EGEE 101 Unit 8: Lesson 20 Exam
2025 Questions and Answers
What was the first form of kinetic energy? - Correct Answer✔️✔️-Wind energy
What is the main problem with worldwide wind energy? - Correct Answer✔️✔️-It is highly
variable in location and intensity.
What was wind energy used for in 5000 BC? - Correct Answer✔️✔️-Wind energy propelled boats
along the Nile River.
What was wind energy used for in 900 to 500 BC? - Correct Answer✔️✔️-Vertical-axis windmills
with woven reed sails were grinding grain in Persia and the Middle East.
What was wind energy used for in 200 BC? - Correct Answer✔️✔️-Simple windmills in China were
pumping water.
What was wind energy used for in 1000 AD? - Correct Answer✔️✔️-Spread across the European
countries -the Dutch refined the windmill and adapted it for draining lakes and marshes in the Rhine
River Delta.
What was wind energy used for in the 1800s? - Correct Answer✔️✔️-Immigrants from Europe
eventually took the wind energy technology to the Western Hemisphere.
FOR STUDY PURPOSES ONLY COPYRIGHT © 2025 ALL RIGHTS RESERVED 1
, What is wind caused by? - Correct Answer✔️✔️-By the uneven heating in the earth's surface.
Warmer air rises and cooler air moves in, creating wind blowing.
How do modern wind turbines collect energy? - Correct Answer✔️✔️-Capture kinetic energy of
the wind and extract a portion of it to generate electricity. Each wind turbine acts as a mini-power
plant with wind replacing superheated steam.
What would happen if we exploited at all available sites? - Correct Answer✔️✔️-We would move
wind penetration from 2% to perhaps 20%.
Why can a wind turbine only extract a portion of the wind's energy? - Correct Answer✔️✔️-It
would mean if 100% of the kinetic energy could be extracted, the wind velocity would be 0 mph,
which would be logically impossibility.
What is the theoretical maximum amount of wind energy that can be extracted? - Correct
Answer✔️✔️-16/27 of incoming wind energy, or 59.3%.
Known as the Betz limit.
What is the Betz limit used for? - Correct Answer✔️✔️-Betz's coefficient set the limit on how
much energy can be extracted from the wind, utility-scale wind turbines are only ever able to achieve
70%-90% of the theoretical maximum.
What are the role of turbine blades? - Correct Answer✔️✔️-To slow the wind down by reducing
its kinetic energy.
Can wind power replace coal for US electric generation? - Correct Answer✔️✔️-No, exploiting all
available sites would move from 2% to perhaps 20%.
FOR STUDY PURPOSES ONLY COPYRIGHT © 2025 ALL RIGHTS RESERVED 2
2025 Questions and Answers
What was the first form of kinetic energy? - Correct Answer✔️✔️-Wind energy
What is the main problem with worldwide wind energy? - Correct Answer✔️✔️-It is highly
variable in location and intensity.
What was wind energy used for in 5000 BC? - Correct Answer✔️✔️-Wind energy propelled boats
along the Nile River.
What was wind energy used for in 900 to 500 BC? - Correct Answer✔️✔️-Vertical-axis windmills
with woven reed sails were grinding grain in Persia and the Middle East.
What was wind energy used for in 200 BC? - Correct Answer✔️✔️-Simple windmills in China were
pumping water.
What was wind energy used for in 1000 AD? - Correct Answer✔️✔️-Spread across the European
countries -the Dutch refined the windmill and adapted it for draining lakes and marshes in the Rhine
River Delta.
What was wind energy used for in the 1800s? - Correct Answer✔️✔️-Immigrants from Europe
eventually took the wind energy technology to the Western Hemisphere.
FOR STUDY PURPOSES ONLY COPYRIGHT © 2025 ALL RIGHTS RESERVED 1
, What is wind caused by? - Correct Answer✔️✔️-By the uneven heating in the earth's surface.
Warmer air rises and cooler air moves in, creating wind blowing.
How do modern wind turbines collect energy? - Correct Answer✔️✔️-Capture kinetic energy of
the wind and extract a portion of it to generate electricity. Each wind turbine acts as a mini-power
plant with wind replacing superheated steam.
What would happen if we exploited at all available sites? - Correct Answer✔️✔️-We would move
wind penetration from 2% to perhaps 20%.
Why can a wind turbine only extract a portion of the wind's energy? - Correct Answer✔️✔️-It
would mean if 100% of the kinetic energy could be extracted, the wind velocity would be 0 mph,
which would be logically impossibility.
What is the theoretical maximum amount of wind energy that can be extracted? - Correct
Answer✔️✔️-16/27 of incoming wind energy, or 59.3%.
Known as the Betz limit.
What is the Betz limit used for? - Correct Answer✔️✔️-Betz's coefficient set the limit on how
much energy can be extracted from the wind, utility-scale wind turbines are only ever able to achieve
70%-90% of the theoretical maximum.
What are the role of turbine blades? - Correct Answer✔️✔️-To slow the wind down by reducing
its kinetic energy.
Can wind power replace coal for US electric generation? - Correct Answer✔️✔️-No, exploiting all
available sites would move from 2% to perhaps 20%.
FOR STUDY PURPOSES ONLY COPYRIGHT © 2025 ALL RIGHTS RESERVED 2
