão 22

Questão
The pressure gauge in a sealed heating system should be capable of reading a pressure range, in bars, of
Responda
  • a) 0 to 3
  • b) 0 to 4
  • c) 1 to 4
  • d) 2 to 5.

Questão 23

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

Questão 24

Questão
Information related to the performance specification of an LPG fired central heating boiler is obtained from
Responda
  • a) SEDBUK
  • b) Building Regulations Part L (F in Northern Ireland)
  • c) Manufacturer’s instructions
  • d) CORGI.

Questão 25

Questão
When commissioning a gas fired system boiler, adjustment to the heat output of the boiler is achieved by
Responda
  • a) adjusting the room thermostat
  • b) adjusting the cylinder thermostat
  • c) range rating the boiler
  • d) balancing the system.

Questão 26

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

Questão 27

Questão
Which one of the following would contain a fault finding chart for a specific solid fuel boiler?
Responda
  • a) HETAS manual.
  • b) Domestic Heating Compliance Guide.
  • c) OFTEC manual.
  • d) Manufacturer’s instructions.

Questão 28

Questão
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?
Responda
  • a) 2 kW.
  • b) 4 kW.
  • c) 6 kW.
  • d) 8 kW.

Questão 29

Questão
Which one of the following should be included on a Benchmark Service Interval Record?
Responda
  • a) Flow and return temperature.
  • b) Gas inlet pressure.
  • c) Gas Safe Register ID card serial number.
  • d) Gas flue analysis results.

Questão 30

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

Questão 31

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

Questão 32

Questão
On boilers fitted with digital displays, which one of the following display codes takes priority over other codes?
Responda
  • a) Status.
  • b) Diagnostic.
  • c) Fault.
  • d) Memory.

Questão 33

Questão
Which one of the following government departments provides information on the Boiler Efficiency Database?
Responda
  • a) DfES.
  • b) DEFRA.
  • c) BERR.
  • d) DIUS.

Questão 34

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

Questão 35

Questão
When installing a high efficiency (condensing boiler), provision must be made for a
Responda
  • 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.

Questão 36

Questão
Which one of the following is the name of Component A shown in the Figure?
Image:
f571e367-0a6d-47e2-9127-b18ad44a7e51 (image/png)
Responda
  • a) Automatic by-pass valve.
  • b) Wheel head valve.
  • c) 2 port motorised valve.
  • d) Air separator.

Questão 37

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

Questão 38

Questão
14 Which one of the following types of central heating system is shown in the Figure?
Image:
7bd9abea-38f4-4c31-8b77-7ed3a4a08a0e (image/png)
Responda
  • 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.

Questão 39

Questão
Which one of the following is the likely effect on the heating system when the pump is positioned as shown in the Figure?
Image:
5fa80cd2-e10c-431a-9df0-b5ea8855d901 (image/png)
Responda
  • 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.

Questão 40

Questão
Which one of the following is the correct size of fuse, in amps, for protecting a domestic central heating circuit?
Responda
  • a) 3 amp
  • b) 5. amp
  • c) 13. amp
  • d) 16. amp

Questão 41

Questão
The pressure relief valve in a sealed heating system should discharge at what pressure?
Responda
  • a) 1bar
  • b) 2 bars
  • c) 3 bars
  • d) 4 bars

Questão 42

Questão
The meaning of the status codes on the digital display indicator on a central heating boiler can be obtained from
Responda
  • a) inside the combustion chamber
  • b) SEDBUK
  • c) Manufacturer’s instructions
  • d) SBGI.

Questão 43

Questão
Information related to the performance specification of a natural gas fired central heating boiler is obtained from
Responda
  • a) CORGI
  • b) Building Regulations Part L (F in Northern Ireland)
  • c) SEDBUK
  • d) Manufacturer’s instructions.

Questão 44

Questão
When commissioning central heating systems, manufacturers generally recommend that the system is
Responda
  • 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.

Questão 45

Questão
Which one of the following system components provides an indication that a sealed central heating system has been installed?
Responda
  • a) Heat leak radiator.
  • b) mid position valve.
  • c) Expansion vessel.
  • d) Air separator.

Questão 46

Questão
Which one of the following would contain a fault finding chart for a specific high efficiency gas systems boiler?
Responda
  • a) British Standard 6700.
  • b) Domestic Heating Compliance Guide.
  • c) Manufacturer’s instructions.
  • d) British Standard 5449.

Questão 47

Questão
Insufficient water flow rate through the heat exchanger of a boiler is usually the cause of
Responda
  • a) kettling
  • b) temperature relief discharge
  • c) pressure relief discharge
  • d) boiler overrun.

