ट 10000CE405122101 Pages: 2

Reg No.: Name:
APJ ABDUL KALAM TECHNOLOGICAL UNIVERSITY

Seventh Semester B.Tech Degree Regular and Supplementary Examination December 2021 (2015 Scheme)

Course Code: CE405
Course Name: ENVIRONMENTAL ENGINEERING- I

Max. Marks: 100 Duration: 3 Hours
PARTA
Answer any two full questions, each carries 15 marks. Marks
1 a) What are the various types of water demand? (5)

b) Estimate the population of the town for the year 2051 from the following data (10)
using arithmetic increase method and geometric increase method.

Year

Population 1,00,000 1,45,000 2,00,000 2,40,000

2 a) With the help of neat sketches, explain any two types of intake structures. (10)
b) What are the factors to be considered in deciding the location of pumping stations (5)
for water treatment plant?
3 a) Explain the logistic curve method for modelling the future population of a city. (7.5)
b) Describe any five water quality parameters and the permissible limits based on (7.5)
Indian standards.
PART B
Answer any two full questions, each carries 15 marks.
4 a) Explain the theory of sedimentation. (6)
b) Design a coagulation cum sedimentation plant for supplying water to the town (9)
having a population of 1,25,000. Average per capita demand is 135
litres/day/capita. The maximum demand may be taken as 1.5 times the average
demand. Assume a detention period of 5 hours for settling tank and 30 minutes
for flocculation chamber. Flow rate can be taken as 950 litres/hour/m? of plan
area.
5 a) Explain the construction and working of a rapid gravity filter with backwashing (9)
with the help of a neat sketch.

b) Explain the advantages and disadvantages of pressure filters (6)

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