Copy of Unit: 205, Requirements of Cold Water Supplies into Domestic Dwellings 2

Multiple Choice

Which of the following is the minimum required depth for a communication pipe in a domestic cold water supply system?

• 250mm

• 750mm

• 1350mm

• 2000mm

Multiple Choice

Which of the following statements about water meters is correct?

• Internal meters do not require cross bonding for safety.

• Boundary meter boxes are only used for gas meters.

• Internal meters need to be cross bonded for safety.

• External meters are installed inside the building.

Multiple Choice

According to the Water Regulations, where should a stop valve be located inside a building?

• Below floor level, far from the point of entry

• Above floor level, as near as possible to the point of entry

• Outside the building, near the water main

• Anywhere inside the building

Multiple Select

Select all correct statements about stop valves and DOVs.

• Stop valves create a watertight seal by pushing a washer against a seating.

• If a stop valve jams, the entire valve must be replaced.

• DOVs must be installed above the incoming stop valve and at every low point in the system.

• DOVs use a spanner or key on the square drive to operate.

Multiple Choice

What are the two basic ways pressure can be created in plumbing systems?

• By heating water and increasing its temperature

• By fitting a pump or by the weight of water (the head)

• By increasing the pipe diameter

• By adding chemicals to the water

Multiple Choice

Which of the following factors can affect both pressure and flow in a plumbing system?

• Daily demand

• Location

• Blockages

• All of the above

Multiple Select

Select all the statements that are true about a direct cold water system.

• All cold water is supplied directly to each outlet at mains pressure.

• Old houses may have 20mm MDPE copper or lead mains.

• Precautions against backflow are not necessary.

• The system uses low pressure.

Multiple Choice

Which of the following is NOT a feature of a direct water system?

• Stored water is present

• Hot and cold water are directly off mains

• No water is stored at all

• Combination boiler is used

Multiple Select

Which of the following statements about indirect water systems is/are correct?

• Cold water is taken via the rising main to a storage cistern

• Most cold water outlets are fed with low pressure

• Kitchen sink is mains-fed

• All outlets receive potable water

Multiple Choice

According to the Water Regulations, what is the minimum capacity required for a cold water storage cistern if supplying both hot and cold water?

• 100-150 liters

• 230-250 liters

• 50-100 liters

• 150-200 liters

Multiple Choice

Which of the following is a benefit of rainwater harvesting for householders?

• It increases the use of mains water

• It reduces the pressure on mains water resources

• It eliminates the need for water storage cisterns

• It increases water wastage

Multiple Select

Which of the following are important requirements for installing rainwater and grey water systems?

• Prevent contamination of wholesome water

• Systems must be independent

• Pipework must be identified properly

• Systems must be connected to mains water

Multiple Choice

What are the minimum depth and diameter requirements for a communication pipe in a domestic cold water supply system?

• 750-1,350mm deep and 15mm diameter

• 500-1,000mm deep and 10mm diameter

• 1,500-2,000mm deep and 20mm diameter

• 250-500mm deep and 8mm diameter