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Wind Energy Quiz 13 (10 MCQs)

This set of multiple-choice questions evaluates knowledge on wind energy systems, including the operation of wind turbines, energy conversion principles, and the growth of wind power capacity. Concepts covered include vertical axis wind turbines (VAWT), Darrieus wind turbines, and the measurement of wind strength and energy output. The questions assess understanding of clean electricity generation, installed capacity, and the historical development of wind energy in regions like China and India during the 1990s.

Quiz Instructions

Select an option to see the correct answer instantly.

1. What energy is used to move the fans of a wind mill?

Correct Answer: Correct answer is: (E) Wind energy.

Exam Relevance: GRE, GATE, NEET, JEE

Difficulty: Easy

Concept notes: Wind energy is the energy harnessed from the movement of air, which is used to turn the blades of a wind turbine.

Common Mistakes: A common misunderstanding is that wind turbines generate wind, but in reality, they use the existing wind to generate electricity.

Explanations: Wind energy is the correct answer because wind turbines use the kinetic energy of the wind to turn the blades, which in turn drives a generator to produce electricity. The wind is the primary source of energy that moves the fans (blades) of the wind turbine.

Option Analysis:

Option A: Light energy is not used to move the fans of a wind turbine. Light energy is typically used in solar panels to generate electricity.
Option B: Heat energy is not the primary source of energy for moving the fans of a wind turbine. Heat energy is used in thermal power plants.
Option C: Solar energy is not used to move the fans of a wind turbine. Solar energy is used in photovoltaic cells to generate electricity.
Option D: Hydro energy is not used to move the fans of a wind turbine. Hydro energy is used in hydroelectric power plants where water flow is the driving force.
Option E: Wind energy is the correct answer because the wind is the primary source of energy that moves the fans (blades) of the wind turbine.

Mnemonic: Wind moves the blades, not the other way around.

2. Darrieus Type of wind Turbines are of

Correct Answer: Correct answer is: (B) Vertical Axis type.

Exam Relevance: Wind Energy Certification, Renewable Energy Exams, Mechanical Engineering Exams

Difficulty: Easy

Concept notes: The Darrieus wind turbine is a type of vertical axis wind turbine (VAWT). It is characterized by its vertical axis of rotation and the use of airfoils that rotate around a vertical shaft.

Common Mistakes: A common misunderstanding is that all wind turbines are horizontal axis wind turbines (HAWT). However, the Darrieus turbine is a distinct type that operates on a vertical axis.

Explanations: The Darrieus wind turbine operates on a vertical axis, which means the main rotor shaft is set vertically. This design allows the turbine to capture wind from any direction without the need for yaw mechanisms to align with the wind direction. The vertical axis design is a defining characteristic of the Darrieus turbine, making it distinct from horizontal axis turbines.

Option Analysis:

Option A: Incorrect. Horizontal Axis Type refers to turbines where the main rotor shaft is horizontal, not vertical.
Option B: Correct. The Darrieus turbine is a Vertical Axis Type turbine.
Option C: Incorrect. Floating Axis Type is not a recognized category for wind turbines.
Option D: Incorrect. The Darrieus turbine is a specific type of vertical axis turbine.

3. Many countries have wind turbine energy. Which one has installed the largest wind power capacity in 2015?

Correct Answer: Correct answer is: (B) China.

Exam Relevance: GRE, GMAT, Energy Engineering Exams, Environmental Science Exams

Difficulty: Easy

Concept notes: China has been the world leader in wind power capacity since 2010, and this trend continued into 2015.

Common Mistakes: A common mistake might be to assume that a more technologically advanced country like Japan or Russia would have the largest wind power capacity.

Explanations: China has invested heavily in renewable energy, particularly wind energy, to meet its growing energy demands and reduce pollution. By 2015, China had installed the largest wind power capacity globally, surpassing other countries in terms of both installed capacity and new installations.

Option Analysis:

Option A: Russia has a significant potential for wind energy but has not installed the largest capacity by 2015.
Option B: China has the largest wind power capacity installed by 2015.
Option C: Japan has a smaller wind power capacity compared to China by 2015.
Option D: This option is incorrect as China is the correct answer.

4. Wind energy is measured by .....

Correct Answer: Correct answer is: (C) MWh.

