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For satisfactory working of a windmill electric generator, the minimum value of wind velocity should be

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5 km h^{- 1}

15 km h^{- 1}

20 km h^{- 1}

30 km h^{- 1}

answer is B.

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Detailed Solution

15 km h^{- 1}

is the minimum value of the wind velocity for windmill electric generator.
For satisfactory working of a windmill electric generator, the minimum value of wind velocity should be

15 km / h

, and the maximum velocity of wind should be

50

60 km / h

to get produce the full capacity of the windmill. And if the wind is more than

90 km / h

, then we should stop the windmill to avoid any damage.

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