Question 1

​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 40E) A) and B)
F) A) and D) C

Question 2

​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 mphE) A) and C)
F) A) and D)

Question 3

​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 1,000E) A) and B)
F) B) and C)

Question 4

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.E) B) and D)
F) All of the above

Question 5

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

Accepted Answer

A) True 
 B)False

Question 6

​_____ 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 turbinesE) None of the above
F) A) and B) A

Question 7

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

Accepted Answer

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

Question 8

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 9

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%E) C) and D)
F) A) and B) B

Question 10

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 11

​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%E) A) and B)
F) A) and D)

Question 12

​_____ destroys lift by causing turbulence behind the blades.

Accepted Answer

A)   Pitching
B)   ​Angling
C)   ​Stalling
D)   ​Blade wearE) A) and B)
F) B) and C)

Question 13

Most modern wind turbines make use of aerodynamic lift.

Accepted Answer

A) True 
 B)False

Question 14

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

Accepted Answer

A) True 
 B)False

Question 15

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

Accepted Answer

A)   ​Drag
B)   ​Lift
C)   ​Pull
D)   ​FrictionE) A) and C)
F) None of the above

Exam 8: Wind Power

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

Correct Answer
verified
C

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

Correct Answer
verified

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

Correct Answer
verified

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

Correct Answer
verified

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

Correct Answer
verified

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

Correct Answer
verified
A

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

Correct Answer
verified

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

Correct Answer
verified

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

Correct Answer
verified
B

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

Correct Answer
verified

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

Correct Answer
verified

_____ destroys lift by causing turbulence behind the blades.

Correct Answer
verified

Most modern wind turbines make use of aerodynamic lift.

Correct Answer
verified

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

Correct Answer
verified

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

Correct Answer
verified

Exam 8: Wind Power

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

Correct AnswerverifiedC

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

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedA

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

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedB

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

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

​_____ destroys lift by causing turbulence behind the blades.

Correct AnswerverifiedShow Answer

Most modern wind turbines make use of aerodynamic lift.

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

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

Correct Answer
verified
C

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

Correct Answer
verified

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

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

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

Correct Answer
verified
A

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

Correct Answer
verified

Correct Answer
verified

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

Correct Answer
verified
B

Correct Answer
verified

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

Correct Answer
verified

_____ destroys lift by causing turbulence behind the blades.

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

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

Correct Answer
verified