4.1 FIGURE 4.1 below shows a tap - NSC Civil Technology Civil Services - Question 4 - 2024 - Paper 1
Question 4
4.1 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... show full transcript
Worked Solution & Example Answer:4.1 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, often referred to as a sensor tap or automatic tap.
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 save water by reducing wastage. It is designed to operate automatically without needing physical contact, making it ideal for hygienic applications.
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, kitchens, or other communal facilities.
Step 4
4.1.4 Draw an orthographic side view of a demand pillar tap.
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Answer
In the answer book, provide a neatly drawn orthographic side view of a demand pillar tap, showing the correct proportions and features.
Step 5
4.2.1 Identify A, B and C.
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A is identified as a P-trap, B is a 90° waste bend plain, 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, a waste junction, is to connect several pipes from different sources to a main sewer pipe, facilitating efficient drainage.
Step 8
4.2.4 Describe the function of fitting F.
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Fitting F is typically used to join two pipes at a 135° angle, allowing for an effective change in the direction of water flow.
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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Answer
In the answer book, illustrate a clear, two-dimensional T-waste junction that depicts the connection of one horizontal pipe to a vertical waste line.
Step 10
4.3.2 Name ONE diameter that the fitting mentioned in QUESTION 4.3.1 is available in.
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The T-waste junction is available in a diameter of either 40 mm or 50 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 T-waste junction can be installed under a double bowl sink or to connect a wash tub and a single sink.
Step 12
4.4.1 Identify the valve.
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The valve shown in FIGURE 4.4 is a full-way valve, also known as a 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 that opens or closes the water flow is referred to as 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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Turning the non-rising spindle clockwise will cause the tapering gate to move down, which will close the valve. This action will stop the flow of water or reduce the flow, depending on the extent of the turn.
Step 15
4.5.1 Show, by means of arrows, the direction of flow of water through the collector panels.
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In the answer sheet, draw arrows to illustrate that the water flows from the collector panels to the inlet and outlet.
Step 16
4.5.2 Draw the hot-water outlet to the house.
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Illustrate the hot-water outlet leading from the solar geyser to the house, ensuring clarity in the pathway.
Step 17
4.5.3 Label the inlet and outlet on the solar panel.
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Label the inlet as 'Inlet' and the outlet as 'Outlet' clearly on the diagram of the solar panel.
Step 18
4.6.1 Name the approved SANS symbols.
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The SANS symbol for a storage water heater (domestic type).
Step 19
4.6.2 Name the approved SANS symbols.
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The SANS symbol for an expansion control vessel.
Step 20
4.6.3 Name the approved SANS symbols.
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The SANS symbol for a mixer (thermostatically controlled).
Step 21
4.6.4 Name the approved SANS symbols.
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The SANS symbol for a water meter.
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 to ensure no blockages remain. Finally, disinfect the rods and allow them 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 any oil or debris, as this can impede its functionality.
Step 24
4.9 Why is zinc a highly reactive metal?
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Zinc is a highly reactive metal because it has a very weak atomic bond relative to other metals, which allows it to easily participate in chemical reactions.
Step 25
4.10 Explain TWO consequences if zinc is selectively removed from an alloy through dezincification.
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If zinc is selectively removed from an alloy due to dezincification, the material can weaken, leading to leaks or structural failures. Additionally, it can cause severe corrosion in the remaining metal.
Step 26
4.11 Name the colour of rust on galvanized parts when dezincification has taken place.
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The color of rust on galvanized parts after dezincification has occurred is typically white.