Exam Relevance: GRE, GATE, FE Exam, Professional Engineering Exams

Difficulty: Moderate

Concept notes: Wind energy is typically measured in megawatt-hours (MWh), which is a unit of energy.

Common Mistakes: A common misunderstanding is that wind energy is measured in units of speed (MPH) or temperature (Kelvin), which are not appropriate for measuring energy.

Explanations: Wind energy is the energy generated by wind turbines, and it is measured in units of energy, specifically megawatt-hours (MWh). This unit represents the amount of energy produced over a period of time. Other units like miles per hour (MPH) measure speed, Kelvin measures temperature, and kilograms (Kg) measure mass, none of which are appropriate for quantifying energy output from wind turbines.

Option Analysis:

Option A: MPH measures speed, not energy.
Option B: Kelvin measures temperature, not energy.
Option C: MWh measures energy, which is the correct unit for wind energy.
Option D: Kg measures mass, not energy.

5. What do engineers and scientists build to harness wind energy?

Correct Answer: Correct answer is: (B) Turbines.

Exam Relevance: GRE, GATE, FE Exam, AP Environmental Science

Difficulty: Easy

Concept notes: Wind energy is harnessed using wind turbines, which convert the kinetic energy of the wind into electrical energy.

Common Mistakes: A common misunderstanding is that fans or pinwheels are used to harness wind energy, but these are not designed for large-scale energy production.

Explanations: Wind turbines are specifically designed to capture the kinetic energy of the wind and convert it into electrical energy. They consist of large blades that rotate when the wind blows, driving a generator to produce electricity. This makes turbines the primary tool used by engineers and scientists to harness wind energy.

Option Analysis:

Option A: Fans are used to move air, not to generate electricity from wind.
Option B: Turbines are the correct choice as they are designed to convert wind energy into electrical energy.
Option C: Generators are a component of turbines, but they do not directly harness wind energy on their own.
Option D: Pinwheels are toys and not designed for large-scale energy production.

6. When did the development of wind power in India began:

Exam Relevance: GATE, IES, UPSC

Difficulty: Moderate

Concept notes: The development of wind power in India began in the early 1990s, with significant efforts to harness wind energy for electricity generation.

Common Mistakes: A common misunderstanding is that wind power development in India started much earlier, possibly due to the country's long history with traditional windmills.

Explanations: The development of wind power in India as a modern energy source began in the early 1990s. This period marked the introduction of large-scale wind farms and the establishment of policies to promote renewable energy. Prior to 1990, wind energy was not a significant contributor to India's energy mix, and the focus was primarily on traditional windmills for water pumping and other mechanical tasks.

Option Analysis:

Option A: 1965 is incorrect as wind power development in India did not begin until the 1990s.
Option B: 1954 is incorrect as wind power development in India did not begin until the 1990s.
Option C: 1990 is correct as it marks the beginning of significant efforts to develop wind power in India.
Option D: 1985 is incorrect as wind power development in India did not begin until the 1990s.

Mnemonic: Wind Power, 1990s, Modern Era

7. A windmill is a machine that converts wind energy into:

Correct Answer: Correct answer is: (B) Mechanical or electrical energy.

Exam Relevance: AP Environmental Science, GRE, GATE, NEET

Difficulty: Easy

Concept notes: Windmills convert the kinetic energy of wind into mechanical or electrical energy.

Common Mistakes: A common misunderstanding is that windmills can convert wind energy into other forms of energy, such as food or solar power, which is incorrect.

Explanations: Windmills are designed to capture the kinetic energy of wind and convert it into mechanical energy through the rotation of blades. This mechanical energy can then be used directly or converted into electrical energy through a generator. The other options (food, solar power, and rain) are not forms of energy that windmills can directly convert wind energy into.

Option Analysis:

Option A: Windmills do not convert wind energy into food.
Option B: Windmills convert wind energy into mechanical or electrical energy.
Option C: Windmills do not convert wind energy into solar power.
Option D: Windmills do not convert wind energy into rain.

Mnemonic: Windmill = Wind to Work (mechanical or electrical)

8. The process by which the wind is used to generate mechanical energy used for producing electricity

Correct Answer: Correct answer is: (D) Wind Energy.

Exam Relevance: AP Environmental Science, GRE, GATE, FE Exam

Difficulty: Easy

Concept notes: Wind energy is the process of converting kinetic energy from the wind into electrical energy using wind turbines.

