The pictures below show three components of an irrigation system - NSC Agricultural Technology - Question 6 - 2022 - Paper 1
Question 6
The pictures below show three components of an irrigation system. Name the different components and give ONE function of EACH.
- Component 1:
- Component 2:
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Worked Solution & Example Answer:The pictures below show three components of an irrigation system - NSC Agricultural Technology - Question 6 - 2022 - Paper 1
Step 1
6.1.1 Name the different components of an irrigation system and give ONE function of EACH.
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Answer
Irrigation Timer: Controls the flow of water by turning it on and off, used for scheduling irrigation.
Electronic Valve: Regulates the direction of water flow in the system, allowing for efficient management of resources.
Sprinkler/Sprayer: Distributes water over a wide area, mimicking rainfall for effective irrigation.
Step 2
6.2.1 Give TWO reasons for determining the flow rate of the pump.
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Answer
To ensure the correct calibration of sprayers, maximizing efficiency and minimizing water waste.
To plan and schedule effective irrigation, preventing over or under-utilization of water resources.
Step 3
6.2.2 Calculate the flow rate in litres per minute of the pump.
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Answer
Flow Rate = Content / Time
= 10,000 litres / 8 minutes
= 1,250 litres/minute.
Step 4
6.3 What type of device is suitable for sending this location?
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GPS or tablet devices are suitable for sending the exact location.
Step 5
6.4.1 Choose the irrigation system, A or B, that is most suitable for fields on steep slopes. Motivate your answer.
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Answer
Irrigation System B is most suitable for steep slopes because it prevents runoff water, thereby conserving moisture and minimizing soil erosion.
Step 6
6.4.2 Why would irrigation system A be preferred to system B on a planted grazing field?
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Irrigation System A is preferred as it does not require removal of equipment from the field, is less labor-intensive, and allows for more uniform irrigation without damage from animals.
Step 7
6.5.1 Identify the design error in the drawing of the septic tank above.
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Answer
The design error is that the outlet is higher than the inlet, which prevents proper drainage of waste.
Step 8
6.5.2 Describe the importance of installing a manhole in a septic tank.
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A manhole is crucial for general maintenance, allowing for access to check and manage the tank. It also helps in removing solids, adding necessary bacteria for breakdown, and prevents clogging.
Step 9
6.5.3 Suggest a suitable drainage system to be connected to the outlet of the septic tank.
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A French drain or drainage field is suitable as it allows for proper dispersal of effluent and prevents backflow.
Step 10
6.6 What is the main cause of blockages in the sewage system of a town or city?
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The main cause of blockages is the disposal of non-degradable materials, along with issues like lack of maintenance and root obstructions.
Step 11
6.7.1 Identify the type of filter that connects with a water softener. Write only the letter (A–F).
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A
Step 12
6.7.2 Which ONE of the filters above is installed ON a micro-irrigation system? Write only the letter (A–F).
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Answer
C
Step 13
6.7.3 Give ONE example of where filter C will be used.
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Filter C can be used in swimming pools to ensure water clarity.
Step 14
6.7.4 Rewrite the following sentence to make the statement TRUE.
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Filtration always takes place from the outside to the inside of the filter.
