3.1.1 Name TWO instances where a small wind turbine can be useful on a farm - NSC Agricultural Technology - Question 3 - 2024 - Paper 1
Question 3
3.1.1 Name TWO instances where a small wind turbine can be useful on a farm.
3.1.2 State TWO disadvantages of wind turbines.
3.1.3 Describe the importance of a lar... show full transcript
Worked Solution & Example Answer:3.1.1 Name TWO instances where a small wind turbine can be useful on a farm - NSC Agricultural Technology - Question 3 - 2024 - Paper 1
Step 1
Name TWO instances where a small wind turbine can be useful on a farm.
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Answer
A small wind turbine can be useful on a farm for:
Operating an electrical water pump to supply irrigation.
Providing auxiliary power for security equipment, lights, or charging batteries.
Step 2
State TWO disadvantages of wind turbines.
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Answer
The disadvantages of wind turbines include:
Insufficient wind in the area, which can limit their effectiveness.
High initial cost, which can deter investment.
Step 3
Describe the importance of a large wing area of a wind turbine in relation to the generation of electrical energy.
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Answer
A large wing area on a wind turbine is crucial because it increases the surface area available to capture wind energy. The larger the wing area, the more wind energy can be harnessed to rotate the turbine and generate electrical energy efficiently.
Step 4
Name the device installed in the head of the wind turbine to decrease torque and increase input shaft speed to the generator.
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Answer
The device is known as a gearbox.
Step 5
Identify the type of alternative energy system in the picture above.
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Answer
The type of alternative energy system is Photovoltaic/Solar energy.
Step 6
Name a suitable material for the coating on the panels and state ONE property of this coating.
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Answer
A suitable material for the coating on the panels is Teflon. One property of Teflon is that it is self-cleaning, which improves efficiency.
Step 7
Batteries can be recharged using the system above. What can be installed in the system to prevent overcharging of the batteries?
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Answer
A regulator or charge controller can be installed to prevent overcharging of the batteries.
Step 8
Study the table below and rearrange the working principles of a geothermal power station in the correct sequence.
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Answer
The correct sequence of steps is:
Cold water is pumped into the borehole.
Underground heat source heats up the water.
Steam is transferred to the turbine & generator unit.
Generated electrical energy is sent to the national grid.
A condenser cools the steam and water is formed.
Step 9
Describe the term biofuel and give ONE example of such a fuel.
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Answer
Biofuel refers to any liquid fuel derived from biological material that can be combusted and used as an energy source. An example of a biofuel is Methane gas, or other forms like Ethanol.