Common Mistakes: A common misunderstanding is confusing wind energy with other renewable energy sources like hydroelectric, solar, or geothermal energy.

Explanations: Wind energy involves using wind turbines to capture the kinetic energy of the wind and convert it into mechanical energy, which is then used to generate electricity. This process is distinct from other forms of renewable energy such as hydroelectric, solar, and geothermal energy.

Option Analysis:

Option A: Hydroelectric energy involves converting the energy from flowing water into electricity, not wind.
Option B: Solar energy involves converting sunlight into electricity, not wind.
Option C: Geothermal energy involves using heat from the Earth to generate electricity, not wind.
Option D: Wind energy involves using wind to generate mechanical energy, which is then converted into electricity.

Mnemonic: Wind turbines spin, not water, sun, or earth.

9. Installed Capacity of Wind-power in India is close to

Correct Answer: Correct answer is: (C) 40 GW.

Exam Relevance: GATE, GRE, IES, UPSC

Difficulty: Moderate

Concept notes: The installed capacity of wind power in India is a measure of the total amount of wind energy generation capacity that has been installed and is operational.

Common Mistakes: A common mistake is to confuse the installed capacity with the actual energy generated, which can vary based on factors like wind speed and turbine efficiency.

Explanations: As of the latest data, the installed capacity of wind power in India is close to 40 GW. This figure represents the total capacity of wind turbines that have been installed and are operational across the country. The wind energy sector in India has seen significant growth over the years, making it a key component of the country's renewable energy strategy.

Option Analysis:

Option A: 20 GW is too low, as the installed capacity has surpassed this figure.
Option B: 30 GW is also too low, as the installed capacity has grown beyond this level.
Option C: 40 GW is the correct answer, as it aligns with the most recent data on installed wind power capacity in India.
Option D: 50 GW is too high, as the installed capacity has not yet reached this level.

10. A town wants more clean electricity. They can build on a mountaintop or in a valley with weak breezes. Which site should they choose for wind turbines, and why?

Correct Answer: Correct answer is: (D) Mountaintop, because winds are stronger.

Exam Relevance: GRE, AP Environmental Science, Engineering Entrance Exams

Difficulty: Moderate

Concept notes: Wind turbines generate electricity by converting the kinetic energy of wind into electrical energy. The efficiency and power output of wind turbines are directly related to the strength of the wind.

Common Mistakes: A common misunderstanding is that the height of the tower or the temperature of the air is the most critical factor for wind turbine placement. However, the strength of the wind is the primary factor for optimal performance.

Explanations: Mountaintops typically experience stronger and more consistent winds compared to valleys. Stronger winds provide more kinetic energy, which translates to higher electricity generation. Therefore, placing wind turbines on a mountaintop is more effective for generating clean electricity.

Option Analysis:

Option A: The height of the towers is not the primary factor for wind turbine efficiency. Stronger winds are more important.
Option B: Avoiding clouds is not a significant factor in wind turbine placement. Wind strength is more critical.
Option C: Warmer air in the valley does not necessarily mean stronger winds. Wind strength is the key factor.
Option D: Mountaintops have stronger winds, which is crucial for the efficient operation of wind turbines.

Mnemonic: Wind on the mountain, power in abundance.

Frequently Asked Questions

What is wind energy?

Wind energy is a form of renewable energy that harnesses the power of wind to generate electricity. It involves converting the kinetic energy of wind into mechanical energy, which is then transformed into electrical energy.

How does a vertical axis wind turbine (VAWT) differ from a traditional wind turbine?

A vertical axis wind turbine (VAWT) operates with its rotor shaft placed vertically, allowing it to capture wind from any direction. In contrast, traditional wind turbines have a horizontal axis and require the turbine to face the wind to operate efficiently.

What is the significance of wind strength in wind energy generation?

Wind strength is crucial for wind energy generation because it directly affects the amount of kinetic energy that can be converted into electrical energy. Higher wind speeds generally result in greater energy output from wind turbines.

How is the efficiency of a wind turbine measured?

The efficiency of a wind turbine is typically measured by its capacity factor, which is the ratio of the actual energy output over a period of time to the maximum possible energy output if the turbine were running at full capacity continuously.

What is the role of installed capacity in wind power development?

Installed capacity refers to the total amount of wind power generation capacity that has been installed in a given area. It is a key indicator of the scale and progress of wind power development and helps in planning future energy needs.

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