Reg No. 00000CE4051219)zme:
APJ ABDUL KALAM TECHNOLOGICAL UNIVERSITY

Seventh semester B.Tech examinations (S), September 2020

Course Code: CE405
Course Name: ENVIRONMENTAL ENGINEERING- I

Max. Marks: 100 Duration: 3 Hours
PART A
Answer any two full questions, each carries 15 marks. Marks
1 പ With the help of neat sketches, explain Infiltration gallery and Infiltration well? (4)

b) Enlist any four type of pumps usually used in water supply systems and the main (5)
factors which are to be considered while selecting a suitable pump.

c) Explain logistic curve method of population forecasting? (6)
The present population of a city is 3,00,000 which was 1,70,000 twenty years ago
and it was 30,000 forty years ago. Determine the population after next 20 years
by logistic curve method?

a) Define per capita water demand? List any four major factors affecting the rate of (6)
demand of water and explain the concept of fluctuations in water demand?

b) The population statistics pertaining to a town are given below. Estimate the (6)
population expected in the year 2020 by Geometrical and incremental increase
method?

Year | 1960 | 1970 1980 | 1990 | 2000

Population 1,00,000 1,50,000 2,10,000 2,50,000

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c) Explain the significance of indicator organisms like E.coli in bacteriological (3)
analysis of water? List various methods of enumerating them.
3 a) Explain the significance and analysis of any four important physical (10)
characteristics and any six chemical characteristics of drinking water.
b) Define intake works in a water supply scheme? With the help of a neat figure, (5)
explain any one type of intake structure?
PART B

Answer any two full questions, each carries 15 marks.

4 പ Distinguish between slow sand and rapid gravity filters? (5)

b) A water treatment plant treating 50 MLD of water requires 20 mg/l of filtered (5)
alum? If this water has 5 mg/l of alkalinity as CaCO3, determine the quantity of
alum and quick lime required per day?
c) Distinguish between discrete particle settling and flocculent settling. Derive an (5)
expression for settling velocity of a discrete particle in water.
5 9) Designa mechanical rapid mix unit for treating water at the rate of 6000൩ / day. (8)
Assume a detention period of 30 seconds and velocity gradient of 600 5”

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