Q. Which of the following blade designs is becoming less popular?

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Q. The airfoil/curve blade designs are affected by drag along its length.

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Q. How is drag force experienced by the blade reduced in various modern blade designs?

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Q. What is angle of attack?

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Q. When plotting lift vs angle of attack, which of following best describes the shape of the curve?

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Q. There is no ideal angle of attack for best rotation.

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Q. The speed at the tip of the blade is faster than its center.

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Q. What is the angle by which the rotor blades are twisted?

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Q. Which of the following blade designs further increases the efficiency of airfoil blades?

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Q. Why is a blade twisted along its length rather than its width?

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Q. Which of the following blade designs further increases the efficiency of airfoil blades?

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Q. Why does wind speed increase with height above ground?

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Q. Increased wind tower height and longer blades do not result in an increase in power.

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Q. Why should longer turbine blades be made of stronger materials?

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Q. Which of the following is best reason for not using longer blades even though they produce greater output power?

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Q. Which theory is used to model the wind turbine?

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Q. What is blade element momentum theory?

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Q. Wind turbines convert wind energy to ________

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Q. Which of the following components of a wind turbine system is arranged in the order in which energy is being converted?

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Q. Which of the following are commonly used commercial wind turbines?

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