Questão 48

Questão
Which one of the following shown in the Figure is a manufacturer’s replacement part for a typical gas fired combination boiler?
Image:
1f92734f-8f79-4873-8375-6fa4d3805f7c (image/png)
Responda
  • a) Compact thermal module.
  • b) Fan assembly.
  • c) Secondary heat exchanger.
  • d) Burner assembly.

Questão 49

Questão
Your Diploma in plumbing level 3 is an NVQ qualification
Responda
  • True
  • False

Questão 50

Questão
When completing your plumbing L3 diploma you will be gas qualified engineer
Responda
  • True
  • False

Questão 51

Questão
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?
Responda
  • 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

Questão 52

Questão
What type of open vented system is shown in the diagram?
Image:
87b8b696-6f7a-40cb-b39f-e6961901cb5a (image/png)
Responda
  • 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.

Questão 53

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

Questão 54

Questão
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?
Responda
  • a) Optimum start.
  • b) Delayed start.
  • c ) Thermo start
  • d) Manual start.

Questão 55

Questão
Which one of the following types of heating system uses the components In the image shown?
Image:
e131d552-590b-408f-97c6-51635f47e912 (image/png)
Responda
  • a) C Plan.
  • d) W Plan.
  • c) S Plan.
  • b) Y Plan,

Questão 56

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

Questão 57

Questão
Which one of the following Is a correct description of the circuit shown?
Image:
4fb00a76-00cf-4723-8ce2-68be79ae8711 (image/png)
Responda
  • 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.

Questão 58

Questão
which one of the following heating systems is Indicated by the wiring diagram shown?
Image:
641e2d60-80ea-4bd1-8ef5-350d43fd8cde (image/png)
Responda
  • 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.

Questão 59

Questão
Which one of the following heating systems is indicated by the wiring diagram shown?
Image:
2e41f6ef-c5bb-439b-8070-5f5d95f11373 (image/png)
Responda
  • a) S plan plus
  • b) C plan plus
  • c) W plan
  • d) Y plan

Questão 60

Questão
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?
Responda
  • 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.

Questão 61

Questão
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
Responda
  • 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

Questão 62

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

Questão 63

Questão
Which one of the following identifies the most important factor when calculating the pipework size for a heating system?
Responda
  • A- Water density
  • B- Water velocity.
  • C- Water hardness
  • D- Water viscosity.

Questão 64

Questão
What type of heating component is shown in the image?
Image:
76d779a8-19a9-447e-9ab5-e226e1c1267e (image/png)
Responda
  • A- a pressure gauge.
  • B- an automatic air vent
  • C- an electric thermostat
  • D- a temperature gauge.

Questão 65

Questão
Both the pressure relief and temperature control valves fail in a sealed heating system. What is the likely outcome in such situation?
Image:
6bf3a27a-9703-4c40-a3d1-b6950d55dabb (image/png)
Responda
  • A- The boiler may stop working.
  • B- The pump may stop working
  • C- The pressure vessel may explode.
  • D- The pressure vessel may overflow.

Questão 66

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

Questão 67

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

Questão 68

Questão
In a sealed central heating system, which one of the following replaces the open vent pipe in a conventional system?
Responda
  • A- Filling loop.
  • B- Non-return valve.
  • C- Pressure relief valve
  • D- Temperature and pressure gauge.

Questão 69

Questão
The most appropriate position for an expansion vessel is indicated by which one of the following points in the system?
Responda
  • A- the highest point.
  • B- the lowest point.
  • C- the coolest part of the system.
  • D- the hottest part of the system.

Questão 70

Questão
Which type of fuel would not be used in rural areas of the UK where access to a piped fuel supply Is unavailable?
Responda
  • A- Fuel oil
  • B- Natural gas.
  • C- Heat pumps.
  • D- Solid fuel.

Questão 71

Questão
what type of gas heating boiler component is shown In the Image?
Image:
f238838f-c9e5-4fe4-943f-8e438c819b6f (image/jpg)
Responda
  • A- Boiler hood.
  • B- heat exchanger.
  • C- pressure gauge.
  • D- a gas burner.

Questão 72

Questão
What type of gas heating boiler component is shown in the image?
Image:
9409bfa8-5bca-4fb2-8196-12fcfe1c0c0b (image/png)
Responda
  • A- water thermostat.
  • B- diverter valve.
  • C- air pressure switch.
  • D- Multifunctional valve.

Questão 73

Questão
which one of the following boilers requires a drainage pipe to discharge the water produced during the combustion process?
Responda
  • A- back boiler
  • B- combination boiler.
  • C- independent boiler
  • D- Condensing boiler.

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