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L3 Central Heating Revision

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Central heating revision
nigel poole
Quiz by nigel poole, updated more than 1 year ago More Less
gaby khalil
Created by gaby khalil over 9 years ago
nigel poole
Copied by nigel poole over 2 years ago
nigel poole
Copied by nigel poole over 2 years ago
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Resource summary

Question 1

Question
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)
Answer
  • a) Negative point.
  • b) Neutral point.
  • c) Positive point.
  • d) Central point.

Question 2

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

Question 3

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

Question 4

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

Question 5

Question
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)
Answer
  • 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.

Question 6

Question
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)
Answer
  • 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.

Question 7

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

Question 8

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

Question 9

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

Question 10

Question
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)
Answer
  • 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.

Question 11

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

Question 12

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

Question 13

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

Question 14

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

Question 15

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

Question 16

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

Question 17

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

Question 18

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

Question 19

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

Question 20

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

Question 21

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

Question 22

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

Question 23

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

Question 24

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

Question 25

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

Question 26

Question
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?
Answer
  • a) 76%.
  • b) 80%.
  • c) 82%.
  • d) 86%.

Question 27

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

Question 28

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

Question 29

Question
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?
Answer
  • a) 10.
  • b) 15.
  • c) 25.
  • d) 50.

Question 30

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

Question 31

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

Question 32

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

Question 33

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

Question 34

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

Question 35

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

Question 36

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

Question 37

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

Question 38

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

Question 39

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

Question 40

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

Question 41

Question
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?
Answer
  • a) 2 kW.
  • b) 4 kW.
  • c) 6 kW.
  • d) 8 kW.

Question 42

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

Question 43

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

Question 44

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

Question 45

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

Question 46

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

Question 47

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

Question 48

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

Question 49

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

Question 50

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

Question 51

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

Question 52

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

Question 53

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

Question 54

Question
When commissioning central heating systems, manufacturers generally recommend that the system is
Answer
  • 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.

Question 55

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

Question 56

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

Question 57

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

Question 58

Question
Your Diploma in plumbing level 3 is an NVQ qualification
Answer
  • True
  • False

Question 59

Question
When completing your plumbing L3 diploma you will be gas qualified engineer
Answer
  • True
  • False

Question 60

Question
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?
Answer
  • 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

Question 61

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

Question 62

Question
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?
Answer
  • a) Optimum start.
  • b) Delayed start.
  • c ) Thermo start
  • d) Manual start.

Question 63

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

Question 64

Question
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?
Answer
  • 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.

Question 65

Question
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
Answer
  • 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

Question 66

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

Question 67

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

Question 68

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

Question 69

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

Question 70

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

Question 71

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

Question 72

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

Question 73

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