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:
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Answer
The correct answer is B, Anti-siphon pipes. Anti-siphon pipes help maintain the water seal in water closets by preventing air pressure differences that can cause the seal to break.
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 pipes cannot withstand high temperatures or the corrosive nature of certain chemicals, making them unsuitable for continuous hot-water discharge.
Step 3
6.1.3 A water that contains human waste is known as …
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Answer
The correct answer is D, black water. This term is used to describe wastewater that contains human excrement.
Step 4
6.1.4 The colour … is used to indicate waste-water pipes on the drawing:
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Answer
The correct answer is B, brown. In plumbing schematics, brown is typically used to represent waste-water pipes.
Step 5
6.1.5 Which ONE of the following prevents odours from entering the atmosphere?
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The correct answer is A, Water seal. A water seal is crucial for preventing undesirable odours from escaping into the living space.
Step 6
6.2.1 Explain a reason for applying flux to the joint before soldering.
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Answer
Flux is applied to clean the joint, ensuring a good bond by allowing solder to flow around the joint and adhere properly. It also prevents oxidation during the heating process.
Step 7
6.2.2 Explain the process of soldering the joint after the flux has been applied.
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Answer
Heat the joint with a soldering iron until the flux begins to bubble. Then, apply solder to the joint, allowing it to melt and flow around the joint to create a watertight seal.
Step 8
6.3.1 Identify the type of compression joint.
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Answer
The compression joint shown in Figure 6.3 is a compression ring/ferrule type of joint.
Step 9
6.3.2 Identify A.
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A is identified as a compression nut.
Step 10
6.3.3 Explain the function of A.
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The function of A, the compression nut, is to tighten and secure the joint, ensuring a leak-free connection between the pipes.
Step 11
6.4 Name the adhesive used to join PVC pipes.
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The adhesive commonly used to join PVC pipes is solvent weld/PVC glue.
Step 12
6.5 Describe ONE regulation that should be adhered to when laying pipes for sanitary fittings.
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One important regulation is that the pipes must be watertight under normal working conditions to prevent leaks and contamination.
