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Wind Mills

The power gen...

Question

The power generated in a windmill ______.

A

is more in rainy season since damp air would mean more air mass hitting the blades.

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B

depends on the height of the tower.

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C

depends on wind velocity.

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D

can be increased by planting tall trees close to the tower.

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Solution

The correct option is C
depends on wind velocity.

The power generated in a windmill depends on wind velocity as kinetic energy of wind is converted into electrical energy. Planting tall trees around the windmill would decrease the wind velocity which is not desirable. It does not depends upon the season or time of the day.

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Similar questions

Q. The blades of a windmill sweep out a circle of area A.
(a) If the wind flows at a velocity v perpendicular to the circle, what is the mass of the air passing through it in time t?
(b) What is the kinetic energy of the air?
(c) Assume that the windmill converts 25% of the winds energy into electrical energy, and that A = 30

m^{2}

, v = 36 km/h and the density of air is 1.2 kg

m^{3}

. What is the electrical power produced?

Q. Question 11
The power generated in a windmill

(a) is more in rainy season since damp air would mean more air mass hitting the blades
(b) depends on the height of the tower
(c) depends on wind velocity
(d) can be increased by planting tall trees close to the tower

The power generated in a windmill depends on the wind velocity of the region.

Q. Question 14
Choose the incorrect statement regarding wind power.

(a) It is expected to harness wind power to minimum in open space.
(b) The potential energy content of wind blowing at high altitudes is the source of wind power.
(c) Wind hitting at the blades of a windmill causes them to rotate The rotation thus achieved can be utilised further.
(d) One possible method of utilising the energy of rotational motion of the blades of a windmill is to run the turbine.

Q. The blades of a windmill sweep out a circle of area 2 m2. If the velocity of wind flows perpendicular to the circle is 18 km/h and density of air is 1.2 kg/m, then find the power of windmill.

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