Sustainable Energy Technology Nptel Week 3 Answers
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Sustainable Energy Technology Nptel Week 3 Answers (July-Dec 2025)
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Question 1. Largest untapped hydro power potential lies in Africa.
a) True
b) False
Question 2. The largest growth of hydropower in the world over the last 50 years has been in China.
a) True
b) False
Question 3. Hydropower can generate power uniformly at its rated capacity throughout the year.
a) True
b) False
Question 4. Reaction turbines operate while completely submerged in water.
a) True
b) False
Question 5. Pelton turbines are most suitable for mountain stream, with low volumes of flow rate and high heads.
a) True
b) False
Question 6. Francis turbines are most suitable for high volume flow rate and very low head of water.
a) True
b) False
Question 7. Pumped hydro storage energy cannot be converted to hydropower.
a) True
b) False
Question 8. Impulse turbines are more suited to large hydro-power plants.
a) True
b) False
Question 9. Which of the turbine types has highest specific speed?
a) Cross flow turbine
b) Kaplan turbine
c) Francis turbine
d) Pelton turbine
These are Sustainable Energy Technology Nptel Week 3 Answers
Question 10. Which renewable energy technology has seen the highest annual power capacity addition as of 2020?
a) Solar PV
b) Wind power
c) Hydropower
d) Bio-power, geothermal, ocean power, CSP
Question 11. Which renewable energy technology has seen the maximum reduction in the levelized cost of electricity from 2010 to 2020?
a) Solar PV
b) On-shore wind power
c) Off-shore wind power
d) Geothermal energy
Question 12. The typical number of nozzles in a Pelton turbine is:
a) 3
b) 5
c) 7
d) 9
Question 13. Water from a river flows at a rate of 80 m³/s down a smooth pipe falling 60 m into a turbine. How much power is available from this turbine?
(density of water = 1000 kg/m³, select the value closest to your answer)
a) 7 MW
b) 47 MW
c) 107 MW
d) 147 MW
Question 14. The rated capacity of a wind farm is given as 700 KW. Over an entire year, the wind farm generates 3679 MW·hr of electrical energy. Calculate the full load hours (closest value).
a) 5085 hrs
b) 9060 hrs
c) 5255 hrs
d) 8760 hrs
Question 15. The radius of a Pelton wheel is 2 m and the water net head is 80 m. To maximize power, what should be the angular velocity (rad/s) of the Pelton wheel?
(consider g = 10 m/s²)
a) 1 rad/s
b) 10 rad/s
c) 50 rad/s
d) 100 rad/s
Question 16. The maximum capacity of a wind farm is given as 700 KW. Over an entire year, the wind farm generates 3679 MW·hr of electrical energy. What is its capacity factor? (closest value)
a) 0.2
b) 0.4
c) 0.6
d) 0.8
These are Sustainable Energy Technology Nptel Week 3 Answers
