Unit 206: Outcome 3 (Part 2)

Multiple Choice

Why is it important to maintain efficiency in domestic hot water plumbing systems?

• To reduce energy consumption and costs

• To comply with building regulations

• To ensure hot water is available on demand

• All of the above

Multiple Choice

According to BS6700, what is the maximum length of pipe before it becomes a dead leg for pipes over 28mm in diameter?

• 3m

• 8m

• 12m

• 5m

Multiple Select

Which of the following are consequences of having an active dead leg in a hot water system?

• Waste of water

• Stagnant water

• Waste of heated water left in pipe

• Bacterial growth

Open Ended

Explain the difference between an active dead leg and a passive dead leg in a plumbing system.

Multiple Select

What are two methods to overcome a dead leg in a hot water system?

• Install localised hot water

• Use secondary circulation

• Increase pipe diameter

• Reduce water temperature

Multiple Choice

What is the purpose of using a trace heating element on a hot water pipe in vulnerable situations?

• To prevent freezing by maintaining temperature

• To increase water pressure

• To reduce pipe diameter

• To improve water taste

Multiple Select

Which of the following are reasons for protecting pipes as mentioned in the slides?

• Frost/freezing

• Heat loss

• Damage

• Improved water taste

Open Ended

Why is it important to insulate hot water pipes in places such as loft areas or unheated garages?

Multiple Choice

Which fluid category requires an RPZ valve for protection?

• Category 1

• Category 2

• Category 4

• Category 5

Multiple Choice

Which of the following is NOT a method to prevent contamination of wholesome water within a property according to Water Regulations?

• Using non-approved material

• Stopping back flow

• Stopping back pressure

• Avoiding cross connections

Multiple Select

Which of the following statements about backflow and back pressure is/are correct?

• Backflow is the flowing of water in the wrong direction due to loss of system pressure.

• Back pressure is another term for backflow.

• Backflow can occur if the mains cold water is shut off for repairs.

• Backflow only occurs in hot water systems.

Multiple Select

Which of the following are examples of cross connections that should be avoided to prevent contamination?

• Connection between a sealed central heating system and the mains

• Connection between grey water harvesting and the mains

• Connection between a garden hose and a tap

• Connection between a rainwater tank and the mains

Multiple Choice

Which type of air gap is used in a WC cistern to separate the spill over level and the exit of the overflow?

• AUK1 air gap

• AUK2 air gap

• AUK3 air gap

• AG air gap

Multiple Select

Which appliances require an AUK2 air gap to separate the spill over level and the outlet point of the tap?

• Basin

• Bath

• Bidet

• Kitchen sink

Multiple Choice

What risk is posed by connecting an over rim bidet with a flexible shower hose to a combination boiler?

• Risk of contamination

• Risk of flooding

• Risk of low water pressure

• Risk of pipe corrosion

Multiple Choice

What are two main ways to minimize heat loss in domestic hot water plumbing systems?

• Using insulation on the cylinder and pipework

• Increasing the length of the pipework

• Using thinner pipes

• Reducing the number of outlets