Question 1

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

Accepted Answer

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

Question 2

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

Accepted Answer

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

Question 3

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

Accepted Answer

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

Question 4

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

Accepted Answer

A) True 
 B)False

Question 5

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

Accepted Answer

A) True 
 B)False

Question 6

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

Accepted Answer

A) True 
 B)False

Question 7

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

Accepted Answer

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

Question 8

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

Accepted Answer

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. 
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 9

​_____ destroys lift by causing turbulence behind the blades.

Accepted Answer

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

Question 10

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

Accepted Answer

A)  ​6 mph to 40 mph 
B)  8 mph to 55 mph 
C)  ​10 mph to 60 mph 
D)  12 mph to 85 mph 
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 11

Most modern wind turbines make use of aerodynamic lift.

Accepted Answer

A) True 
 B)False

Question 12

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

Accepted Answer

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

Question 13

In the equation Power = ½ $ \rho $Av3, the $ \rho $ represents _____ .

Accepted Answer

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

Question 14

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

Accepted Answer

A) True 
 B)False

Question 15

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

Accepted Answer

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

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

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

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

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

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

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

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

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

_____ destroys lift by causing turbulence behind the blades.

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

Most modern wind turbines make use of aerodynamic lift.

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

In the equation Power = ½ $\rho$ Av³, the $\rho$ represents _____ .

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

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

Introduction to Green Building

Building Materials

Passive Solar Design

Alternative Construction

Energy

Solar Hot Water

Solar Electricity

Hydropower

Biomass

Nonsolar Renewable Energy

Filters

Exam 8: Wind Power

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

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

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

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

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

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

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

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

​_____ destroys lift by causing turbulence behind the blades.

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

Most modern wind turbines make use of aerodynamic lift.

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

In the equation Power = ½ ρ \rho ρ Av3, the ρ \rho ρ represents _____ .

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

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

Introduction to Green Building

Building Materials

Passive Solar Design

Alternative Construction

Energy

Solar Hot Water

Solar Electricity

Hydropower

Biomass

Nonsolar Renewable Energy

Filters

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

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

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

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

_____ destroys lift by causing turbulence behind the blades.

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

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

In the equation Power = ½ $\rho$ Av³, the $\rho$ represents _____ .

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