Wind Energy

The total power of a wind stream is proportional to

• velocity of stream

• (velocity of stream)²

• (velocity of stream)³

• 1/ (velocity of stream)

Horizontal axis and vertical axis are the types of

• Nuclear reactor

• Wind mills

• Biogas reactor

• Solar cell

Theoretical maximum efficiency of wind power is about

• 59 %

• 48 %

• 30 %

• 65 %

How much ideal efficiency should practical turbine have?

• 10 – 12%

• 18 – 25%

• 80 – 90%

• 50 – 70%

Which of the following wind turbine is mostly used to extract wind energy?

• DC generator

• Vertical-axis wind turbines

• Sailing boat

• Horizontal-axis wind turbines

Which of the following is a potential application of wind energy?

• Converting heat to wind energy

• Converting electrical energy to wind energy

• Transportation of electrical energy

• Converting the wind flow due to speeding cars into electricity on highways

The following factor affects the distribution of wind energy

• Humidity

• The hills, trees and buildings

• Ocean current

• Wind turbine

Which type of Generator is employed in wind power plant

• Synchronous generator

• Induction generator

• Permanent magnet motor

• Brushless motor

The wind speed is measured using an instrument called

• hydrometer

• Manometer

• anemometer

• wind vane

In the case of vertical wind turbines, blades rotate about an axis __________

• perpendicular to the plane of wind streamlines

• diagonal to the plane of ground

• 30 degrees to the plane of ground

• parallel to the plane of ground