Deck 8: Wind Power

Question 1

After many variations and refinements, wind turbines _____ efficiency at converting wind energy into electricity.​

A) ​still do not exceed 25%
B) can now exceed 50%
C) offer 75%​
D) provide 15%-35%

Answer 1

B

Question 2

​The best turbines today capture _____ of the wind's power.

A) ​at least 75%
B) approximately 25%
C) no more than 33%
D) ​more than 50%

Answer 2

D

Question 3

Most modern wind turbines make use of aerodynamic lift.

Answer 3

True

Question 4

​A row of 25-foot-tall trees can produce turbulence unsuitable for wind turbines _____ feet away.

A) ​up to 100
B) ​more than 500
C) up to 350​
D) more than 1,000

Question 5

​_____ must face into the wind to produce power and, therefore, require some mechanism to constantly realign the rotor during changes in wind direction.

A) Horizontal-axis wind turbines
B) Vertical-axis wind turbines
C) ​Multidirectional-axis wind turbines
D) ​Diagonal-axis wind turbines

Question 6

Small wind turbines do not offer a valuable source of energy for off-grid homes or farms.

Question 7

​_____ destroys lift by causing turbulence behind the blades.

A) Pitching
B) ​Angling
C) ​Stalling
D) ​Blade wear

Question 8

The amount of power captured by a wind turbine is significantly more than the amount of power available in wind.

Question 9

​Moderate wind speeds _____ mph provide suitable power without overfatiguing components.

A) ​at least 5
B) ​gusting up to 30
C) ​in the range of 10-40
D) ​sustained at 40

Question 10

In the equation Power = ½ Av³, the represents _____ .

A) rotor area
B) kinetic energy
C) wind speed
D) ​density of air

Question 11

​Operational wind speeds typically extend from _____ in residential-scale turbines.

A) ​6 mph to 40 mph
B) 8 mph to 55 mph
C) ​10 mph to 60 mph
D) 12 mph to 85 mph

Question 12

All types of wind turbines require high-quality wind to generate electricity.

Question 13

Propellers created during World War I were used to make the first wind turbines, which generated electricity rather than milling grain or pumping water.

Question 14

Which of the following statements is true regarding commercial wind power?

A) ​It takes five years to offset the embodied energy of wind turbine construction.
B) ​Commercial wind power takes more time to implement than other renewable energy forms.
C) ​The environmental impact and impact on farming and ranching operations is significant.
D) ​Commercial wind power is currently the least expensive form of renewable energy.

Question 15

_____ is the force of the air colliding with a surface.​

A) ​Drag
B) ​Lift
C) ​Pull
D) ​Friction