## Small Wind Electric Systems

### Quiz Question

 1. Small wind electric system will work for you if: ______________________. There is enough wind where you live Tall towers are allowed in your neighborhood or rural area You have enough space All of the above 2. Wind energy systems are one of the most cost-effective home-based renewable energy systems True False 3. A typical home approximately uses _____________ of electricity per year 20,000 kilowatt-hours (kWh) 10,000 kilowatt-hours (kWh) 30,000 kilowatt-hours (kWh) 40,000 kilowatt-hours (kWh) 4. “Flagging” has been used to estimate the average wind speed for an area total wind speed for an area both a & B None of the above 5. Airport wind data are generally measured at heights about 10-33 ft (3-10 m) above ground 40-66 ft (12-20m) above ground 20-33 ft (6-10 m) above ground None of the above 6. In much of the United States, wind speeds are _____________ in the summer when the sun shines brightest and longest. low high moderate None of the above 7. The formula for calculating the power from a wind turbine is: ____________ . Where, Power output is in kilowatts , Cp = Maximum power coefficient, ρ = Air density, lb/ft3 ,A = Rotor swept area, ft2 V = Wind speed -mph ,k = 0.000133, A constant to yield power in kilowatts. Power = k Cp ρ A V3 Power = k Cp 1/2 ρ A V3 Power = k Cp 1/4 ρ A V3 Power = k Cp / ρ A V3 8. AEO Stands for _________________. Actual energy output Annual energy output Average energy output None of the above 9. The ratings for wind turbines are based on standard conditions of ____ F (15° C) at sea level. 61° 58° 60° 59° 10. Small wind energy systems can be connected to the electricity distribution system. True False