FIGURE 4.1 below shows a geyser - NSC Civil Technology Civil Services - Question 4 - 2018 - Paper 1
Question 4
FIGURE 4.1 below shows a geyser.
4.1.1 Identify the type of geyser in FIGURE 4.1 above.
4.1.2 Which part inside the geyser heats the water?
4.1.3 Geysers use a lo... show full transcript
Worked Solution & Example Answer:FIGURE 4.1 below shows a geyser - NSC Civil Technology Civil Services - Question 4 - 2018 - Paper 1
Step 1
4.1.1 Identify the type of geyser in FIGURE 4.1 above.
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Answer
The type of geyser shown in FIGURE 4.1 is a high pressure geyser, commonly referred to as an electrical geyser.
Step 2
4.1.2 Which part inside the geyser heats the water?
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The part inside the geyser that heats the water is called the element.
Step 3
4.1.3 Geysers use a lot of electricity. Recommend ONE other device that can be used to heat water without using electricity.
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One other device that can be used to heat water without using electricity is a solar geyser.
Step 4
4.2.1 Dripping geyser overflow.
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A dripping geyser overflow may indicate that the pressure control or relief valve is faulty or there is a pipe joint leakage.
Step 5
4.2.2 No hot water.
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If there is no hot water, it may be caused by a power failure to the geyser or a faulty circuit breaker.
Step 6
4.2.3 Water leaking through the ceiling.
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Water leaking through the ceiling could be the result of a burst geyser or a significant leak in the system.
Step 7
4.4.1 Automatic shut-off valve.
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[SANS Symbol for Automatic Shut-off Valve]
Step 8
4.4.2 Non-return valve.
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[SANS Symbol for Non-return Valve]
Step 9
4.4.3 Pressure reducing valve.
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[SANS Symbol for Pressure Reducing Valve]
Step 10
4.5 Explain, in FOUR steps, how you would fix a leaking copper pipe with compression joints.
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Cut the damaged section from the pipe using a pipe cutter.
Move the pipe slightly sideways to allow fixing of compression fittings.
Measure and cut the length of pipe to be replaced.
Slip the nuts over the pipes followed by the ferrules, push the pipes into the fittings, and tighten using the correct tools.
Step 11
4.6.1 Identify the fitting in FIGURE 4.6.
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The fitting in FIGURE 4.6 is identified as a P-Trap or Water trap.
Step 12
4.6.2 Name the material that is used to manufacture this fitting.
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The material used to manufacture this fitting is PVC, Plastic, or Rubber.
Step 13
4.6.3 Which part, A or B, will be connected to the bottom of the wash basin?
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Part B will be connected to the bottom of the wash basin.
Step 14
4.6.4 Describe the purpose of the seal at C.
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The seal at C ensures a watertight seal and prevents it from leaking.
Step 15
4.7.1 Identify the taps in FIGURES A and B respectively.
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The tap in FIGURE A is a brass tap, while the tap in FIGURE B is a plastic tap.
Step 16
4.7.2 Describe where you would use EACH of the taps above.
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The brass tap (FIGURE A) is suitable for outdoor use due to its durability, while the plastic tap (FIGURE B) is ideal for indoor or less exposed areas.
Step 17
4.7.3 Explain the advantage of plastic taps over brass taps on the outside of a building.
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The advantage of plastic taps over brass taps is that they are less likely to rust, are lighter, and generally cheaper.
Step 18
4.8 Explain the purpose of installing a water meter on the incoming supply pipe of a house.
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A water meter is installed to measure the amount of water consumed by a household, allowing for accurate billing and monitoring of water usage.
Step 19
4.9.1 Describe dezinification.
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Dezinification is the selective leaching of zinc from copper alloys, which occurs when the alloy reacts chemically with water.
Step 20
4.9.2 Describe the problems dezinification can cause.
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Dezinification can cause zinc to dissolve from the surface of an alloy, leading to structural weaknesses, and can result in leaks if it progresses through pipes or fittings.
Step 21
4.10 Recommend ONE method to remove scale or corrosion from a metal surface.
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One method to remove scale or corrosion is by using electrolytic cleaning with a bristle brush and sandpaper.
Step 22
4.11 One function of a centrifugal pump is to convert kinetic energy to another type of energy.
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A centrifugal pump converts kinetic energy to pressure energy.
Step 23
4.12 Name this type of energy.
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The type of energy produced is known as pressure energy.
Step 24
4.13 Which tool would you use to clear blockages in drains?
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To clear blockages in drains, a plumber's snake or a drain cleaning machine can be used.
Step 25
4.14 Recommend ONE tool that can be used to test for leakages in a below-ground drainage system.
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One tool that can be used to test for leakages is a hydro-static test kit.
