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What is backflow risk in plumbing?

• The flow of water in the intended direction

• The reverse flow of water into the clean water supply

• The increase of water pressure in pipes

• The decrease of water temperature in pipes.

Backflow prevention methods are essential to ensure the safety of water supply. Which of the following is a common method used to prevent backflow?

• Installing a check valve

• Increasing water pressure

• Reducing water temperature

• Using larger pipes

What is backflow in plumbing?

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

• The increase of water pressure in the system.

• The regular flow of water in the correct direction.

• The heating of water in the system.

Back siphonage can occur when the pressure at the supply suddenly drops, causing a vacuum that sucks the water backwards. To prevent this, regulations outline the use of either a physical air gap or a ________.

• chemical solution

• mechanical device

• electrical pump

• manual valve

What is the description of Fluid category 1?

• Wholesome water supplied by a water undertaker

• Water whose aesthetic quality is impaired

• Fluid that represents a slight health hazard

• Fluid that represents a significant health hazard.

Fill in the blank: Any water that is not wholesome, potable drinking water is a ______ hazard.

• potential

• slight

• significant

• serious

Which appliance or system is associated with the potential contamination of human waste?

• Kitchen sink

• WC

• Bidet (over rim type)

• Combi boilers

The water in the heating system is often contaminated with dissolved metals, flux, and some form of chemical inhibitor. This is associated with which fluid category?

• Fluid category 1

• Fluid category 2

• Fluid category 3 or 4

• Fluid category 5

Fill in the blank: The potential contamination from a kitchen sink may contain animal remains from food preparation and is categorized under fluid category ____.

• A) 2

• B) 3

• C) 4

• D) 5

What is the minimum gap distance required for a WC according to the AUK 1 air gap type?

• 100mm

• 200mm

• 300mm

• 400mm