B.TECH - Semester 5 environmental engineering 1 Question Paper 2021 (mar)
Practice authentic previous year university questions for better exam preparation.
- (a) A circular sedimentation tank fitted with standard mechanical sludge removal equipment is to handle 3.5 million litres per day of raw water. What is the diameter of the tank if the detention time is 5 hrs and the depth of the tank is 3 m .
- (a) Explain in detail the mechanisms of filtration.
- (b) What are the operational problems encountered in rapid sand gravity filters. How are they avoided? OR
- (a) What is aeration of water? Discuss in detail the different methods of aeration of water.
- (b) Discuss the various forms in which chlorine can be applied to water as a disinfectant.
- 502 : ENVIRONMENTAL ENGINEERING - I (C) (2013 Scheme) Time : 3 Hours Max. Marks : 100 Instructions : Assume any missing data suitably. PART - A Answer all questions.
- What is sampling? Explain the steps involved in the river water sampling.
- Explain principle of sedimentation.
- List the advantages and disadvantages of centrifugal pump.
- Explain any one method of softening of water.
- Draw a neat sketch of the layout of a conventional water treatment plant. ( $5 \times 4=20$ Marks) Answer any one question from each module.
- (a) Give the maximum permissible limits as per the BIS for the following water quantity parameters.
- (i) Fluoride (ii) Iron (iii) Total hardness (iv) Nitrate. Also indicate their health significance.
- (b) Find the settling velocity of a discrete particle in water when Reynolds number is less than 0.5 . The diameter of particle is 0.05 mm and specific gravity is 2.65 . The kinematic viscosity of water at $20^{\circ} \mathrm{C}$ is $1.01 \times 10^{-2} \mathrm{~cm}^{2} / \mathrm{sec}$.
- Estimate the domestic water requirements with per capita demand 200 lpcd for a city in the year 2040 by projecting population of the city by (a) Arithmetical increase method
- Estimate the domestic water requirements with per capita demand 200 lpcd for a city in the year 2040 by projecting population of the city by (b) Geometrical increase method
- (b) Describe how a jar test is performed and describe its importance in plant operation.
- Estimate the domestic water requirements with per capita demand 200 lpcd for a city in the year 2040 by projecting population of the city by (c) Incremental increase method | Year | 1960 | 1970 | 1980 | 1990 | 2000 | | :--- | :---: | :---: | :---: | :---: | :---: | | Population | 2379862 | 4697832 ...
- (a) What are intake structures? List various types of intakes and discuss in detail any two of them.
- (b) What is meant by variations in the rate of water demand? What are the effects of these variations on the design of water supply scheme.
- (c) Write a short note on "Fire Demand" in water supply.
- (a) Explain the Nalogonda technique of defluoridation of water with a neat sketch.
- (b) Discuss treatment of water by reverse osmosis method
- Write short notes on : (a) Microfiltration
- Write short notes on : (b) Ultrafiltration and
- Write short notes on : (c) Nanofiltration.
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