4.1 Choose a description from COLUMN B that matches an item in COLUMN A - NSC Civil Technology Civil Services - Question 4 - 2021 - Paper 1
Question 4
4.1 Choose a description from COLUMN B that matches an item in COLUMN A. Write only the letter (A–L) next to the question numbers (4.1.1 to 4.1.8) in the ANSWER BOOK... show full transcript
Worked Solution & Example Answer:4.1 Choose a description from COLUMN B that matches an item in COLUMN A - NSC Civil Technology Civil Services - Question 4 - 2021 - Paper 1
Step 1
4.1.1 Identify the pipe fitting.
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Answer
The pipe fitting shown in FIGURE 4.4 is a 135° bend with an inspection eye.
Step 2
4.4.2 Explain the purpose of part A.
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Answer
Part A allows access to the pipeline, provides for inspection, and enables clearing or cleaning of blockages.
Step 3
4.2 State TWO methods that are used to prevent electrolytic reaction.
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Answer
Using the same type of material throughout a system.
Use a non-metallic coupler when joining galvanised pipes to copper pipes.
Step 4
4.3.1 What role does the ball valve play in a cistern?
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Answer
The ball valve in a cistern is used to control water entering the cistern and regulate the water level.
Step 5
4.3.2 Describe how the ball valve functions.
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When the water level drops, the lever arm with the ball also drops, allowing water to enter the cistern. As water fills the cistern, the ball rises, which pushes against the plunger and closes the valve.
Step 6
4.7 The working sequence of a high-pressure geyser.
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3, 4, 5, 1, 2
Step 7
4.8 Differentiate between an air lock and a water hammer.
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Answer
Air lock is caused by air trapped at high points in the hot water system, while water hammer refers to noise and hammering caused by rapid changes in water flow.
Step 8
4.9 State ONE solution to the faults.
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For hot water flowing from the overflow pipe, test and replace the thermostat if faulty. For poor hot-water pressure, clear blockages in pipes.
Step 9
4.10 Differentiate between a solar geyser and a high-pressure electric geyser.
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A solar geyser should be installed on the roof to capture sun exposure, while a high-pressure electric geyser can be placed inside against an exterior wall.
Step 10
4.11.1 Identify the machine.
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Answer
The machine is a pipe-thread cutting machine.
Step 11
4.11.2 Explain the use of the reamer in the machine.
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Answer
The reamer is used to remove burrs after the pipe has been cut.
Step 12
4.11.3 Why must the foot switch of the machine be locked?
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The foot switch must be locked to prevent accidental starting of the machine and to avoid injuring workers.
Step 13
4.12 Name the instrument commonly used to unclog/clean a drain system.
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The instrument commonly used is a drain cleaning machine or a jetting machine.
Step 14
4.13 When cleaning a blocked drain, how will you know that the system is cleaned?
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The blocked water starts to flow freely.
Step 15
4.14 Name ONE machine that can be used to clean a blocked drain.
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One machine that can be used is the drain cleaning machine.
