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WorksheetsWind Energy
Total questions: 20
Worksheet time: 11mins
What does Heating and cooling of the atmosphere generates?
Thermo line circulation
Radiation currents
Convection currents
Conduction currents
How much is the energy available in the winds over the earth surface is estimated to be?
2.9 X 120 MW
1.6 X 107 MW
1 MW
5 MW
What is the main source for the formation of wind?
Uneven land
Sun
Vegetation
Seasons
“During the day, the air above the land heats up more quickly than the air over water”.
True
False
What are used to turn wind energy into electrical energy?
Turbine
Generators
Yaw motor
Blades
At what range of speed is the electricity from the wind turbine is generated?
100 – 125 mph
450 – 650 mph
250 – 450 mph
30-35 mph
Which of the following is a reason for variable wind speed?
Water
Earth’s rotation
Electrons
Fans
The amount of energy available in the wind at any instant is proportional to (a) of the wind speed.
The following is (are) the classification of winds
Global wind
Local wind
Both (a) and (b)
None of the above
Global Cold wind move from
Polar to equatorial region
Equatorial to polar region
Equatorial to oceanic region
Oceanic to Equatorial region
The following factor(s) affects the distribution of wind energy
Mountain chains
The hills, trees and buildings
Frictional effect of the surface
All of the above
The wind intensity can be described by
Reynolds number
Mach number
Beaufort number
Froude number
Aero turbine is the fraction of power in the wind through the swept area which is converted into useful mechanical shaft power is called
Coefficient of performance
Coefficient of variation
Coefficient of lift
Coefficient of spin
Why is wind turbine designed to stop operation at cut out velocity?
To protect wheel against damage
To make a quick stop in emergencies
To improve the efficiency
In order to adjust the blades to wind direction
Which type of vertical wind machine has relatively low solidity and low starting torques?
Cup anemometer
Savonius rotor
Darrieus type rotor
Magnus effect rotor
What type of cross sections does wind turbine blades have?
Penta hedral cross section
Air foiled type cross section
Radar cross section
Turbo cross section
What units does the anemometer measure in?
Feet per minute
Litres per minute
Centimeters per minute
Meter per seconds
A wind turbine designed to come into operation at a minimum wind speed is called ______
Cut in velocity
Windward
Cut out velocity
Upwind location
A rotor installed in a fixed orientation with the swept area perpendicular to the pre dominate wind direction is called ______
Nacelle
Yaw fixed machines
Blades
Anemometer
Wind energy is harnessed as _______energy with the help of wind mill or turbine.
Solar
Electrical
Mechanical
Heat
