1) An RPZ valve should be installed with: a) an isolating valve upstream of the RPZ valve b) an isolating valve downstream of the RPZ valve c) an isolating valve both upstream and downstream of the RPZ valve d) no isolating valves 2) In which one of the following fluid categories does the domestic water from a washbasin fall? a) Category 1 b) Category 2 c) Category 3 d) Category 4 3) Under Regulation 5 of the Water Regulations, the water undertaker must be informed when which one of the following operations is carried out? a) Installation of a pump drawing more than 12 litres per minute b) Installation of a bidet without an ascending spray or flexible hose c) Installation of a bath with a capacity of fewer than 230 litres d) Installation of an RPZ valve to protect against a category 2 fluid 4) What is the component labelled A in the diagram below? a) Expansion cistern b) Break cistern c) Duplicate pumps d) Circulating pumps 5) The type of non-mechanical backflow prevention used on a domestic washbasin is known as: a) AUK 1 b) AUK 2 c) AUK 3 d) AUK 4 6) Which of the following items of legislation covers the requirements for the hydraulic testing of cold water pipe lines? a) Water Byelaws (England 2004) b) British Standards 5449 c) Water Supply (Water Fittings) Regulations 1999 d) Building Regulations Part G (P in Northern Ireland) 7) Which one of the following mechanical backflow prevention devices would be used when installing a replacement hose union bib tap? a) BA b) HUK1 c) HA d) HC 8) Which one of the following types of air gap provides suitable backflow protection for the taps in a washbasin installed in a hospital? a) AB air gap b) AUK 1 air gap c) AUK 2 air gap d) AUK 3 air gap 9) Service valves should be installed in which one of the following locations? a) On the cold feed to the primary circuit b) On the cold feed pipe from the cold water storage cistern c) Immediately after the internal stop valve d) Immediately after the external stop valve 10) Metallic cold water systems should be capable of withstanding an internal pressure of: a) the maximum potential operating pressure b) 1.5 times the maximum potential operating pressure c) 2 times the maximum potential operating pressure d) 3 times the maximum potential operating pressure 11) When preparing to disinfect a cold water system within an occupied block of flats, what should be placed at each outlet? a) A contact number for the plumber b) Warning notices c) Neutralising agents  d) Residual chlorine test kits 12) For an RPZ valve to meet its product specification it should be: a) provided with a drain pipe via a tundish b) installed without isolation valves c) sited close to an electrical supply d) only installed in a very low pressure supply 13) When flushing a domestic cold water system, which one of the following types of liquid should be used? a) Concentrated disinfectant b) Drinking water c) Diluted disinfectant d) Recycled water 14) Pressure testing of underground service pipework should take place: a) before backfilling has started b) after approval from the clerk of works c) after backfilling has been completed d) after approval from the water supplier 15) To eliminate the risk of contamination from undue warming, the cold water pipework must never be allowed to exceed what temperature? a) 20ºC b) 25ºC c) 30ºC  d) 35ºC 16) 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? a) High neck pillar tap b) Bib tap c) Bi-flow mixer tap  d) Mixer tap 17) A kitchen sink relies on what type of air gap between the spillover level and the tap outlet? a) AUK2 b) AUK3 c) AG  d) AA 18) What is the minimum head requirement for a gravity fed shower? a) 150mm b) 750mm c) 1,000mm  d) 1,150mm 19) A cold water storage cistern requires a wooden base for support. If the cistern base measures 1,000mm x 800mm, what (minimum) dimension should the wooden base be cut at? a) 1,000mm x 800mm b) 1,150mm x 950mm c) 1,300mm x 1,100mm d) 1,500mm x 1,300mm 20) After disinfection of a cold water system, it is found that the residual chlorine level is 35ppm. What actions should be taken? a) The system should be drained and flushed with drinking water b) The disinfection process should be repeated to ensure a residual chlorine level no less than 50ppm c) The system should be flushed with an inhibitor d) The disinfection process should be repeated to ensure a residual chlorine level no less than 70ppm.

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