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3.1 List the FOUR main parts of a wind turbine - NSC Agricultural Technology - Question 3 - 2020 - Paper 1

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3.1 List the FOUR main parts of a wind turbine. 3.2 State THREE factors that determine the efficiency of an electrical solar panel. 3.3 Geothermal energy is the he... show full transcript

Worked Solution & Example Answer:3.1 List the FOUR main parts of a wind turbine - NSC Agricultural Technology - Question 3 - 2020 - Paper 1

Step 1

List the FOUR main parts of a wind turbine.

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Answer

  1. Rotor.
  2. Gearbox.
  3. Generator.
  4. Blades.

Step 2

State THREE factors that determine the efficiency of an electrical solar panel.

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Answer

  1. The cleanliness of the panel; maintaining cleanliness helps maximize efficiency.
  2. Weather conditions; sunny conditions enhance performance.
  3. The number and quality of solar panels; higher quality panels yield better results.

Step 3

Briefly describe the procedure that must be followed to harness geothermal energy and transform it into electricity.

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Answer

  1. Identify the geothermal hot spot by drilling deep holes into the Earth.
  2. Install a pipe to allow steam to rise to the surface from the hot spot.
  3. Channel the pressurized steam into a turbine, which then turns to generate electricity.
  4. Afterward, cool the steam and recycle it for further energy production.

Step 4

State TWO main problems associated with geothermal energy.

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Answer

  1. The potential for encountering high-pressure steam or escaping gases can pose safety risks.
  2. The limited availability of geothermal hotspots makes locating and harnessing this energy source challenging.

Step 5

State FOUR disadvantages of bio-fuel.

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Answer

  1. Low energy output compared to fossil fuels.
  2. High production costs associated with generating biofuels.
  3. Possible disruption to food production due to crop competition.
  4. Land resource consumption causing habitat loss.

Step 6

State FOUR advantages of the solar geyser over an ordinary electrical geyser.

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Answer

  1. Energy efficiency is improved as solar energy is free and renewable.
  2. Operating costs are significantly lower as sunlight is abundant and does not incur added expense.
  3. Low maintenance requirements, leading to less frequent repairs.
  4. Portability is enhanced; solar geysers can be easily moved or adjusted to access sunlight.

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