Q. What happens on the upwind side of the wind mill blade?

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Q. The upwind side experiences a force that slows the blade.

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Q. What is lift-to-drag ratio?

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Q. A higher lift-to-drag ratio indicates a higher efficiency.

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Q. Turbine blades use a/an _______ design.

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Q. Which of the following is the governing equation for power extraction and calculation? Note that all the quantities on the right side of equation denotes a vector quantity.

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Q. Why is it necessary to have an optimal tip speed ratio (TSR)?

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Q. What is tip speed ratio (TSR)?

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Q. What does tip speed ratio (TSR) depend on?

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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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