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 an S-trap, designed to prevent sewer gases from entering the building.
Step 2
Explain the purpose of a water trap.
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Answer
The primary purpose of a water trap is to block sewer gases (foul air) from the sewerage system from entering the building, ensuring a safe and odor-free indoor environment.
Step 3
State TWO factors that determine the temperature of the water in a solar heater.
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The season and weather conditions, such as cloud cover and temperature.
The angle and position of solar panels which influence the intensity of sunlight received.
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 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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The cold water inlet is positioned at the bottom of the geyser to ensure that incoming cold water doesn't mix with the already heated water, allowing for efficient heating of the water. Conversely, the hot water outlet is at the top to facilitate the draw-off of hot water, which rises naturally due to convection.
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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The safety component is called a temperature and pressure relief valve, designed to release excess pressure to prevent bursting.
Step 7
Explain the function of the grid.
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Answer
The storm-water grid functions to drain storm water and allow it to enter the storm water system, preventing flooding and water accumulation 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 overflowing water that may damage road surfaces and cause flooding in surrounding areas.
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 the symbol for a fluorescent light as per standard electrical symbols.
Step 11
Distribution board at B.
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Answer
Draw the symbol for a distribution board, ensuring it is placed accurately in the floor plan.
Step 12
Double-pole one-way light switch at C.
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Answer
Include the symbol for a double-pole one-way light switch at location C.
Step 13
Electrical wiring from C to A.
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Indicate the electrical wiring connecting points A and C using appropriate symbols.
Step 14
Rodding eye.
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Answer
Draw a rodding eye symbol as part of the sewerage system.
Step 15
Gully.
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Include the symbol for a gully in the diagram.
Step 16
Ventilation pipe.
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Draw the symbol representing a ventilation pipe in the sewerage layout.
Step 17
Branch pipes.
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Include the symbols for two branch pipes at required positions.
Step 18
Inspection eyes.
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Draw symbols for two inspection eyes as per the guidelines.
Step 19
Abbreviations for sewerage components.
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Provide any three recognized abbreviations such as G.W., P.V.C., and I.E.
