Q. What is sub-synchronous mode in doubly-fed induction generator (DFIG)?

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Q. What is super-synchronous mode in doubly-fed induction generator (DFIG)?

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Q. Which of the following generators are mostly used in WECS?

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Q. Which of the following is a flowchart depicting WECS modelling?

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Q. _______ speed WECS is the most flexible in terms of the generator used.

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Q. What happens to wind speed when many turbines operate collectively?

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Q. Which of the following is true?

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Q. Lower wind speeds result in ________

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Q. What happens to the output power when the wind turbine blades rotate faster for the entire operation time?

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Q. Higher wind speeds _________ the speed of rotation of the wind blades.

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Q. What is cut-in wind speed?

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Q. What is rated speed?

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Q. Which of the following are the limits of the range of wind speeds for which the turbines are designed?

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Q. How does the output power vary between cut-in speed and the rated speed?

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Q. What is the cut-out speed?

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Q. Power output is not related to the local air density.

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Q. Which of the following does the local air density depend upon?

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Q. Higher air density leads to higher power output.

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Q. What is feather of wind turbine blades?

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Q. Why is feathering of wind turbine blades required?

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