Wastewater Treatment and Recycling Nptel Week 2 Answers
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Wastewater Treatment and Recycling Nptel Week 2 Answers (July-Dec 2025)
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Question 1. Identify the correct statements regarding estimation of municipal wastewater quantity in a city:
Statement I: Quantity of municipal wastewater is typically estimated based on number of inhabitants.
Statement II: It also depends on general water use practices of inhabitants in the city.
a) Statement I is correct, while statement II is incorrect
b) Statement II is correct, while statement I is incorrect
c) Both, statements I and II are correct
d) Both, statements I and II are incorrect
Question 2. For designing a sewage management system, design population depends on:
a) Per capita sewage generation
b) Capacity of Sewage Treatment Plant
c) Fluctuations in water demand
d) Design period
Question 3. Population forecasting method, which assumes constant percentage growth of population, is:
a) Growth Composition Analysis Method
b) Incremental Increase Method
c) Geometric Increase Method
d) Logistic Growth Method
These are Wastewater Treatment and Recycling Nptel Week 2 Answers
Question 4. Dry weather flow is accounted:
a) Only in separate sewers
b) Only in combined sewers
c) In both, separate and combined sewers
d) Neither in separate sewers, nor in combined sewers
Question 5. The ratio of maximum sewage flow to average sewage flow is known as:
a) Attenuation rate
b) Peak factor
c) Normalized sewage flow rate
d) Cumulative design index
Question 6. Match the parameters in first column with their attributes given in the second column:
Parameters for sewer design
(i) Design population
(ii) Design period
(iii) Design capacity
Attributes for Estimation/Prediction
A. Considers fluctuation in water uses
B. Requires historical data for estimation
C. Can not be estimated scientifically
a) (i)-B, (ii)-C, (iii)-A
b) (i)-C, (ii)-A, (iii)-B
c) (i)-C, (ii)-B, (iii)-A
d) (i)-A, (ii)-C, (iii)-B
Question 7. Which of the following population forecasting method assume progressively increasing or decreasing growth rate of population:
a) Incremental Increase Method
b) Arithmetic Increase Method
c) Geometric Increase Method
d) Logistic Growth Method
Question 8. For a city, having water supply as 750 MLD with 100% coverage, which of the following appears a reasonable estimate for sewage generation per day?
a) 900 MLD
b) 650 MLD
c) 400 MLD
d) 250 MLD
These are Wastewater Treatment and Recycling Nptel Week 2 Answers
Question 9. What is the average daily sewage flow for the city?
a) 176 MLD
b) 264 MLD
c) 352 MLD
d) 528 MLD
Question 10. What is the maximum daily sewage flow for the city?
a) 176 MLD
b) 264 MLD
c) 352 MLD
d) 528 MLD
Question 11. The average incremental increase in the population per decade is (in Lakhs/decade)
Question 12. The decadal percentage growth rate of population is (in %)
These are Wastewater Treatment and Recycling Nptel Week 2 Answers
Question 13. The forecasted population in 2051 using geometric increase method, would be (in Lakhs)
Question 14. The forecasted population in 2051 using arithmetic increase method, would be (in Lakhs)
Question 15. The estimated average daily flow of sewage from the city in 2051, considering population forecasted using arithmetic increase method, would be (in MLD)
These are Wastewater Treatment and Recycling Nptel Week 2 Answers