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-scartificing rod that protects the geyser.
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Answer
Thermostat is a self-regulating device that maintains the desired temperature in the geyser by regulating the heating element.
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
Water diverter is a device that redirects the flow of water, ensuring that surplus water is directed to a rainwater harvesting system.
Step 3
4.1.3 The vacuum breaker should be installed within 1 metre from the geyser.
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The vacuum breaker functions to prevent backflow and must be placed close to the geyser for optimal performance.
Step 4
4.1.4 The temperature and pressure safety valve must be made of plastic or steel.
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The safety valve should be constructed from copper or brass to ensure durability and resistance against corrosion.
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 drip tray collects excess water and prevents overflow, maintaining the balance in the geyser's pressure system.
Step 6
4.2.1 Identify the tap.
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The tap shown in Figure 4.2 is identified as a demand pillar tap or metered tap.
Step 7
4.2.2 Explain the working principle of the tap.
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Answer
The working principle of a demand pillar tap allows water to flow only when the top button is pressed. It maintains a consistent flow for a regulated duration post-press.
Step 8
4.2.3 Draw an orthographic side view of an electronic tap.
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An electronic tap consists of an integrated sensor for activation, allowing hands-free operation.
Step 9
4.3.1 Identify the coupling.
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Answer
The coupling shown in Figure 4.3 is identified as a Johnson coupling.
Step 10
4.3.2 Name the type of pipe that this coupling is used for.
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The coupling is typically used for galvanized pipe.
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 a Johnson coupling, first shut off the water supply. Then, cut and remove the damaged section of the pipe, replace it with a new piece, and tighten the Johnson coupling over the joint to secure the pipes.
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 is used to efficiently transfer 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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Answer
A faulty pressure-control valve can lead to excessive water pressure, resulting in overflow.
A faulty thermostat may cause overheating, leading to excess pressure release from 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 can be water wastage, which could lead to increased utility bills and environmental concerns.
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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Answer
A T-waste junction is shaped in a T formation with an inclining branch for drainage, illustrated with an inspection eye for accessing the pipe.
Step 17
4.9.1 90° bend with inspection eye.
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Answer
C
Step 18
4.9.2 P-trap.
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A
Step 19
4.9.3 Stopcock.
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Answer
G
Step 20
4.9.4 Ball valve.
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Answer
F
Step 21
4.9.5 Bend 135° plain.
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Answer
E
Step 22
4.10 Differentiate between dezincification and galvanic corrosion processes.
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Answer
Dezincification is the selective leaching of Zinc from copper alloys, whereas galvanic corrosion is an electrochemical process occurring between two different metals or alloys.
Step 23
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 dissimilar metals from contact, thereby eliminating the electrochemical reaction.
