Cold Water Mock 2 PDF - Plumbing Questions

# COLD WATER MOCK 2 ## 1. The legal requirements for the installation of cold water services are stated in the * a) British Standards * b) Building Regulations * c) Water Regulations * d) Construction Regulations. ## 2. To establish whether a cold water supply to a dwelling is adequate to feed a...

# COLD WATER MOCK 2 ## 1. The legal requirements for the installation of cold water services are stated in the * a) British Standards * b) Building Regulations * c) Water Regulations * d) Construction Regulations. ## 2. To establish whether a cold water supply to a dwelling is adequate to feed all the plumbing appliances, the best item of equipment to use is a * a) water meter * b) manometer * c) flow meter * d) air test gauge. ## 3. A plumbing operative identifies that a low pressure cold water system does not provide a suitable flow rate to an electric shower, supplied by the plumbing company, that is to be installed. Who should be the first point of contact? * a) Water company. * b) Local authority. * c) Customer. * d) Supervisor. ## 4. Which one of the following is approved for use on underground service pipes? * a) Solder fittings with lead/tin solder. * b) Push fit plastic fittings. * c) Type 'B' compression fittings. * d) Type 'A' compression fittings. ## 5. The Water Regulations state that the minimum permissible distance from the external wall of a dwelling, to where an uninsulated service pipe enters the inside of the building, is * a) 150 mm * b) 250 mm * c) 550 mm * d) 750 mm. ## 6. The last isolation valve on a supply pipe to a cold water storage cistern is the * a) float operated valve * b) draining valve * c) servicing valve * d) supply stop valve. ## 7. The recommended clip spacing for a vertical cold water service pipe in 15 mm copper is * a) 1.0 m * b) 1.3 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. In addition to a warning pipe, an overflow pipe is required on cisterns of more than what capacity? * a) 115 litres. * b) 230 litres. * c) 1000 litres. * d) 1250 litres. ## 10. The main advantage of a direct system of cold water, compared to an indirect system of cold water, is that * a) there is much less chance of noise in the system * b) it has cheaper materials and installation costs * c) the pressure of the hot water is improved * d) the pressure to the float valves is reduced. ## 11. Which one of the following grades of copper pipework is permissible for use on underground service pipework? * a) R220 Micro-bore. * b) R250. * c) R220. * d) R290. ## 12. A distributing pipe in a cold water system * a) connects between the outlet of a cistern and a number of appliances * b) connects between the inlet of a cistern and a number of appliances * c) is supplied at mains pressure * d) is only used on private supplies. ## 13. The underground pipe that connects the water undertaker's main to the boundary stop valve is called the * a) rising main pipe * b) communication pipe * c) service pipe * d) cold feed pipe. ## 14. The correct method for making a joint between a float operated valve and the wall of a plastic cold water storage cistern, is to use * a) an oil based jointing compound with a stiffener plate * b) fabricated lead washers * c) a non-toxic silicon compound * d) plastic jointing washers with a stiffener plate. ## 15. The hydraulic soundness test specification on cold water supply and distributing pipes can be found in * a) the Water Regulations * b) the Building Regulations * c) BS 6281 * d) CP 312 Part 1. ## 16. When carrying out soundness testing, an interim test should * a) include a visual inspection of all components, pipework and fittings prior to starting the hydraulic test * b) be in the form of a pre-test using inert argon, so water damage would not occur should there be any leaks * c) be applied to every pipeline after completion of a particular section, particularly where the work will be covered * d) be carried out by a representative of the Water Company to ensure that the installation complies with Regulations. ## 17. On an indirect cold water system, the best method of isolating the supply to the cold tap on the bath, would be to turn off the * a) supply stop valve * b) cold distributing pipe service valve * c) cold feed service valve * d) service valve to the storage cistern. ## 18. Whilst removing pipework to a cold water storage cistern, a plumbing operative notices some damaged electrical cabling. The correct course of action is to * a) replace the defective cable immediately * b) phone an electrician to repair the cable * c) ignore it, as it is not their responsibility * d) isolate the circuit and report the fault to the supervisor. ## 19. Before work commences on moving an instantaneous shower to a new position, the plumber should * a) isolate the shower from the electrical supply using the pull switch in the bathroom, test that the shower is not live using a multi meter, then disconnect the cable * b) isolate the shower from the electrical supply by turning off all the power at the mains, disconnect the shower, tape the wires up, and turn the power back on * c) contact the power supply company and advise that the power is being turned off, then isolate the supply at the consumer unit by removing and retain the fuse * d) isolate the shower from the electrical supply at the consumer unit by removing and retaining the fuse, and test for safe isolation. ## 20. A cold water system is to be permanently de-commissioned. The best method of ensuring that the water supply can not be re-used is to turn off the * a) water supplier's stop valve located outside * b) supply stop valve and remove the crutch head * c) supply stop valve and cap off the supply pipe * d) supply stop valve and label 'do not turn on'. ## 21. It is advisable to place a warning notice on the supply stop valve when carrying out temporary system decommissioning, in a domestic dwelling * a) when re-washering a float valve fed via a service valve * b) when the supply stop valve is being maintained * c) where the supply may be off for some time * d) in all circumstances whatever the type of work. ## 22. Which one of the following would be the most appropriate to receive decommissioning records, for work carried out in a dwelling? * a) Customer. * b) Water undertaker. * c) Local Authority. * d) Architect. ## 23. Information on the maintenance requirements of an instantaneous shower can be obtained from the * a) installation materials specification * b) Water Regulations Guidelines * c) manufacturer's technical data * d) British Standard 6700: 1997. ## 24. Copper supply pipe is most at risk from corrosion