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Q1— Section header —
1.1State TWO characteristics of soft water. (2\
1.2State THREE purpose of base exchanger (3\
1.3List the FOUR STEP water treatment process for human consumption. (4\
1.4Wh at is the purpose of supply tanks and water towers in the reticulation process
1.5Name FOUR types of fire hydrant (4\
1.6State FOUR advantages of pressure reducing valves. (4\
1.7
Q2— Section header —
2.1Name the colour coding used to identify the valves with the following pressure:
2.1.1200 kPa
2.1.2
2.2Give TWO reasons why geysers are sometimes interconnected. (2\
2.3State THREE disadvantages of a water solar heating system as compared to an electric hot water heating system. (3\
2.4Draw a neat fully labelled diagrammatic sketch of an electric hot water heating installation with a horizontal geyser with a press
2.5Briefly describe the function of a pressure relief valve when it is installed with a pressure control va lve in a closed or unvented hot
2.6Give TWO reasons why back syphonage should not be allowed to occur when it is fitted on the cold water inlet to the geyser. (2\ [20] (1102205220
Q3— Section header —
3.1Name the TWO phases in which i nspection and testing of drains are done. (2\
3.2List FOUR advantages of using one pipe system in a building. (4\
3.3State FIVE regulations that discharge or ventilation pipe should conform to (5\
3.4Name THREE ci rcumstances that require a stub stack sanitary pipe work installation to be vented. (3\
3.5What is meant by the term one pipe system when referring to a sanitary pipe arrangement? (3\
3.6Describe method that could be used to protect the drain against damage. (2\
3.7The DI AGRAM SHEET (attached\ shows two pipe system of
3.7.1How many storeys does the building have? (1\
3.7.2How many 50 diameter pipes are utilised n the two pipe system? (1\
3.7.3
3.7.4State TWO disadvantages of two pipe system as shown i n the
3.8A drain pipe has an invert depth of 660 mm at a change of direction. Calculate the invert depth at the next change of direction if the distance between the two points is 13 m and the gradient of the drain is 1:40.
3.9Any drain installation must be provided with adequate access to the installation for the purpose of inspection, testing or internal cleaning. Name SIX likely points where access to pipes should be provided.
Q4— Section header —
4.1
4.2Name SIX types of flashing. (6\
4.3List FIVE types of metals that can be used to make flashing. (5\
4.4Name TWO places in a building where flashing is utilised (2\ [15]15
Q5— Section header —
5.1Calculate the maximum volume in cubic metre s that the tank can hold. (2\
5.2Calculate the mass of the water and the tank when the tank is full of water. The tank has a mass of 120 kg when it is empty. (4\
5.3Calculate t he area of the material in square metre s required to manufacture the tank. Do not make any allowances for seams or wire edges. (4\ [10] TOTAL: 10010