3.1 Identify the water trap above - NSC Civil Technology Civil Services - Question 3 - 2017 - Paper 1
Question 3
3.1 Identify the water trap above.
3.1.2 Explain the purpose of a water trap.
3.2 State TWO factors that determine the temperature of the water in a solar heater.
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Worked Solution & Example Answer:3.1 Identify the water trap above - NSC Civil Technology Civil Services - Question 3 - 2017 - Paper 1
Step 1
Identify the water trap above.
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Answer
The water trap shown in Figure 3.1 is identified as an S-trap.
Step 2
Explain the purpose of a water trap.
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Answer
The purpose of a water trap is to prevent sewer-gas (foul air) from the sewerage system entering the building. It creates a seal that blocks gases from escaping while allowing wastewater to flow through.
Step 3
State TWO factors that determine the temperature of the water in a solar heater.
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Answer
Two factors that determine the temperature of the water in a solar heater include:
The season and cloud cover/weather conditions.
The duration of sunshine, which affects the amount of solar energy absorbed.
Step 4
Name the part in an electric geyser that is used to warm up water.
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Answer
The part in an electric geyser that is used to warm up water is called the heating element.
Step 5
Explain why the cold water inlet is mounted at the bottom of the geyser and the hot water outlet is mounted at the top of the geyser.
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Answer
The cold water inlet is mounted at the bottom of the geyser to ensure that cold water enters from the bottom, allowing it to be heated effectively. The hot water outlet is mounted at the top to enable the heated water, which is less dense, to rise and exit easily without mixing with the incoming cold water.
Step 6
Name the component that is installed for safety purposes to prevent the geyser from bursting when the water becomes too hot.
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Answer
The component installed for safety purposes to prevent the geyser from bursting when the water becomes too hot is a temperature and pressure safety valve.
Step 7
Explain the function of the grid.
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Answer
The grid receives and drains stormwater, allowing stormwater to enter the stormwater system. It also guides rainwater off the roads to the nearest stormwater pipes.
Step 8
State ONE consequence if the grid is blocked.
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Answer
One consequence if the grid is blocked is that roads may overflow with stormwater, potentially causing damage to the roadway and surrounding areas.
Step 9
Name TWO mechanical methods that may be used to obtain water from a borehole.
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Answer
Two mechanical methods that may be used to obtain water from a borehole are:
Wind pump
Submersible water pump.
Step 10
Fluorescent light at A.
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Answer
In the drawing, the fluorescent light should be represented with the standard symbol for a fluorescent light, positioned at point A.
Step 11
Distribution board at B.
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Answer
The distribution board should be represented with the standard symbol and placed at point B.
Step 12
Double-pole one-way light switch at C.
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Answer
The double-pole one-way light switch should be drawn at location C using the appropriate symbol.
Step 13
Electrical wiring from C to A.
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Answer
The electrical wiring between point C and point A should be illustrated, ensuring to follow the correct symbol representation for wires.
Step 14
Draw the incomplete layout of a sewerage system.
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Answer
The incomplete layout should include:
1 x rodding eye
1 x gully
1 x ventilation pipe
2 x branch pipes
2 x inspection eyes
And must incorporate standard symbols for each component and appropriate abbreviations.
