CE-602 Environmental Engineering-I - Jun 2026 Question Paper

Under each question, How to answer lists the points an answer should cover, outlined by CampusPrep from the syllabus. Check the details against your textbook.

1. 7 Marks
   aExplain incremental Increase Method and Decreasing Rate of Growth Method for population forecasting. Compare both methods.
   How to answer

   • Define incremental increase method with formula Pn = P0 + n*xbar + n(n+1)/2*ybar
   • Define decreasing rate of growth method with percentage decrease concept
   • Steps/procedure for each method
   • Comparison on basis of assumption, accuracy, suitability for old/new cities
2. 7 Marks
   bThe following data have been noted from the census department. Calculate the probable population in the year 2021 and 2031 by using arthematic and geometric method.

   

   How to answer

   • Compute average arithmetic increase xbar from census data
   • Apply Pn = P0 + n*xbar for 2021 and 2031
   • Compute average geometric growth rate r
   • Apply Pn = P0*(1+r)^n for 2021 and 2031
3. 7 Marks
   aExplain with neat sketch and their advantages :

   1. i)Impounding Reservoir
   2. ii)Distribution Reservoir
   How to answer

   • Define impounding reservoir with neat sketch
   • List advantages of impounding reservoir
   • Define distribution reservoir with neat sketch
   • List advantages of distribution reservoir
4. 7 Marks
   bCompare the differences between centrifugal and displacement type pumps.
   How to answer

   • Define centrifugal pump working principle
   • Define displacement pump working principle
   • Compare on head, discharge, efficiency, maintenance
   • Suitability for water supply applications
5. 7 Marks
   aDescribe the design principles and working of Coagulation and Flocculation Units with neat sketches.
   How to answer

   • Principle of coagulation and flocculation with chemical dosing
   • Design criteria: detention time, velocity gradient, basin dimensions
   • Working with neat sketches of units
   • Factors affecting efficiency
6. 7 Marks
   bExplain the following water treatment units :

   1. i)Flash Mixer
   2. ii)Clariflocculator
   3. iii)Tube Settler
   How to answer

   • Function and working of flash mixer
   • Function and working of clariflocculator
   • Function and working of tube settler
   • Role in sedimentation and clarification
7. 7 Marks
   aWhat is the purpose served by aeration? List any four methods of aeration.
   How to answer

   • Define aeration and its purposes: CO2 removal, oxidation, taste and odour removal
   • List four methods: cascade, spray, air diffusion, trickling
   • Brief working of each method
   • Advantages in water treatment
8. 7 Marks
   bExplain the physical, chemical and biological characteristics of drinking water. Mention desirable limits according to BIS standards.
   How to answer

   • List physical characteristics: turbidity, colour, taste, temperature
   • List chemical characteristics: pH, hardness, chlorides, iron
   • List biological characteristics: coliform, pathogens
   • Mention BIS desirable limits for key parameters
9. 7 Marks
   aExplain the conservancy and water carriage system
   How to answer

   • Define conservancy system with features
   • Define water carriage system with features
   • Comparison on hygiene, cost, water requirement
   • Suitability and current practice
10. 7 Marks
    bDescribe the construction and working with neat sketches of following :

    1. i)House Sewer Connection
    2. ii)Catch Basin
    3. iii)Manhole
    How to answer

    • Construction and working of house sewer connection with sketch
    • Construction and working of catch basin with sketch
    • Construction and working of manhole with sketch
    • Function of each in sewerage system
11. 7 Marks
    aDiscuss various methods of sewage treatment. Explain Primary, Secondary and Tertiary Treatment.
    How to answer

    • Overview of sewage treatment stages
    • Explain primary treatment: screening, sedimentation
    • Explain secondary treatment: biological processes
    • Explain tertiary treatment: nutrient removal, disinfection
12. 7 Marks
    bBriefly explain about BOD and COD.
    How to answer

    • Define BOD with test conditions
    • Define COD with test method
    • Significance in sewage strength assessment
    • Difference between BOD and COD
13. 7 Marks
    aWhat are the factors affecting the selection of materials for sewer construction?
    How to answer

    • Strength, durability and chemical resistance
    • Hydraulic smoothness, water-tightness, cost
    • Availability, handling and maintenance
    • Effect of sewage gases and soil loads
14. 7 Marks
    bWhat are the different Fluctuation is sewage flow?
    How to answer

    • Define seasonal, daily and hourly fluctuations
    • Causes: water consumption pattern, infiltration, storm
    • Peak factors and minimum flow concept
    • Effect on sewer design
15. 7 Marks
    aWrite short notes on any two :

    1. i)Rainwater Harvesting
    2. ii)Water Conservation
    3. iii)Reuse and Recycling of Wastewater
    How to answer

    • Rainwater harvesting: concept, methods, benefits
    • Water conservation: need, measures
    • Reuse and recycling of wastewater: treatment and applications
    • Sketches/flow where relevant for any two
16. 7 Marks
    bWhat is disinfection? Explain break point chlorination.
    How to answer

    • Define disinfection and its objectives
    • Explain chlorination chemistry and break point curve
    • Stages: chloramine formation, destruction, free residual
    • Significance of break point chlorination