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Central Heating 3

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Quiz on Central Heating 3, created by Jarmo Tossavainen on 14/05/2018.
Jarmo Tossavainen
Quiz by Jarmo Tossavainen, updated more than 1 year ago
Jarmo Tossavainen
Created by Jarmo Tossavainen about 6 years ago
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Resource summary

Question 1

Question
A heating circuit in which the flow and return pipes are completely separated until they connect to the boiler is known as a
Answer
  • a) one pipe system
  • b) two pipe system
  • c) sealed system
  • d) gravity system.

Question 2

Question
A British Standard that includes detail on the requirements for installing open vented central heating systems in dwellings is
Answer
  • a) BS EN 12056
  • b) BS 6700
  • c) BS EN 12828
  • d) BS 5449.

Question 3

Question
Which pipe connects to port X in the diagram of an air separator below?
Image:
Air Sep (binary/octet-stream)
Answer
  • a) Open vent pipe.
  • b) Primary flow to system.
  • c) Primary flow from boiler.
  • d) Cold feed pipe.

Question 4

Question
What is the recommended actual capacity of the feed and expansion cistern in a small open vented indirect central heating system?
Answer
  • a) 6 litres
  • b) 18 litres
  • c) 52 litres
  • d) 100 litres.

Question 5

Question
What is the name of the component shown below?
Image:
Trv (binary/octet-stream)
Answer
  • a) Temperature relief valve.
  • b) Pressure relief valve.
  • c) Pressure regulating valve.
  • d) Thermostatic radiator valve.

Question 6

Question
Which one of the following gas boilers overcomes the need for a cold water storage cistern, feed and expansion cistern and hot water storage vessel?
Answer
  • a) Back-boiler.
  • b) Traditional.
  • c) Combination.
  • d) Room-heater.

Question 7

Question
What is the recommended maximum clip spacing distance for a vertical 15 mm copper pipe?
Answer
  • a) 1200 mm.
  • b) 1800 mm.
  • c) 2000 mm.
  • d) 2500 mm.

Question 8

Question
The Domestic Heating Compliance Guide supports which document?
Answer
  • a) British Standard 8000.
  • b) The Water Supply (Water Fittings) Regulations.
  • c) British Standard 5449.
  • d) Building Regulations Approved Document L1.

Question 9

Question
Minimum controls which must be provided when replacing a gravity fed cylinder supplied from a gas boiler, as laid down in the Domestic Heating Compliance Guide, is
Answer
  • a) a thermo-mechanical thermostat
  • b) no minimum control required
  • c) fully motorised two port valve
  • d) electronic thermostat.

Question 10

Question
What type of heat emitter is shown in the following photograph?
Image:
Column Radiator (binary/octet-stream)
Answer
  • a)Hospital radiator.
  • b) Panel radiator.
  • c) Column radiator.
  • d) Skirting heater.

Question 11

Question
The drawing below shows the connection arrangements to a feed and expansion cistern, pump, open vent and cold feed pipe. What is the likely outcome of positioning the system in the left shown?
Image:
Pump Positions (binary/octet-stream)
Answer
  • a) The cold feed pipe is at the point of highest positive pressure.
  • b) The system will be largely under negative pressure.
  • c) A neutral pressure will be maintained in all system pipework.
  • d) The system will pump over the open vent pipe.

Question 12

Question
The minimum size of the cold feed pipe to a fully pumped heating system in a domestic dwelling is
Answer
  • a) 15 mm
  • b) 22 mm
  • c) 28 mm
  • d) 35 mm.

Question 13

Question
A three-port mid-position valve can provide heated water to
Answer
  • a) only the heating circuit
  • b) only the hot water circuit
  • c) both the heating and hot water circuit, but not both together
  • d) both the heating or hot water circuit and both together.

Question 14

Question
What type of central heating control component is normally used in conjunction with a frost thermostat to conserve energy when exposed parts of a central heating system are required to be protected against frost damage?
Answer
  • a) Room thermostat
  • b) Pipe thermostat.
  • c) Automatic bypass valve.
  • d) Frost relief valve.

Question 15

Question
Water in a wet central heating system is normally treated with
Answer
  • a) sodium hypochlorite
  • b) corrosion inhibitor
  • c) caustic soda solution
  • d) disinfectant.

Question 16

Question
What type of central heating component is shown in the photograph below?
Image:
Room Thermostat (binary/octet-stream)
Answer
  • a) Programmer.
  • b) Timer.
  • c) Motorised valve.
  • d) Room thermostat.

Question 17

Question
The method by which panel radiators transmit most of their heat is
Answer
  • a) conduction
  • b) convection
  • c) radiation
  • d) condensation.

Question 18

Question
The water level in the feed and expansion cistern of a central heating system should be set to allow sufficient room for
Answer
  • a) thermal expansion of the water
  • b) coping with pumping over
  • c) air venting
  • d) reduction of noise when filling.

Question 19

Question
The normal position for a cylinder thermostat that is strapped to a cylinder is approximately
Answer
  • a) at the top of the cylinder
  • b) a third of the way down the cylinder from the top
  • c) half way down the cylinder
  • d) a third of the way up from the bottom of the cylinder.

Question 20

Question
The type of heating system that uses 2 x two port motorised valves is known as a
Answer
  • a) A thermostatic radiator valve.
  • b) A lockshield type valve.
  • c) A wheelhead type valve.
  • d) An electro mechanical valve.

Question 21

Question
Which component is used in a heating system fitted with a low water content boiler to ensure that a minimum water flow rate is maintained through the boiler heat exchanger at all times?
Answer
  • a) Automatic bypass valve.
  • b) Pressure relief valve.
  • c) Pressure reducing valve.
  • d) Lockshield gate valve.

Question 22

Question
A central heating control component which can regulate the on/off periods of two or more zones in a system is known as a
Answer
  • frost thermostat
  • room thermostat
  • thermo-mechanical valve
  • programmer.

Question 23

Question
Before you carry out a hydraulic pressure test on a new central heating system you should perform
Answer
  • a) a full disinfection of the system
  • b) a hot flush of the system and add corrosion inhibitor
  • c) a visual inspection of the system
  • d) a heat loss calculation of the system.

Question 24

Question
The following diagram shows the actions of which component in a heating system?
Answer
  • a) Boiler fan.
  • b) Circulating pump.
  • c) Shower pump.
  • d) Diverter valve.
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