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-sanitizing rod that protects the geyser.
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Answer
A thermostat is an electrical device that automatically regulates temperature, protecting the geyser from overheating.
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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A water diverter redirects cool water before it reaches the tap, guiding it into a rain-water tank for storage.
Step 3
4.1.3 The vacuum breaker should be installed within 1 metre from the geyser.
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The vacuum breaker is crucial to prevent back-siphonage, and should indeed be installed within 1 metre from the geyser.
Step 4
4.1.4 The temperature and pressure safety valve must be made of plastic or steel.
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The temperature and pressure safety valve must be made of copper or brass to withstand the high temperatures and pressures associated with hot water.
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 purpose of a drip tray of a geyser is to collect any leaks and prevent water damage, rather than balancing pressure.
Step 6
4.2.1 Identify the tap.
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The tap shown in FIGURE 4.2 is known as a demand pillar tap or metered tap.
Step 7
4.2.2 Explain the working principle of the tap.
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The demand pillar tap operates by allowing water to flow only when the top button is pressed, ensuring controlled usage of water.
Step 8
4.2.3 Draw an orthographic side view of an electronic tap.
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An electronic tap would have sensors to detect hand movement, allowing water to flow automatically. (A sketch would be included here.)
Step 9
4.3.1 Identify the coupling.
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The coupling shown in FIGURE 4.3 is known as 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 typically used with galvanized pipes.
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, shut off the water supply, remove the damaged section of the pipe, replace it with a new piece, and then tighten the coupling to secure the connection.
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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A centrifugal pump can be used to move water from a reservoir to an irrigation system.
Step 13
4.5 Explain TWO causes of a geyser dripping at the overflow.
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Causes of a geyser dripping at the overflow include a faulty pressure control valve and excessive heat build-up in the geyser.
Step 14
4.6 State ONE consequence of poorly installed hot-water pipes and loose jumpers in taps.
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One consequence of poorly installed hot-water pipes is the risk of leaks that can lead to water damage and increased utility bills.
Step 15
4.7 Name the approved hot-water SANS symbols and give the abbreviation for EACH symbol.
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4.8 Show, by means of a sketch, a T-waste junction 135° with an inspection eye.
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(A sketch would be included here showing a T-waste junction with an inspection eye.)
Step 17
4.9 Choose a description from COLUMN B that matches the item in COLUMN A. Write only the letter (A-H) next to the question numbers (4.9.1 to 4.9.5) in the ANSWER BOOK.
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4.9.1 C
4.9.2 A
4.9.3 G
4.9.4 F
4.9.5 E
Step 18
4.10 Differentiate between dezincification and galvanic corrosion processes.
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Dezincification is the selective leaching (removal) of Zinc from copper alloys, while galvanic corrosion is an electrochemical process that takes place between two different metals or alloys.
Step 19
4.11 Describe ONE way in which to prevent galvanic corrosion.
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Galvanic corrosion can be prevented by electrically insulating the two metals from each other.