when * a) jointed using brass fittings containing zinc * b) installed in roof spaces without correct insulation * c) clipped directly to a plasterboard stud partition * d) connected to polythene pipework below ground. ## 25. Before starting work on a lengthy maintenance job, a plumber's first action should be to * a) turn off the supply and tell the customer not to use the taps * b) advise the customer that the supply is going to be to be turned off * c) turn off the supply and drain down all the system pipework * d) make sure the system pipework has been thoroughly flushed out. ## 26. Refer to Figure 2 which shows an equilibrium float valve. The metering pin is indicated by the number * a) 1 * b) 2 * c) 3 * d) 4. ## 27. In which one of the following cold water components, can the valve seating be repaired? * a) Diaphragm float valve. * b) Spherical service valve. * c) Fullway gate valve. * d) Sink pillar tap. ## 28. Safe access equipment would usually need to be available when working on a * a) cold water storage cistern * b) water meter located externally * c) stop valve inside a kitchen unit * d) mixer valve connected to a bidet. ## 29. The performance specification for a shower pump can be found in the * a) job specification for the installation * b) current Building Regulations * c) current Water Regulations * d) manufacturer's technical literature. ## 30. British Standard 6700 provides specific guidance on the design, installation, testing and maintenance of * a) cold water services * b) condensing boilers * c) domestic gas supply * d) drainage systems. ## 31. The purpose of a packing gland on a stop valve is to * a) prevent the crutch head from being over tightened * b) provide a method of keeping the spindle lubricated * c) provide a seal between the spindle and the head gear * d) ensure that the stop valve cannot be tampered with. ## 32. Excessive water pressures in a cold water system can be controlled by fitting a pressure * a) amplifier * b) pumping kit * c) reducing valve * d) venture device. ## 33. A plumbing company has a contract to maintain the systems on a housing estate. Which one of the following documents would state the type of work required to be undertaken? * a) Materials schedule. * b) Maintenance specification. *c) Maintenance schedule. * d) Bill of Quantities. ## 34. The most likely cause of low water pressure on the cold water supply, to a kitchen sink tap in a direct system, is that * a) the cold water storage cistern is empty * b) a cold feed service valve is closed or faulty * c) there is a burst on the cold water supply * d) the service valve to the cistern float valve is closed. ## 35. Whilst working on a maintenance job, a plumber suspects that an underground supply pipe has burst. The most appropriate course of action would be to * a) locate the burst and repair it * b) advise the Local Water Company * c) advise the Local Authority Inspector * d) report the matter to the customer. ## 36. There is no supply to a hot water tap on the bath when it is opened. The cold water system is indirect. The most likely cause of the problem is a fault on the * a) primary flow * b) filling loop to the boiler * c) cold feed pipework * d) open vent pipe. ## 37. The water from the shower head of a low pressure thermostatic mixer valve is constantly cold. The most likely cause of the problem is that the * a) cold connection to the shower has been made directly to the supply pipe * b) cold distributing pipe is locked with air at a high point in the pipework * c) cold water storage cistern is not high enough above the mixer valve outlet * d) service valve on the cold distribution pipe to the shower is closed. ## 38. Other than a leaking pipe or fitting, the most probable cause of excessive moisture on exposed cold water copper pipework within a dwelling is * a) capillary action * b) condensation * c) electrolysis * d) evaporation. ## 39. A metal plate is required at the point where the float valve tail penetrates the wall of a plastic cold water storage cistern in order to * a) ensure a water tight joint is possible * b) increase stress on the float valve arm * c) prevent the cistern wall from vibrating * d) provide a horizontal connection to the cistern. ## 40. Which one of the following describes best practice when fitting a replacement cold water storage cistern to an indirect system? * a) Outlet connections from the cistern must be made at low level (preferably bottom entry) to avoid contamination. * b) The minimum capacity for a cold water storage cistern supplying an indirect system to a dwelling must be 1000 litres. * c) A float operated valve installed in a cold water storage cistern must always be located opposite to the warning pipe. * d) A service valve to a distributing pipe must only be fitted when supplying a thermostatic mixing valve to a shower. ## 41. Certain types of approved float valve may be fitted with a flexible type of silencer tube, in order to * a) reduce the amount of system noise from the float valve when the cistern is filling * b) help the environment by reducing the amount of material used during manufacture * c) prevent backflow of water and subsequent contamination of the water supply * d) avoid disturbing the sediment at the bottom of the cistern due to the velocity of the Water. ## 42. Which one of the following types of fitting would usually be provided on the cold feed pipe to a hot water storage vessel in a domestic dwelling? * a) Fullway gate valve. * b) Screwdown stop valve. * c) Spherical plug valve. * d) Lockshield gate valve. ## 43. To help prevent the risk of water stagnation in a linked cold water storage cistern arrangement * a) the level of the water in the cistern should be at least 1 m above the highest outlet * b) the pipework arrangement must ensure equal draw-off from each linked cistern * c) distributing pipes must be a minimum of 28 mm in order to improve flow rates * d) a disinfecting agent should be added to the cisterns when filling the system. ## 44. Prior to carrying out any maintenance work on an electric instantaneous hot water heater, the plumber should * a) disconnect the supply pipe near to the appliance and cap it off * b) contact the water undertaker to isolate the section of the water main * c) disconnect the power supply cable to the water heater at the consumer unit * d) isolate the appliance at the consumer unit, remove the fuse and keep it safe. ## 45. When working on an existing system, temporary earth continuity bonding should be used when removing * a) a spurred fused outlet * b) a section of copper pipe * c) an electrical appliance * d) a section of polythene pipe.