Level 3 Diploma in Plumbing and Domestic Heating

The main purpose of central heating is to:

• provide cooling to a building

• heat water for cooking

• maintain a comfortable indoor temperature

• generate electricity

Which of the following statements is true about central heating?

• It provides heat only in one room.

• It provides thermal comfort within a property.

• It is less efficient than an open fire.

Thermal comfort is attained by:

• adjusting the thermostat

• wearing appropriate clothing

• using fans or air conditioning

• all of the above

What is the main feature of full central heating?

• Heats only one room

• Heats all rooms to a specific temperature

• Does not heat when outside temperature is -1°C

• Only heats during the day.

Fill in the blank: Background central heating is designed to take the chill out of the rooms and heat them to a ______ temperature.

• lower

• higher

• moderate

• extreme

What are the two main categories of central heating systems based on how water enters the system?

• Low pressure, open vented systems and Sealed, pressurised systems

• High pressure, closed vented systems and Open, non-pressurised systems

• Low pressure, closed vented systems and Sealed, non-pressurised systems

• High pressure, open vented systems and Sealed, pressurised systems

Fill in the blank: Sealed, pressurised systems are fed directly from the mains cold water and incorporate an ______ to take up the expansion of the heated water.

• expansion vessel.

• pressure gauge.

• overflow pipe.

• temperature sensor.

What is a disadvantage of low pressure, open vented systems?

• Requires less space

• Requires more space for feed and expansion cisterns

• More efficient

• Easier to install

The purpose of using an expansion vessel in sealed systems is to:

• absorb excess water pressure

• increase water temperature

• reduce water flow

• filter impurities

Which component in the sealed system is responsible for safety control?

• Compressor

• Condenser

• Expansion Valve

• Safety Valve