Subject 2018 Question Paper — Government College of Engineering and T…
The 2018 Subject previous year question paper (Government College of Engineering and Technology, Jammu), with every question and its marks.
- University: Government College of Engineering and Technology, Jammu
- Course: CIVIL ENGINEERING—COURSE NO. PCE-505 (Environment Engineering)
- Branch: CIVIL ENGINEERING
- Year: 2018
- Paper: end-term
- Duration: 180 minutes
- Total marks: 100
Instructions
- Attempt five questions in all, selecting at least two questions from each module.
- All questions carry equal marks.
- Assume missing data, if any, suitably.
Questions
Module-I
- Q1(a). Compute the population of the year 2000 and 2006 for the city whose population in the year 1930 was 25,000 and in the year 1970 was 47,000. Make use of geometric increase method. [15 marks]
- Q1(b). Mention and discuss the factors that influence the per capita demand. [5 marks]
- Q2(a). The population of 5 decades from the year 1930 to 1970 is given below. Find out the population after one, two and three decades beyond the last known decade, by using the arithmetic increase method : Year Population 1930 25,000 1940 28,000 1950 34,000 1960 42,000 1970 47,000 [10 marks]
- Q2(b). Write a short note on the layout of distribution systems which are commonly used in India. [10 marks]
Module-II
- Q3(a). A water works has to purify the water for a town whose daily demand is $9 \times 10^6$ liters per day. Design the suitable sedimentation tank of the water works fitted with mechanical sludge remover. Assume the velocity of flow in the sedimentation tank as 22 cm/minute and the detention period as 8 hours. [10 marks]
- Q3(b). Write short notes on : (i) Mixing devices (ii) Flocculation (iii) Clarifiers. [10 marks]
- Q4(a). Enumerate the various surface sources of water. Discuss the comparative its quality and quantity of water supplies that may be available from these sources. [10 marks]
- Q4(b). What is chemical coagulation ? Explain the various stages in carrying out sedimentation by chemical coagulation. [10 marks]
Module-III
- Q5(a). Design the section of a combined circular sewer from the following : Area to be served = 150 hectares Population of the locality = 50,000 Maximum permissible velocity = 3.2 m/s Time of entry = 5 mins Time of flow = 20 mins Rate of water supply = 270 l/d/capita Impermeability factor = 0.45 [15 marks]
- Q5(b). Discuss about indicator organisms. [5 marks]
- Q6(a). If three days $20^\circ\text{C}$ BOD of a sewage sample is 250 mg/l, what will be its 5 days $30^\circ\text{C}$ BOD. [10 marks]
- Q6(b). Explain the importance of determination of solids in sewage. How do you determine the suspended solids in a given solid in the given sample of waste ? [10 marks]
Module-IV
- Q7(a). Define sludge volume index. What is its importance in sewage treatment ? [10 marks]
- Q7(b). Sketch and explain the type of aeration system in activated sludge process. [10 marks]
- Q8(a). Sketch the conventional sequence of unit operations in a completed municipal sewage treatment plant. [10 marks]
- Q8(b). Explain the basic difference between the primary treatment, secondary treatment and tertiary treatment. [10 marks]