3.1 Change the underlined word(s) in the following to make the statements correct - NSC Civil Technology Civil Services - Question 3 - 2024 - Paper 1
Question 3
3.1 Change the underlined word(s) in the following to make the statements correct. Write the appropriate word(s) next to the question numbers (3.1.1 to 3.1.5) in the... show full transcript
Worked Solution & Example Answer:3.1 Change the underlined word(s) in the following to make the statements correct - NSC Civil Technology Civil Services - Question 3 - 2024 - Paper 1
Step 1
3.1.1 The slope at which a 225 mm diameter pipe should be laid is
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Answer
The slope at which a 225 mm diameter pipe should be laid is 1 : 60.
Step 2
3.1.2 The recommended thickness of layers for backfilling is
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The recommended thickness of layers for backfilling is 150 mm.
Step 3
3.1.3 The OSS specifies that all excavation work should be carried out
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The OSS specifies that all excavation work should be carried out under supervision.
Step 4
3.1.4 At excavations,
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At excavations, orange/red warning signals must be visible at all times.
Step 5
3.1.5 Where soil is moderately firm,
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Where soil is moderately firm, the vertical members of shoring should be placed loose/waterlogged.
Step 6
3.2 Explain the process of soil compaction.
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Soil compaction is the process of increasing the density of soil by pressing the soil particles closer together. This is achieved through various methods such as mechanical compaction, where equipment like rollers or vibratory plates are used to compress the soil, or by adding moisture to facilitate consolidation.
Step 7
3.3 Describe TWO precautionary measures that will allow a worker to work in an excavated trench.
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The sides of the excavation must be properly supported: This prevents soil collapse that can trap workers.
The supervisor must ensure that no load, material or heavy machinery is placed near the edge of any excavation: This reduces the risk of cave-ins and unsafe working conditions.
Step 8
3.4.1 Pipe carrying mixed (temperature) water
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3.4.1: Cross linked polyethylene (XLP).
Step 9
3.4.2
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3.4.2: Pex-pipe.
Step 10
3.4.3
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3.4.3: Copper.
Step 11
3.4.4
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3.4.4: Hot-water pipe.
Step 12
3.4.5
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3.4.5: Mixer tap.
Step 13
3.4.6
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3.4.6: Chrome/Brass.
Step 14
3.4.7
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3.4.7: 90° Elbow.
Step 15
3.5 Calculate the fall of the drainpipe between point A and B
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To calculate the fall of the drainpipe:
Length of pipe = 5000 mm
Fall of drainpipe = rac{1}{60} imes 5,000 = 83.3 mm
This gives a fall of 83.3 mm or 0.083 m.
Step 16
3.6 Name TWO tools that are used to set out the fall for a trench over a short distance.
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Spirit level
Dumpy level.
Step 17
3.7 Name ONE member that forms part of a temporary structure that is used.
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