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SmartScreen Level 2 Diploma in Plumbing Studies Unit 205 Sample questions Unit 205: Cold water systems Sample questions 1. When installing a new indirect cold water system, which of the following should happen, according to the Water Regulations? a. One tap (normally kitchen sink) drawn directly from the supply pipe b. One tap (normally kitchen sink) should have a dedicated distribution pipe from the storage cistern c. Mixer taps will require double check valves d. Mixer taps should never be installed due to the pressure differences. 2. According to BS6700 and the Water Regulations, a drain off valve should be installed: a. At every draw off point b. At every high point in the system c. At every low point in the system d. Above the cold water storage cistern. 3. Pin holing in copper pipework is commonly caused by: a. Hard water b. Acidic water c. Alkaline water d. Pure water. 4. While installing pipework in a property, you are called off site to another job. What would be the correct course of action with any open-ended pipework? a. Place a warning label on every open end b. Cap off with a push fit fitting c. Warn the customer not to interfere with any pipework d. Be as quick as you can to return. 5. One of the major problems when leaving a dead leg in a cold water pipe is: a. Electrolytic corrosion b. Pitting of pipework c. Reduction in water flow d. Possible bacterial growth. 6. The use of WRAS approved fittings when installing cold water pipework is: a. A legal requirement b. To be corrosion resistant c. To avoid contamination d. All of the above. 7. On the completion of a new cold water installation, the system has been proven sound. What would the next course of action be? a. Visual inspection with the customer b. Flush the pipework out then hand over to the customer c. Prepare the benchmark certificate d. Hand over to the customer. © 2013 City and Guilds of London Institute. All rights reserved. Page 1 of 3 www.SmartScreen.co.uk SmartScreen Level 2 Diploma in Plumbing Studies Unit 205 Sample questions 8. What is the most cost effective way to repair a stop valve that has the head gear jammed open? a. Replace the head gear only b. Replace the whole valve c. Leave in position, and install a new stop valve upstream d. Repack the glands around the spindle. 9. When decommissioning a system, the correct procedure is to: a. Turn off the water quickly to save any wasted water b. Drain the system down then inform the customer c. Inform the customer first then drain the system d. Use a pump to drain down quickly. 10.What is this item? a. Fullway gate valve b. Drain off valve c. Stop valve d. Spherical ball valve. 11.What type of valve is shown in this diagram? a. Spherical ball valve b. Fullway gate valve c. Stop valve d. Drain off valve. 12.When installing a new water service pipe to a property, it should normally be buried between what depths? a. 135mm to 1,750mm b. 350mm to 750mm c. 1,350mm to 1,750mm d. 750mm to 1,350mm. 13.Identify item C in the diagram. a. Warning pipe b. Grommet for open vent c. Screened vent d. Inspection flap. 14.Which of the following materials is not allowed to be installed on new cold water systems? a. Copper b. Stainless steel c. MDPE d. Lead. 15.What type of valve is designed to shut off the supply of water in a cistern at a predetermined level? a. Stop valve b. Fullway gate valve c. Float operated valve d. Isolation valve. © 2013 City and Guilds of London Institute. All rights reserved. Page 2 of 3 www.SmartScreen.co.uk SmartScreen Level 2 Diploma in Plumbing Studies Unit 205 Sample questions 16. The fluid category that offers a slight health risk to a customer is: a. 1 b. 2 c. 3 d. 4. 17.The correct back flow protection device that would be installed prior to a shower mixer valve would be: a. Single check valve b. Double check valve c. RPZ valve d. Type AG air gap. 18.To protect category 1 water from category 3 water, what would need to be installed, according to the Water Regulations? a. Single check valve b. Double check valve c. RPZ valve d. Type AG air gap. 19.What would this item be used to test? a. Pressure b. Category of water c. Flow rate d. pH valve 20.If a customer’s tap is dripping, what tool can be used to correct the situation? a. Club hammer b. Stillsons c. Bradawl d. Re-seating tool. © 2013 City and Guilds of London Institute. All rights reserved. Page 3 of 3 www.SmartScreen.co.uk