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State THREE advantages of system A over system B - NSC Agricultural Technology - Question 6 - 2018 - Paper 1
Question 6
State THREE advantages of system A over system B. Name THREE data sources that the irrigation management mechanism – smart controller – uses to determine local weat... show full transcript
Worked Solution & Example Answer:State THREE advantages of system A over system B - NSC Agricultural Technology - Question 6 - 2018 - Paper 1
Step 1
State THREE advantages of system A over system B.
Answer
The three advantages of irrigation system A over system B are:
- Easier Installation: System A is less expensive and easier to install compared to system B.
- Modular Design: It consists of sections that can be easily disconnected and adjusted to fit various land shapes and sizes.
- Lower Damage Risk: System A is less likely to cause damage to crops or soil compared to the fixed structure of system B.
Step 2
Name THREE data sources that the irrigation management mechanism – smart controller – uses to determine local weather conditions.
Answer
Three data sources used by a smart controller include:
- Soil Sensor: Measures moisture levels directly in the soil.
- Weather Station Data: Provides real-time information about precipitation, temperature, and humidity.
- Rain Sensors: Activated to prevent irrigation during or after rainfall.
Step 3
Recommend what a farmer should consider before choosing a type of irrigation system for a piece of land.
Answer
When choosing an irrigation system, a farmer should consider:
- Size of the Area: Assess the total area that requires irrigation.
- Land Shape and Gradient: Understand how land characteristics can affect water distribution.
- Water Availability: Evaluate the reliability and amount of water supply available.
Step 4
Name THREE instances where flood irrigation would be preferred over sprinkler irrigation.
Answer
Flood irrigation may be preferred in the following instances:
- Abundant Water Supply: When there is a plentiful water source available.
- Suitable Landscape: Areas with flat terrain that can hold water without erosion.
- Financial Constraints: When the cost of installing and maintaining a sprinkler system is too high.
Step 5
Step 6
Name THREE items that must NOT be flushed down a septic tank drainage system.
Answer
Items that should not be flushed down a septic tank include:
- Plastics: These do not decompose and can clog the system.
- Chemicals: Items like bleaches and disinfectants harm beneficial bacteria.
- Food Products: Items like oils and fats can solidify and cause blockages.
Step 7
Step 8
Name TWO factors that determine the cleaning of a septic tank.
Answer
The cleaning of a septic tank is influenced by:
- Amount of Waste: Daily waste accumulation rate affects how frequently the tank needs to be cleaned.
- Performance of the Bacteria: The effectiveness of bacteria in breaking down waste dictates maintenance frequency.
Step 9
Calculate the flow rate (litres per minute) in a water-delivering system if it takes 40 minutes to fill a 20 kl (kilolitre) tank to the top.
Answer
To calculate the flow rate, we use the formula:
Flow rate = capacity / time
Substituting the values:
Flow rate = 20,000 litres / 40 minutes = 500 litres per minute.
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Step 13
Name TWO components of the whole house water filtering system that must be checked and replaced on a regular basis.
Answer
Two components that should be regularly checked and replaced are:
- Filter Elements/Cartridges: These need to be replaced to ensure effective filtration.
- O-Rings: Checking for wear and tear is important to prevent leaks.