Sustainable Energy Technology Nptel Week 4 Answers
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Sustainable Energy Technology Nptel Week 4 Answers (July-Dec 2025)
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Question 1. Offshore wind farms face fewer issues with land acquisition and noise complaints.
a) True
b) False
Question 2. Offshore wind power generation is generally lower due to inconsistent wind patterns.
a) True
b) False
Question 3. Offshore wind installations are easier and cheaper to build and maintain than land-based installations.
a) True
b) False
Question 4. Corrosion from salty sea water is a potential problem for offshore wind turbines.
a) True
b) False
Question 5. Monopile turbines are used for deep sea installations at depths greater than 100 meters.
a) True
b) False
Question 6. Jacket/Tripod structures are installed in waters between 25 to 50 meters deep.
a) True
b) False
Question 7. Most of the land between wind turbines is directly impacted by turbine construction and cannot be used for other purposes.
a) True
b) False
Question 8. What is one major advantage of offshore wind farms?
a) They are cheaper to build than onshore wind farms
b) They have no maintenance requirements
c) They experience faster and steadier winds
d) They are not affected by storms
Question 9. Why is it more difficult to transmit electricity from offshore wind farms?
a) The turbines produce unstable electricity
b) There are no available electric cables
c) Transmission must occur over or under the sea
d) Offshore wind cannot be converted to electricity
Question 10. What is the maximum theoretical efficiency of a wind turbine in converting the kinetic energy of wind into mechanical energy?
a) 50%
b) 59.3%
c) 75%
d) 100%
These are Sustainable Energy Technology Nptel Week 4 Answers
Question 11. Which offshore wind turbine type is suitable for water depths greater than 120 meters?
a) Monopile
b) Jacket/Tripod
c) Semi-Sub
d) Spar
Question 12. If the average wind speed υavg = 8 m/s, air density ρ = 1.2 kg/m³, and the rotor swept area A = 100 m², what is the hourly average wind power? (Choose the answer closest to your calculated value)
a) 58675.2 watts
b) 42001 watts
c) 39769 watts
d) 63239.5 watts
Question 13. What is the typical power generation capacity of floating offshore wind turbine structures like TLP and Semi-Sub?
a) 1-2 MW
b) 2-3 MW
c) 5-10 MW
d) 10-20 MW
Question 14. What environmental condition contributes to corrosion of offshore wind turbines? (Select all that apply)
a) High humidity in marine environments
b) Dry desert air
c) Salty seas and salt water sprays
d) Cold temperatures
These are Sustainable Energy Technology Nptel Week 4 Answers
Question 15. If the scale parameter υ0 = 5 m/s, what is the average wind speed using the Rayleigh distribution formula? (Choose the answer closest to your calculated value)
a) 3.1 m/s
b) 5.9 m/s
c) 21.3 m/s
d) 4.43 m/s
Question 16. Which of the following is an advantage of offshore wind installations?
a) Lower capital investment
b) Fewer obstacles and less noise complaints
c) Simple installation procedures
d) Better access to land infrastructure
Question 17. Assertion (A): Wind turbines are arranged with a spacing of 10D in the direction of the prevailing wind.
Reason (R): Spacing turbines farther apart in the wind direction helps minimize wake interference and maximizes energy capture.
a) A and R are both true, and R is the correct explanation of A
b) A is true and R is false, and R is not the correct explanation of A
c) A is false, and R is true, and R is not the correct explanation of A
d) A and R are both false, and R is not the correct explanation of A
These are Sustainable Energy Technology Nptel Week 4 Answers
Question 18. What is the typical spacing between turbines in current wind farms?
a) 3D
b) 5D
c) 7D
d) 10D
Question 19. Why do wind farms require large land footprints?
a) To install more turbines
b) To avoid wake interference between turbines
c) To increase land usage
d) To reduce turbine height
Question 20. What is the average power production of a wind farm per square kilometre of land?
a) 1 MW
b) 2 MW
c) 4 MW
d) 10 MW
These are Sustainable Energy Technology Nptel Week 4 Answers