1) Which gas law predicts that as the pressure of gas in a sealed cylinder increase, at a constant temperature, its volume decreases? a) Avogadro's law. b) Boyle's law. c) Charles' law. d) Dalton's law. 2) On the Kelvin scale, at what temperature does water boil at sea level? a) I00K b) 273K c) 293K d) 373K 3) If the density of water is 998 kg/m3 and gravity is 9.81 m/s2, what is the resultant pressure at the outlet marked A in the diagram below? a) 44.58 kPa b) 50.91 kPa c) 53.00 kPa d) 58.86 kPa 4) What is the electrical current in a 230V circuit with a resistance of 57.5 ohms? a) 0.25 amps b) 4.00 amps c) 13.22 amps d) 287.50 amps 5) According to the Water Regulations (I999), what is the minimum recommended size of the cold water main entering a new dwelling? a) 15mm b) 20mm c) 22mm d) 25mm 6) What type of float-operated valve is shown in the image below? a) Part 1 b) Part 2. c) Part 3. d) Part 4 7) What is the minimum distance that the invert of an overflow pipe should be above the shut off level in a 2301 cold water storage cistern? a) 10mm b) 25mm c) 50mm d) 100mm 8) What is the minimum distance for A, in the diagram below, when the incoming water main is not insulated within the duct? a) 150mm b) 350mm c) 500mm d) 750mm 9) An AUK 3 air gap must be incorporated within the installation of which appliance? a) Cold water storage system. b) Domestic bidet. c) Kitchen sink. d) Wash hand basin. 10) What is the minimum diameter of the open vent pipe from an indirect hot water cylinder? a) 15mm b) 22mm c) 28mm d) 35mm 11) Which type of pump is most suitable to be installed into the secondary circulation of a domestic hot water system? a) Brass centrifugal pump. b) Brass rotary pump. c) Steel centrifugal pump. d) Steel rotary pump. 12) In the image below, which elements represent the pressure reducing valve and the temperature relief valve? a) D and I. b) C and I. c) C and G. d) D and G. 13) What document provides guidance on legal requirements in relation to domestic hot water systems? a) Approved Document F. b) Approved Document G. c) Approved Document H. d) Approved Document M. 14) What allows the flow rate of water through a multi boiler installation to be maintained without disturbance from any other heating circuit? a) Low loss header. b) Pressure differential valves. c) Pressurisation unit. d) Reverse return header 15) What is the effect of installing the pump in the position shown in the image below? a) The system will be under negative pressure and the open vent is under neutral pressure. b) The system will be under negative pressure, drawing air in from the open vent. c) The system will be under positive pressure allowing an improved system heat up rate. d) The system will be under positive pressure and will pump over the open vent. 16) What is the minimum requirement for zoning a wet central heating system in a new dwelling? a) A single zone is allowed if a three-port diverter valve is installed. b) if the system has a weather compensator installed. c) Two zones are required when the building floor area is less than 100m2. d) Two zones are required when the building floor area is greater than 150m2. 17) What would be the effect of a damaged diaphragm within the expansion vessel of a sealed heating system? a) Discharge of water from the pressure relief valve. b) Discolouration of water within the sealed system. c) Kettling with the heat exchanger during heat up. d) Release of air from the automatic air vent. 18) Where would you find the maintenance requirements for a condensing combination boiler? a) Approved document. b) British Standards. c) Manufacturer's instructions. d) Water Regulations. 19) What type of boiler incorporates a diverter valve and a plate heat exchanger? a) Back boiler. b) Combination boiler. c) Heat only boiler. d) System boiler. 20) When replacing a running outlet, a plumber notices that the connecting rainwater pipe is cracked. What action should be taken? a) Repair the pipe using silicone sealant. b) Replace the section of pipe. c) Inform the customer of the problem. d) Note the issue on the invoice for future consideration. 21) What is the negative effect of installing PVC guttering without allowing for linear expansion? a) Back-up. b) Blockages. c) Corrosion. d) Distortion. 22) What type of fixing normally used to attach gutter brackets to rafters? a) Steel twin thread screws. b) Zinc coated screws. c) Copper clout nails. d) Twin thread zinc nails. 23) What is the maximum length of a 50mm waste pipe connected to a soil stack before ventilation is required? a) lm b) 2m c) 4m d) 8m 24) What is used to create a seal between the siphon and the body of a WC flushing cistern? a) Putty. b) A rubber washer. c) Fibre cement d) A circlip washer. 25) What is the recommended minimum distance a soakaway should be sited away from a building? a) 3m b) 5m c) 7m d) 9m

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