6.1 Various options are given as possible answers to the following questions - NSC Civil Technology Civil Services - Question 6 - 2021 - Paper 1
Question 6
6.1 Various options are given as possible answers to the following questions. Choose the answer and write only the letter (A–D) next to the question numbers (6.1.1 t... show full transcript
Worked Solution & Example Answer:6.1 Various options are given as possible answers to the following questions - NSC Civil Technology Civil Services - Question 6 - 2021 - Paper 1
Step 1
6.1.1 A pipe arrangement that prevents the breaking of the water seal of a water closet is:
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Answer
The correct answer is B. Anti-siphon pipes. These pipes prevent the siphoning action which could break the water seal, ensuring that sewer gases do not enter the building.
Step 2
6.1.2 Pipes that are NOT suitable for continuous hot-water discharge and liquids that contain chemicals:
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Answer
The correct answer is A. PVC pipes. PVC is not resistant to high temperatures or certain chemicals, making it unsuitable for such conditions.
Step 3
6.1.3 Water that contains human waste is known as … water.
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The correct answer is B. contaminated. This indicates the water's unsuitability for general use.
Step 4
6.1.4 The colour … is used to indicate waste-water pipes on a diagram:
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The correct answer is B. brown. Brown is commonly used to designate waste-water pipes in plumbing diagrams.
Step 5
6.1.5 Which ONE of the following prevents odours from entering the atmosphere?
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The correct answer is D. All of the above. Each of these components—water seal, soil vent pipe, and vent valves—play a role in preventing odours.
Step 6
6.2.1 Explain a reason for applying flux to the joint before soldering.
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Applying flux to the joint cleans the surfaces and allows solder to flow evenly around the joint, enhancing the strength and quality of the solder joint.
Step 7
6.2.2 Explain the process of soldering the joint after the flux has been applied.
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After applying flux, heat the joint with a soldering iron until the solder melts and flows into the joint, creating a strong and watertight bond upon cooling.
Step 8
6.3.1 Identify the type of compression joint.
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The compression joint is a T-joint/T. This type of joint is used to connect pipes at an angle.
Step 9
6.3.2 Identify A.
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A is the compression ring or ferrule. It creates a seal between the pipe and the nut.
Step 10
6.3.3 Explain the function of A.
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The function of A, the compression ring, is to create a watertight seal by tightening against the pipe when the nut is screwed down.
Step 11
6.4 Name the adhesive used to join PVC pipes.
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The adhesive used to join PVC pipes is called PVC glue or PVC solvent cement.
Step 12
6.5 Describe ONE regulation that should be adhered to when laying pipes for sanitary fittings.
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One regulation is that the pipes must be watertight under normal working conditions to prevent leaks and ensure proper drainage.
Step 13
6.6.1 Differentiate between the functions of chambers A and B.
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Chamber A receives solid waste for decomposition, whereas Chamber B stores excess water until it is discharged, helping manage the flow and function of the septic system.
Step 14
6.6.2 Explain the purpose of C.
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The purpose of C is to access the septic tank for inspection and maintenance, ensuring proper functioning and sanitation.
Step 15
6.6.3 Name the organism that decomposes the solid waste in a septic tank.
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The organism responsible for decomposing the solid waste in a septic tank is bacteria.
Step 16
6.6.4 Predict the consequence of allowing water from the bath and wash basin to flow into the septic tank.
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Allowing water from these sources could disturb the balance of the septic tank, potentially killing the bacteria needed for decomposition and leading to system failure.
Step 17
6.6.5 Name the installation into which the liquid from chamber B flows.
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The liquid from chamber B typically flows into a French drain, which facilitates the drainage of wastewater.
Step 18
6.7 Describe TWO criteria that pipe fittings should meet when they are connected to pipes.
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Two criteria are: (1) They must be watertight under normal working conditions, and (2) they must be able to withstand external pressure without failure.
Step 19
6.8 Use ANSWER SHEET 6.8 and complete the sewerage layout using the correct installation principals with the correct abbreviations and symbols.
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Answer
Refer to your diagram, ensuring all pipes, fittings, and symbols comply with standard plumbing guidelines.
Step 20
6.9 Draw a neat line diagram in your ANSWER BOOK showing the connection of the hot-water and cold-water supply to the shower head (rose).
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Make sure to indicate that both hot and cold-water supplies come from the ceiling, and clearly show the flow direction and all relevant fittings in your diagram.
