4.1 Change the underlined words in the following to make the statements TRUE - NSC Civil Technology Civil Services - Question 4 - 2023 - Paper 1
Question 4
4.1 Change the underlined words in the following to make the statements TRUE. Write the appropriate word(s) next to the question numbers (4.1.1 to 4.1.5) in the ANSW... show full transcript
Worked Solution & Example Answer:4.1 Change the underlined words in the following to make the statements TRUE - NSC Civil Technology Civil Services - Question 4 - 2023 - Paper 1
Step 1
4.1.1 A thermostat is a self-sensing rod that protects the geyser.
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Answer
A suitable term to replace 'self-sensing rod' is 'anode'. The anode serves to protect the geyser from corrosion.
Step 2
4.1.2 The water meter redirects cool water, before it reaches the tap, to a rain-water tank.
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Answer
The correct term is 'red water diverter'. This device is designed to redirect excess water efficiently.
Step 3
4.1.3 The vacuum breaker should be installed within 1 metre from the geyser.
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Answer
The appropriate term is 'electric isolator switch'. This switch disconnects power for safety.
Step 4
4.1.4 The temperature and pressure safety valve must be made of plastic or steel.
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Answer
The proper material for the valve is 'Copper/Brass', which withstands the operating pressure.
Step 5
4.1.5 The purpose of a drip tray of a geyser is to balance the pressure of the cold- and hot-water supply.
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The primary role of a drip tray is to act as a form of pressure control valve/PCV.
Step 6
4.2.1 Identify the tap.
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Answer
The tap shown in FIGURE 4.2 is a demand pillar tap.
Step 7
4.2.2 Explain the working principle of the tap.
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Answer
The demand pillar tap allows water to flow only when the top button is pressed. This mechanism ensures water conservation.
Step 8
4.2.3 Draw an orthographic side view of an electronic tap.
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Answer
An orthographic side view of an electronic tap features a streamlined body with sensors and a water outlet.
Step 9
4.3.1 Identify the coupling.
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Answer
The coupling shown in FIGURE 4.3 is a Johnson coupling.
Step 10
4.3.2 Name the type of pipe that this coupling is used for.
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This coupling is used for galvanized pipes, which are commonly used in plumbing.
Step 11
4.3.3 Explain how you will use this coupling to fix a leaking pipe up to the tightening of the coupling.
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To fix a leaking pipe using this coupling: 1. Shut off the water supply. 2. Cut and remove the damaged section of the pipe. 3. Replace it with a new piece. 4. Use the coupling to tightly secure the two ends.
Step 12
4.4 Name a machine that can be used to move water from a reservoir to an irrigation system.
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Answer
A centrifugal pump is commonly used for this purpose, efficiently transporting water.
Step 13
4.5 Explain TWO causes of a geyser dripping at the overflow.
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Answer
Two common causes include: 1. A faulty pressure-control valve allowing excessive pressure. 2. A defective thermostat leading to excessive heat.
Step 14
4.6 State ONE consequence of poorly installed hot-water pipes and loose jumpers in taps.
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Answer
One consequence of this issue could be water hammering, leading to pipe damage and noise.
Step 15
4.7 Name the approved hot-water SANS symbols and give the abbreviation for EACH symbol.
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4.10 Differentiate between dezincification and galvanic corrosion processes.
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Dezincification is the selective leaching of zinc from copper alloys, while galvanic corrosion involves electrochemical processes between dissimilar metals.
Step 19
4.11 Describe ONE way in which to prevent galvanic corrosion.
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Galvanic corrosion can be prevented by applying an antioxidant paste to inhibit the electrochemical reaction.
