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What is one of the uses of air within the plumbing industry?

• It is used to cool down hot water systems.

• It can be used as a heating medium in warm air heating systems.

• It is used to purify water in plumbing systems.

• It is used as a lubricant for plumbing joints.

What is generally preferred at initial filling by manufacturers for use as a pressure charge in expansion vessels?

• Oxygen

• Carbon dioxide

• Nitrogen

• Helium

What is one application of high-pressure air in the plumbing industry?

• To measure water pressure in pipes.

• To clear blocked drains.

• To weld pipes together.

• To test for leaks in sealed systems.

Why has the use of steam as a heating medium declined in recent years?

• Because steam is no longer available

• Because of new, more efficient system designs

• Because steam is too expensive to produce

• Because steam cannot be used in modern applications

What is one of the current uses of steam in heating systems?

• To cool down properties

• To increase humidity in homes

• To replace electrical heating systems

• As a heating medium instead of water in heat emitters

What is a new application of steam mentioned in the text?

• In new combined heat and power applications (CHP) to generate electricity and warm properties

• In solar power generation

• In nuclear power plants

• In geothermal heating systems

Steam is used in hot water production by which method?

• Using small electric heaters

• Using solar panels

• Using large hot water calorifiers

• Using cold water storage systems

What is the most widely used fuel in the UK?

• Coal

• Natural gas

• Electricity

• Oil

Natural gas is used as a fuel for which of the following domestic applications?

• Gas fires

• Refrigerators

• Washing machines

• Televisions

Which of the following is NOT a use of natural gas?

• Room heaters

• Central heating boilers

• Water heaters

• Air conditioning