Cold Water Mock 3 - Plumbing Exam Questions PDF

# COLD WATER MOCK 3 ## 1. The initials BSI stand for a) Building Specifications Institution b) British Standards Institution c) British Standards Instruction d) British Specifications Institution ## 2. The minimum depth for an underground cold water service pipe is a) 150 mm b) 450 mm c) 750 mm...

# COLD WATER MOCK 3 ## 1. The initials BSI stand for a) Building Specifications Institution b) British Standards Institution c) British Standards Instruction d) British Specifications Institution ## 2. The minimum depth for an underground cold water service pipe is a) 150 mm b) 450 mm c) 750 mm d) 1350 mm ## 3. Before turning off the water supply to a dwelling, the first action a plumber should take is to advise a) their supervisor b) the householder c) the Water Company d) the local Authority ## 4. Type 'A' fittings are also known as a) non-manipulative compression b) manipulative compression c) capillary d) push fit ## 5. Which one of the following types of cold water system, should be specified for a domestic dwelling, in an area where the water supply is poor during periods of peak demand? a) Direct b) Indirect c) Alternating d) Secondary ## 6. On a cistern supplying an indirect cold water system, the cold feed outlet to the domestic hot water cylinder should be a) higher than the cold distribution outlet b) lower than the cold distribution outlet c) level with the cold distribution outlet d) located at the base of the cistern. ## 7. The recommended clip spacing for a horizontal cold water service pipe in 15 mm copper is a) 1.0 m b) 1.2 m c) 1.5 m d) 1.8 m ## 8. Refer to Figure 1. The system component indicated by the British Standard symbol shown, is a a) supply stop valve b) float valve c) check valve d) draining valve. ## 9. The required distance between the water level and the invert level of the warning pipe, on a cold water storage cistern of less than 1000 litres capacity, is a) 10 mm b) 15 mm c) 20 mm d) 25 mm ## 10. The main advantage of an indirect cold water system, compared to a direct cold water system is that a) there is a reserve of water should the mains supply be turned off b) less pipework and fittings are required, thus reducing installation costs c) there is a wholesome supply of mains drinking water at all the outlets d) there is less chance of the pipework leaking due to reduced water pressure. ## 11. Refer to Figure 2. The type of fitting shown is a) a Type A non-manipulative compression fitting b) a Type B manipulative compression fitting c) integral solder ring capillary fitting d) end-feed solder capillary fitting ## 12. The purpose of a cold water distributing pipe in an indirect system of cold water supply is to a) provide a means of filling the cold water storage cistern from the mains b) prevent the cistern from overflowing should the float operated valve fail c) replace the water to the hot water storage cylinder as it's drawn off d) supply the water to the various cold water appliances within the system ## 13. Which of the following types of fittings would usually be installed on a supply pipe as it enters a domestic dwelling? a) Supply stop valve and check valve. b) Supply stop valve and drain valve. c) Service valve and drain valve. d) Supply stop valve and safety valve. ## 14. Which one of the following shut off devices would be an acceptable choice for a new WC cistern on a direct cold water system? a) Anti-scald valve. b) Pressure reducing valve. c) Equilibrium valve. d) Pressure flushing valve. ## 15. The Water Regulations specify two categories of test, one for rigid pipe installations, and one for systems containing a) lead b) LCS c) plastics d) copper ## 16. According to the Water Regulations, what percentage of the normal working pressure should the test pressure be, when testing rigid pipe installations? a) 10% below b) 50% below c) 50% above d) 75% above ## 17. Which one of the following can a plumber establish about a cold water system, by inspecting the cold water storage cistern and pipework arrangements? a) If it is direct or indirect. b) Exactly when it was installed. c) The number of appliances. d) The likely water pressure. ## 18. Before working on a shower pump, the plumber should a) isolate the shower pump from the electrical supply at the consumer unit, remove and retain the fuse, and check for safe isolation b) switch off the supply to the shower pump at the fused spur socket outlet, tape over the switch and carry on with the work c) isolate the shower pump from the electrical supply by turning off all the power at the mains, disconnect the shower pump and tape the wires up d) contact the power supply company to advise that the power is being turned off then isolate the supply at the consumer unit by removing the fuse. ## 19. Which one of the following should be turned off to isolate the float valve to the cold water storage cistern, on a new cold water system conforming to the Water Regulations? a) Supply stop valve. b) Supply pipe service valve. c) Water supplier's stop valve. d) Distributing service valve. ## 20. The main reason for placing a warning notice on the stop valve when temporarily decommissioning a system, is to a) satisfy the requirements of the Water Regulations b) prevent the possibility of back flow into the water main c) prevent the service from being accidentally re-activated d) satisfy the requirements of British Standard 6700. ## 21. Which one of the following is responsible for ensuring decommissioning records are provided to customers, when undertaking work on a multi-trade site? a) Plumber. b) Main Contractor. c) Water Company. d) Local Authority. ## 22. The most cost effective method of repairing a 'jammed' internal supply stop valve, is to a) replace the valve head gear b) isolate the supply, disconnect the valve and replace c) freeze the supply, disconnect the valve and replace d) call the water undertaker to turn off the main and replace. ## 23. Which one of the following is most likely to be included in a routine maintenance schedule for a cold water system in a dwelling? a) Checking the operation of