FIGURE 4.1 below shows a tap - NSC Civil Technology Civil Services - Question 4 - 2024 - Paper 1
Question 4
FIGURE 4.1 below shows a tap.
4.1.1 Identify the tap.
4.1.2 Explain the purpose of this type of tap.
4.1.3 Name ONE place where you will find this tap.
4.1.4 Dra... show full transcript
Worked Solution & Example Answer:FIGURE 4.1 below shows a tap - NSC Civil Technology Civil Services - Question 4 - 2024 - Paper 1
Step 1
4.1.1 Identify the tap.
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Answer
The tap shown in FIGURE 4.1 is an electronic tap or sensor tap, commonly used for touchless operation.
Step 2
4.1.2 Explain the purpose of this type of tap.
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The purpose of this type of tap is to conserve water by minimizing wastage, allowing for hands-free operation, which is especially useful in public restrooms, kitchens, and bathrooms.
Step 3
4.1.3 Name ONE place where you will find this tap.
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This type of tap can typically be found in public bathrooms, particularly in commercial settings.
Step 4
4.1.4 Draw an orthographic side view of a demand pillar tap.
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The orthographic side view should depict a pillar tap with a cylindrical body, a tapered spout extending downwards, and a handle for manual operation.
Step 5
4.2.1 Identify A, B and C.
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A is a P-trap, B is a 90° waste bend, and C is a waste pipe.
Step 6
4.2.2 Name the diameter for D.
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The diameter for D is 110 mm.
Step 7
4.2.3 Describe the function of E.
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The function of E is to connect sewer pipes at an angle of 135°, allowing for a smooth transition between different pipe sections.
Step 8
4.2.4 Describe the function of fitting F.
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The function of fitting F is to serve as a junction for waste flow, connecting the waste pipe to the main sewer line.
Step 9
4.3.1 Draw in the ANSWER BOOK a neat two-dimensional sketch of a plain T-waste junction.
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The sketch should clearly illustrate a T-waste junction, depicting three pipe connections: one straight pipe (main sewer) and two branches (waste connections).
Step 10
4.3.2 Name ONE diameter that the fitting mentioned in QUESTION 4.3.1 is available in.
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One diameter available for the fitting is 40 mm.
Step 11
4.3.3 Name ONE specific place where you will install the fitting mentioned in QUESTION 4.3.1 in a drainage system.
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The fitting can be installed under a double bowl sink.
Step 12
4.4.1 Identify the valve.
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The valve shown in FIGURE 4.4 is a full-way or gate valve.
Step 13
4.4.2 What is the handle called that opens or closes the water flow?
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The handle is called a wheel or hand wheel.
Step 14
4.4.3 Explain TWO consequences that will happen to the tapering gate if the non-rising spindle is turned clockwise.
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If the non-rising spindle is turned clockwise, the tapering gate will move down, potentially closing the valve and completely stopping the flow of water.
Step 15
4.5.1 Show, by means of arrows, the direction of flow of water through the collector panels.
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Arrows should indicate that water flows from the inlet, moves through the collector panels, and exits through the outlet as hot water.
Step 16
4.5.2 Draw the hot-water outlet to the house.
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The drawing should depict a pipe leading from the outlet of the solar geyser to the house.
Step 17
4.5.3 Label the inlet and outlet on the solar panel.
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Label the inlet and outlet clearly on the solar panel diagram to indicate water entry and exit points.
Step 18
4.6.1
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The SANS symbol for a storage water heater (domestic type) is represented in the approved symbols.
Step 19
4.6.2
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The SANS symbol for an expansion control vessel is illustrated.
Step 20
4.6.3
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The SANS symbol for a mixer (thermostatically controlled) is depicted.
Step 21
4.6.4
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The SANS symbol for a water meter is shown.
Step 22
4.7 Explain how to clean the drain-cleaning rods after it was used to unclog a drain.
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To clean the drain-cleaning rods, first, hose them down to remove debris. Next, wash them thoroughly with water and disinfect them. Finally, allow the rods to dry completely.
Step 23
4.8 When do you need to clean the bearing bracket of a centrifugal pump?
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You need to clean the bearing bracket of a centrifugal pump when it contains oil, to ensure optimal functioning.
Step 24
4.9 Why is zinc a highly reactive metal?
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Zinc is highly reactive due to its atomic structure, which makes it prone to oxidation when exposed to environmental elements.
Step 25
4.10 Explain TWO consequences if zinc is selectively removed from an alloy through dezincification.
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The removal of zinc can cause the alloy to lose strength and structural integrity, leading to potential leaks or failures in the components it is used in.
Step 26
4.11 Name the colour of rust on galvanized parts when dezincification has taken place.
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The colour of rust on galvanized parts after dezincification typically appears white.
