JNTU
JNTU B.Tech III WATER SUPPLY ENGINEERING Previous Question Paper (July/August - 2023 - R16)
Note: i) Question paper consists of Part A, Part B. ii) Part A is compulsory, which carries 25 marks. In Part A, Answer all questions. iii) In Part B, Answer any one question from each unit. Each question carries 10 marks and may have a, b as sub questions.
Part A
What is design period? How is it decided?
Answer
The design period is the future time frame for which a water supply scheme is planned and designed to meet the projected population demand. It is decided based on factors such as the useful life of the components, ease of future expansion, availability of funds, and the anticipated rate of population growth.
List 4 water borne diseases along with causative agent.
Answer
Four common water-borne diseases and their causative agents are:
- Cholera: Vibrio cholerae
- Typhoid fever: Salmonella typhi
- Dysentery: Shigella species
- Giardiasis: Giardia lamblia
What is optimum dose of coagulant?
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What is Zeta potential? Show a sketch.
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What is negative head in filters? How is it controlled?
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What is residual chlorine? Why is it required?
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What is dual system in water distribution? List advantages.
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How is fire reserve estimated? Explain.
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What are the effects of Fe and Mn in drinking water? How are they removed?
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Write note on removal of algae.
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Part B
Using data given below, estimate the population of a town in 2021, 2031 and 2041 by incremental increase and geometric increase methods. Comment on the suitable method.
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Discuss the factors influencing percapita water demand.
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Sketch a river intake and list the ideal requirements of an intake structure.
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Present the effects of following water quality parameters if present in drinking water. Also give their Indian drinking water standards: i) Total hardness ii) Nitrates iii) Flurides iv) Arsenic.
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Give a flow chart indicating the sequence of units in drinking water treatment plant. State their objectives.
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Design a plain sedimentation tank for city assuming per capita demand as 135 lpcd and population as 8,00,000. Take peak factor as 2.5.
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Explain the mechanisms responsible for coagulation.
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Present a comparison between aluminium and iron salts as coagulants. List their limitations.
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With help of a sketch indicating the valve locations, explain the functioning of backwash mechanism in RSF.
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For the same data given in the Problem 4 (b), design a RSF and state the assumptions used.
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Describe the various types of chlorination indicating the applicability of each method.
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Explain the advantages and disadvantages of ozone and UV disinfection.
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Discuss various methods of water distribution and suggest a system for your town. Substantiate your selection by giving reasons.
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A town with population of 150000 is to supply water @ 150lpcd. Using the demand pattern given in table, find the storage capacity of distribution reservoir if pumping is done from 10PM to 4AM daily.
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Explain in detail how Hardy Cross method is used for pipe network analysis.
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Present a detailed comparison between Branched and Looped networks.
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Explain different methods of aeration used in water treatment.
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What is hardness, explain the methods used for removal of hardness.
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Explaining the problems caused by colour, outline the methods adopted for removal of color in drinking water.
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With help of sketches, explain the working principles of reverse osmosis and adsorption.
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