Plumbing level 2 - PP2 - Central Heating

What are the common diameters for R220 soft coiled microbore pipe?

• 8mm and 10mm

• 15mm and 22mm

• 28mm and 22mm

• 6mm and 12mm

In what lengths is R250 half hard straight pipe sold?

• 25, 50 and 100 metres

• 3 and 6 metres

• 10 and 25 metres

• 1, 2, 3 and 6 metres

What is one advantage of a microbore system?

• Cheaper

• More durable

• Easier to install

• Contains less water, so it heats up more quickly

What material is rarely used in domestic installations but common in commercial and industrial installations?

• PVC

• Copper

• Polybutylene

• Low carbon steel

What color is used to indicate medium grade low carbon steel?

• Blue

• Green

• Red

• Brown

What is a characteristic of polybutylene pipe?

• Heavy

• Corrodes easily

• Expensive

• Microporous

What is the primary purpose of insulation in domestic heating systems?

• Conserves fuel and power

• Reduces noise

• Makes pipes heavier

• Increases water flow

Which material is not used for insulation?

• Phenolic foam

• Polyethylene foam

• Copper

• Nitrile rubber

What should be insulated whenever they pass outside the heated living space?

• Electrical wires

• Gas pipes

• Secondary circuit for cold water

• Primary circuit for heating and hot water

What is a benefit of insulating pipes?

• Saves energy

• Increases water pressure

• Reduces pipe diameter

• Increases installation cost