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 is typically referred to as an 'S-trap'. It is designed to prevent sewer gas from entering a building.
Step 2
Explain the purpose of a water trap.
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Answer
The primary purpose of a water trap is to prevent sewer gases (foul air) from entering the building. It does this by maintaining a water seal that blocks the passage of gases.
Step 3
State TWO factors that determine the temperature of the water in a solar heater.
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Answer
The position and angle of the solar panels, which affect their exposure to sunlight.
The duration of sunshine during the day, influencing how much solar energy is absorbed.
Step 4
Name the part in an electric geyser that is used to warm up water.
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The part used to warm up water in an electric geyser is known as 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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The cold water inlet is positioned at the bottom to ensure that incoming cold water does not mix with the hot water already present in the geyser, allowing for efficient heating from the bottom upwards. Conversely, the hot water outlet is at the top, so that the heated water can be easily accessed as it rises.
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 to prevent bursting is called a 'temperature and pressure relief valve'.
Step 7
Explain the function of the grid.
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Answer
The storm-water grid functions to receive and drain storm water, allowing it to enter the storm water system and thereby prevent flooding on roads.
Step 8
State ONE consequence if the grid is blocked.
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If the grid is blocked, it can lead to overflow, causing flooding on the roads and potential damage to infrastructure.
Step 9
Name TWO mechanical methods that may be used to obtain water from a borehole.
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Answer
Wind pump
Submersible water pump
Step 10
Fluorescent light at A.
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Draw a symbol representing a fluorescent light fixture at point A in the kitchen layout.
Step 11
Distribution board at B.
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Draw a symbol for a distribution board at point B of the kitchen layout.
Step 12
Double-pole one-way light switch at C.
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Draw a double-pole one-way light switch symbol at point C in the kitchen layout.
Step 13
Electrical wiring from C to A.
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Illustrate the electrical wiring connection from point C to point A in the kitchen layout.
Step 14
1 x rodding eye.
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Answer
Draw a symbol for a rodding eye in the sewerage system layout.
Step 15
1 x gully.
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Draw a symbol for a gully in the sewerage system layout.
Step 16
1 x ventilation pipe.
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Draw a symbol representing a ventilation pipe in the sewerage system layout.
Step 17
2 x branch pipes.
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Illustrate two branch pipe symbols in the sewerage system layout.
Step 18
2 x inspection eyes.
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Draw two symbols for inspection eyes in the sewerage system layout.
Step 19
Any THREE abbreviations for sewerage components.
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Answer
Possible abbreviations include G.I. for Gully Inspection, V.P. for Ventilation Pipe, and B.P. for Branch Pipe.
