Wind Mills

Q.

What are the disadvantages of wind energy?

Q.

Which form of energy helps in the production of electricity in wind turbines?

1. wind

2. sun

3. water

4. gravitation

Q.

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

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

2. Depends on the height of the tower

Q.

Explain the energy transformations in windmill?

Q.

Horizontal axis and Vertical axis of turbine are the types of _______

Q.

What are the advantages of wind energy?

Q.

The minimum speed of wind necessary for a small windmill to rotate and produce electricity is

1. 15 km/h

2. 25 km/h

3. 40 km/h

4. 30 km/h

Q.

Choose the incorrect statement regarding wind power:

1. The potential energy content of wind blowing at high altitudes is the source of wind power.

2. Wind hitting at the blades of a windmill causes them to rotate The rotation thus achieved can be utilised further.

3. One possible method of utilising the energy of rotational motion of the blades of a windmill is to run the turbine of an electric generator.

4. It is expected to harness wind power to minimum in open space.

Q.

How does a wind mill generate electric energy ?

1. potential energy of wind- rotation of wind mill- electrical energy

2. kinetic energy of wind- rotation of wind mill- electrical energy

3. solar energy- rotation of wind mill- electrical energy

4. sea breeze and land breeze- rotation of wind mill- electrical energy

Q. Question 11
The power generated in a windmill

1. Is more in rainy season since damp air would mean more air mass hitting the blades
2. Depends on the height of the tower
3. Depends on wind velocity
4. Can be increased by planting tall trees close to the tower

Q. In windmills, the energy of slow rotating blades transfers to fast rotating machines with the help of .

1. gears
2. pulley
3. spring

Q.

A Windmill utilises kinetic energy of air to do mechanical work.

1. True
2. False

Q. What are the limitations in obtaining energy from wind?

Q.

Consider the following processes:
1. Wind rotates the blades of the windmill
2. Electrical energy produced
3. Turbine rotates
4. Blowing of wind
Which of the following predicts the correct order of events?

1. 3-2-1-4

2. 1-2-3-4

3. 4-3-2-1

4. 4-1-3-2

Q.

The power generated in a windmill:

1. Depends on the height of the tower

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

3. Depends on wind velocity

4. Can be increased by planting tall trees close to the tower

Q.

The power generated in a windmill

1. Depends on wind velocity

2. Depends on the height of the tower

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

4. Can be increased by planting tall trees close to the tower

Q. A windmill converts wind energy into electrical energy. If v is the wind speed , then prove that electrical power output is proportional to v ³ .

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

Q. Where will you find the country's largest installation of wind turbines?

1. Kanya Kumari
2. Manikaran
3. Puga
4. Tatapani

Q.

The power generated in a windmill ______.

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

2. depends on the height of the tower.

3. depends on wind velocity.

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

Q. Windmills convert energy into energy.

1. electrical
2. mechanical
3. sound
4. light

Q.

A windmill is :

1. a machine which grinds flour.

2. a machine that converts wind energy to rotational energy.

3. a machine which stops the wind from flowing.

4. a machine that converts potential to kinetic energy.

Q. Windmill utilizes the kinetic energy of which resource?

1. wind on the Earth
2. water on the Earth
3. heat from the Sun
4. light from the Sun

Q. Which device is used to increase rotational speed of generator from a low speed rotor blades ?

1. 
   Chain
2. 
   Gears
3. 
   Pulley
4. 
   Electric motor

Q.

How was wind energy harnessed traditionally?

1. to do mechanical work

2. to lift water

3. to grind food grains

4. all of these

Q.

A windmill is a:

1. A machine which grinds flour.

2. A machine that converts wind energy to rotational energy.

3. A machine which stops the wind from flowing.

4. None of the above

Q.

Name the device which works on wind power.