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Reg. No. :

B.E./B.Tech. DEGREE EXAMINATION, APRIL/MAY 2011

Fifth Semester

Civil Engineering

CE 2304 — ENVIRONMENTAL ENGINEERING — I

(Regulation 2008)

Time : Three hours Maximum : 100 marks

Answer ALL questions

PART A — (10 × 2 = 20 marks)

1. What are the main objectives of treating water?

2. Enumerate the components of a water supply scheme.

3. Enlist the factors controlling the choice of materials for water conducts.

4. Mention the situation in which pumps will be connected in (a) series (b) parallel.

5. State the Stokes equation for finding settling velocity of particles.

6. On what factors does the dose of coagulants depend?

7. State the objectives of aeration process in water treatment.

8. Mention any four methods of desalination process.

9. What factor control water supply to buildings?

10. What is an equivalent pipe?

PART B — (5 × 16 = 80 marks)

11. (a) (i) Explain the factors affecting the per capita demand of a town. (8)

(ii) The population of a town Panchayat as obtained from census report is as follows.

Census year : 1965 1975 1985 1995 2005

Population : 80000 90000 100000 114000 130000

Estimate the population of the town Panchayat in 2025 by Geometric Increase method. (8)

Or

(b) (i) Describe the Mass curve analysis for the determination of impounded storage requirement for water. (8)

Question Paper Code : 11214

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11214 2

(ii) Derive an expression for determining the discharge from an unconfined aquifer under steady flow conditions. (8)

12. (a) (i) Sketch and explain the various components of a reservoir intake. (8)

(ii) Quantity of water required by a town is 20,000 m3/day. The pumps are working against a total head of 40 m, for 8 hours. Total length of the main is 20 km. f = 0.075. Determine the size of the main using Darcy-Weisbach formula. Assume any other data required. (8)

Or

(b) (i) What are the various types of joints used for the water mains? Sketch and explain any two types of joints. (8)

(ii) What is meant by economical diameter of a rising main? On what factors does it depend? (8)

13. (a) (i) Explain the sedimentation process used in water treatment plant. (8)

(ii) Sketch and explain break point chlorination. (8)

Or

(b) Find the area of rapid sand filter required for a town having a population of 80,000 with an average rate of demand 180 lpcd. Assume suitable data for design. Draw the cross section of the designed filter. (16)

14. (a) Describe the need for removal of Iron and Manganese from water. Explain the methods of removal of Iron and Manganese from water when present without combination with organic matter and in combination with organic matter. (16)

Or

(b) Sketch and explain Zeolite process for the removal of permanent hardness from water. (16)

15. (a) (i) Explain the Hardy-Cross method of distribution network analysis. (8)

(ii) Write short notes on the detection and prevention of wastage of water. (8)

Or

(b) Explain different layouts of distribution network with sketches stating their merits and demerits. (16)

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