JNTU
JNTU B.Tech III Year ENVIRONMENTAL ENGINEERING Previous Question Paper (November/December - 2017 - R15)
Note: This question paper contains two parts A and B. Part A is compulsory which carries 25 marks. Answer all questions in Part A. Part B consists of 5 Units. Answer any one full question from each unit. Each question carries 10 marks and may have a, b, c as sub questions.
Part A
Distinguish between confined and unconfined aquifer.
Answer
An unconfined aquifer has its upper surface (water table) open to the atmosphere, whereas a confined aquifer is overlain by an impermeable confining layer (aquitard or aquiclude) that keeps the water under pressure.
Mention the drinking water standard for nitrates, what is bluebaby syndrome?
Answer
The permissible limit for nitrates in drinking water is 45 mg/L. Blue baby syndrome (methemoglobinemia) is a condition in infants caused by high nitrate intake, which reduces the blood's ability to carry oxygen, leading to cyanosis (bluish skin discoloration).
Define the term disinfection.
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What is the laboratory test for determination of optimum dosage of coagulant?
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Define C.O.D.
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Write the purpose of manholes as sewer appurtenances.
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What is the role of screens in sewage treatment?
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Distinguish between ASP and Tricking filter.
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What is meant by sewage farming?
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Write the algal bacterial symbiosis in oxidation pond.
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Part B
Explain population forecasting methods.
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What is an intake structure? With a neat sketch, describe reservoir intake.
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Distinguish between slow sand filter and rapid sand filter.
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Explain the theory of chlorination.
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For disinfecting water supply, it is required to treat 500000 litres of daily supply with 0.5 ppm of chlorine. If the disinfectant is available in the form of bleaching powder containing 30% of available chlorine, calculate the amount of bleaching powder required to treat the daily flow of water.
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A main sewer is to be designed to receive a flow from 1 square kilometre area of a community where the population density is 200 persons per hectare. The average sewage flow is 150 lpcd. What is the design flow for the main sewer?
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What are the materials used for pipe sewers? Write their merits and demerits.
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Explain the process involved in a trickling filter.
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Explain the methods of aeration.
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Explain self purification of streams with the aid of a neat sketch.
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Design a septic tank for a small colony of 100 persons with daily sewage flow of 135 litres per head per day.
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