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 for the underlined word is 'Anode'.
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 term 'Red water diverter' should be used.
Step 3
4.1.3 The vacuum breaker should be installed within 1 metre from the geyser.
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Answer
The correct term is 'Electric isolator switch/Isolator'.
Step 4
4.1.4 The temperature and pressure safety valve must be made of plastic or steel.
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Answer
The appropriate materials are 'Copper/Brass'.
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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Answer
The correct term is 'Pressure control valve/PCV'.
Step 6
4.2.1 Identify the tap.
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Answer
The tap is identified as a 'Demand pillar tap/Metered tap'.
Step 7
4.2.2 Explain the working principle of the tap.
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Answer
This type of tap works by allowing water to flow only when the top button is pressed, limiting water flow to conserve resources.
Step 8
4.2.3 Draw an orthographic side view of an electronic tap.
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Answer
An orthographic side view would show the mechanism where the main body of the tap is connected to the water supply, with electrical components attached for activation.
Step 9
4.3.1 Identify the coupling.
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Answer
The coupling 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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Answer
This coupling is 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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Answer
To fix the leaking pipe, first shut off the water supply, then cut and remove the damaged part of the pipe. After that, replace it with a new piece and use the coupling to securely join the two pipe ends, ensuring a tight fit.
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' can effectively move water for irrigation.
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 result in excess pressure, causing overflow.
A faulty thermostat can lead to excessive heat build-up in the geyser, contributing to dripping.
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 is the risk of 'Water hammer', which can damage the plumbing system.
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 sketch should show a junction depicting the angles and where the inspection eye is located.
Step 17
4.9 Choose a description from COLUMN B that matches the item in COLUMN A.
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Answer
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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Answer
Dezincification is the selective leaching (removal) of Zinc from copper alloys, while galvanic corrosion is an electrochemical process that occurs between two different metals or alloys.
Step 19
4.11 Describe ONE way in which to prevent galvanic corrosion.
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Answer
Galvanic corrosion can be prevented by ensuring there is no contact with electrolytes, for example, by electrically insulating the two metals.
