GMJ 9189 Phase 2 cold water MCQ

A kitchen sink relies on what type of air gap between the spillover level and the tap outlet?

• AUK2

• AUK3

• AG

• AA

To eliminate the risk of contamination from undue warming, the cold water pipework must never be allowed to exceed what temperature?

• 20ºC

• 25ºC

• 30ºC

• 35ºC

In which one of the following fluid categories does the domestic waste water from a washbasin fall?

• Category 1

• Category 2

• Category 3

• Category 4

The type of non-mechanical backflow prevention used on a domestic washbasin is known as:

• AUK 1

• AUK 2

• AUK 3

• AUK 4

Which one of the following types of taps typically requires a single check valve to protect against backflow from cross-connection with fluid category 2 water?

• High neck pillar tap

• Bib tap

• Bi-flow mixer tap

• Mixer tap

What is the minimum head requirement for a gravity fed shower?

• 150mm

• 750mm

• 1,000mm

• 1,150mm

When preparing to disinfect a cold water system within an occupied block of flats, what should be placed at each outlet?

• A contact number for the plumber

• Warning notices

• Neutralising agents

• Residual chlorine test kits

An RPZ valve should be installed with:

• an isolating valve upstream of the RPZ valve

• an isolating valve downstream of the RPZ valve

• an isolating valve both upstream and downstream of the RPZ valve

• no isolating valves

After disinfection of a cold water system, it is found that the residual chlorine level is 35ppm. What actions should be taken?

• The system should be drained and flushed with drinking water

• The disinfection process should be repeated to ensure a residual chlorine level no less than 50ppm

• The system should be flushed with an inhibitor

• The disinfection process should be repeated to ensure a residual chlorine level no less than 70ppm

Which of the following items of legislation covers the requirements for the hydraulic testing of cold water pipe lines?

• Water Byelaws (England 2004)

• British Standards 5449

• Water Supply (Water Fittings) Regulations 1999

• Building Regulations Part G (P in Northern Ireland)