Central heating revision level 2

1. Which one of the following documents in the building regulations covers the conservation of fuel and power in domestic properties?

• Part L3.

• Part L4

• Part L1

• Part L2

1. An automatic bypass valve is activated by the

• boiler being shutting off

• programmer being switched on

• pressure of the incoming water service

• pressure created within the system

1. The main reason a radiator should be installed 150 mm above floor level is to

• reduce the risk of fire

• allow the heat to circulate

• protect the flooring from possible leaks

• allow easier access for maintenance work

1. A thermostatic radiator valve opens and closes as a result of the temperature of the

• boiler thermostat

• room it is installed in

• stored hot water

• water in the heating system

1. A pump should be positioned so that the heating system is operating under

• no pressure

• positive pressure

• both positive and negative pressure

• negative pressure

When soundness testing a rigid pipe system, the test pressure should be

• 1 ½ times the maximum working pressure

• 2 times the maximum working pressure

• 2½ times the maximum working pressure

• 10 times the maximum working pressure

1. Installing an air separator allows which one of the following to take place?

• Close coupling of the flow and return connections.

• Close coupling of the pump and the vent connections.

• Close coupling of the cold feed and vent connections.

• Close coupling of the motorised valve connection

Which port is the central heating flow connected to on a mid-position valve

• AB

• A

• B

• BA

In a central heating installation the primary pipework connects the

• boiler and the cylinder

• cylinder and the outlets

• cylinder and the radiators

• feed cistern and the cylinder

1. By which one of the following processes do radiators give out 85% of their heat?

• Conduction.

• Radiation.

• Emission

• Convection.