taps and valves. b) A specification for the components being checked. c) Re-clipping all supply pipework from the mains. d) Stripping out any lead pipework and replacing it. ## 24. The most likely cause of noise in a cold water system would be due to the a) water pressure being too low b) system containing air bubbles c) water pressure being too high d) pipework requiring de-scaling. ## 25. It is important to notify the customer prior to the water supply being turned off during a lengthy maintenance operation a) because it is a statutory requirement of the Water Regulations b) so that the customer can store some water for drinking purposes c) because the customer could close a tap causing back siphonage d) as it is usually written as a clause in a maintenance contract. ## 26. Refer to Figure 3. The type of fitting shown is a a) globe tap b) quarter turn tap c) bib tap d) mixer tap ## 27. In which one of the following types of float valve, is it possible to replace the piston? a) Brass diaphragm. b) Brass portsmouth. c) Plastic diaphragm. d) Torbeck equilibrium. ## 28. During which one of the following maintenance operations would it be necessary to wear a dust mask? a) Lifting and carrying a pack of copper pipe to the job. b) Gaining access to a roof space to replace a CWSC. c) Working in a trench laying plastic service pipe. d) Chemical disinfection of a cold water system. ## 29. Guidance on the installation requirements for external water meters is covered by a) BS 1010 b) BS 1212 c) BS 6700 d) BS 8301 ## 30. Which one of the following areas of work is covered by the Water Regulations? a) New cold water system installations only. b) Maintenance of cold water installations. c) All types of work on mains cold water systems. d) Only systems providing drinking water. ## 31. The main purpose of a ceramic disc in a pillar tap is to a) control the flow of water b) prevent water hammer c) reduce maintenance costs d) prevent backflow risk. ## 32. If a cold water system in a dwelling is not thoroughly flushed out prior to hand over, the a) taps and valves may not perform to design specification b) local Water Company Inspector could prosecute c) water could become stagnant at the various appliances d) water could become contaminated due to back flow ## 33. Which one of the following documents would be the most appropriate to a maintenance contract for domestic dwellings? a) Bill of Quantities. b) Manufacturer's Instructions. c) Architect's Instructions. d) Variation order. ## 34. Only when a cold water pillar tap is opened does water appear from beneath the hand wheel. This problem can be rectified by a) re-packing the gland b) re-seating the tap c) re-washering the tap d) tightening the head gear. ## 35. Whilst working on a maintenance job, a plumber suspects that a communication pipe has burst. The most appropriate course of action would be to a) leave the burst to be found by the Water Undertaker later b) arrange for the local Water Undertaker to be advised c) turn off the ring main and repair the burst d) turn off the water in the dwelling. ## 36. The minimum height required for maintenance above a cistern of 1000 L or less is a) 150 mm b) 250 mm c) 350 mm d) 450 mm ## 37. A common cause of pin-holing in copper cold water supply pipework, is because the water a) is acidic b) is alkaline c) contains calcium d) contains chlorine. ## 38. The most probable cause of an intermittent supply to cold water taps fed from an indirect system, is a) an air lock in the communication pipe b) the mains pressure being set too high c) an air lock in the cylinder cold feed pipework d) an air lock in the distribution pipework. ## 39. When carrying out fault finding in an occupied dwelling, the first action should be to a) contact the appliance manufacturer for details b) obtain details from the householder about the fault c) contact the local Water Undertaker for advice d) obtain details from the original installer about the fault. ## 40. One common cause of air locks in an indirect supply to cold tap outlets is that horizontal sections of the a) distribution pipework is falling from the cistern b) supply pipework is falling to the cistern c) distribution pipework is rising from the cistern d) supply pipework is rising to the cistern. ## 41. Rigid screw-in type silencer tubes to float valves are now prohibited because they could a) become blocked and prevent the cistern from filling b) vibrate and cause excessive noise in the system c) induce air locks if submerged below the water level d) cause backflow of water and contaminate the supply. ## 42. Following the commissioning of a new cold water installation, the water flow from the float valve to the cold water storage cistern is very slow. The most likely reason is that the a) wrong chemicals were used for the flushing process, and the float valve has been damaged b) system was not flushed properly, and grit has accumulated at the float valve orifice c) float valve was inadvertently connected to an indirect cold water supply when first installed d) float valve was of a type designed for use on an indirect water supply, and not mains pressure. ## 43. The greatest potential risk of water stagnation in a dwelling is a) in cold water storage cisterns with a capacity of 115 L b) in horizontal distribution pipework over 28 mm diameter c) in linked cold water storage cisterns with unequal draw-offs from each d) where a cold water system has not been correctly disinfected. ## 44. Bonding wire should be secured to metal pipework using a) a temporary bond b) a junction box c) insulating tape d) an earth clip. ## 45. The purpose of applying temporary earth continuity bonding before removing a section of metallic cold water pipe, is to a) ensure that all exposed metallic parts of the system remain connected to earth while carrying out the work b) test and see if there are any faults on the electrical system before cutting into the pipe c) provide a method of isolating the electrical supply from the consumer unit to an earth clip d) safely isolate the system from the electricity supply circuit while undertaking the work.