# NPTEL Wastewater Treatment And Recycling Week 2 Assignment Answer 2023

NPTEL Wastewater Treatment And Recycling Week 2 Assignment Answer 2023:- All the Answers provided below to help the students as a reference, You must submit your assignment at your own knowledge.

## NPTEL Wastewater Treatment And Recycling Week 2 Assignment Answer 2023

1. The quantity of municipal wastewater generated from a city depends on:

a. Population of the city
b. Water consumption pattern of the inhabitants
c. Both, population and water consumption pattern
d. Neither population nor the water consumption pattern

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2. Dry Weather Flow is:

a. The actual flow of sanitary sewage
b. The stormwater contribution to sewers in dry season
c. Combined stormwater flow plus sanitary sewage flow
d. Quantity of sanitary sewage flow subtracted from stormwater flow

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3. Identify the correct statements regarding design capacity of sewer systems:
Statement I:
Incorrect estimation of the quantity of sewage generated may lead to
inadequate or hydraulically inefficient sewer system design.
Statement II: Under-estimation of the design sewage flow will make the system uneconomical.

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

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4. Design period of various sewerage components are usually based on:

a. Availability of funds for design
b. Useful life of the specific components
c. The duration of the sewerage services required
d. Average life of the sewerage facility

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5. Which of these population forecasting method is likely to overestimate the forecasted population for a city of moderate size and age:

a. Arithmetic Increase Method
b. Incremental Increase Method
c. Geometric Increase Method
d. Logistic Growth Method

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6. Using Growth Composition Analysis Method (Demographic Method), population is estimated based on annual birth rate, death rate and migration rates. Which of these is relatively the most difficult to estimate:

a. Birth rate
b. Death rate
c. Migration rate
d. All of the above

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7. The peak factor is used to estimate peak for sewer designs. The correct relation between peak factor for sewage flow estimation with the increase in population, is:

a. Peak factors have large fluctuations for highly populated cities
b. Peak factor is independent of population increase
c. Peak factor typically increased with the increase in population.
d. Peak factor typically decreases with the increase in population.

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8. Population forecast in a logistic growth model is limited by the:

a. Availability of the master plan of the region
b. Exponential growth rate of the population
c. Migration rate of the population
d. Population carrying capacity of region

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9. As per CPHEEO Manual (20212), the conventional sewers shall be designed for a minimum sewage flow of:

a. 30 litres per capita per day
b. 55 litres per capita per day
c. 100 litres per capita per day
d. 250 litres per capita per day

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10. Which of the these may lead to additional inflow to sewer lines?

a. Water used from unaccounted private water supplies
b. Water used for gardening and horticulture
c. Water losses from water supply systems
d. All of the above

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Question Statement (11-13):
The population of a city was recorded as 2.5 lakhs, 3.2 lakhs, 4.1 lakhs, and 5.2 lakhs in
1991, 2001, 2011, and 2021, respectively. Based on the data, answer the following:

11. The forecasted population in 2041 using arithmetic increase method, would be (in Lakhs)

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12. The parameter is incorrect.Image size is not supported. Each image dimension must be between 40 and 2600 pixels.

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13. The forecasted population in 2041 using arithmetic increase method, would be (in Lakhs)

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14. A city with 12 lakh populations receives 150 lped water supply. Assuming that 80% of the water used is received as municipal sewage, the maximum daily flow of sewage from the city, assuming a daily peak factor of 2, would be:

a. 360 MLD
b. 288 MID
c. 180 MLD
d. 72 MLD

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15. The average daily sewage flow from city is 16 MLD. Assuming daily and hourly peak factor as 2 and 1.5, respectively, the maximum (peak) hourly flow of the sewage would be:

a. 172 m°/h
b. 768 m3д
c. 1240 m’h
d. 2000 m3д

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