CE-602 Environmental Engineering -I - Jun 2025 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
   aOver the two periods, each of 20 years population of a town increased from 30000 to 170000 to 300000. Find:

   1. i)Saturation population
   2. ii)Coefficients of logistic equation
   3. iii)Expected population in next 20 years
   4. i)Saturation population
   How to answer

   • State logistic growth equation and saturation population formula
   • Calculate saturation population from three censuses
   • Determine logistic coefficients a and b
   • Predict population after next 20 years
2. 7 Marks
   bDiscuss various factors that affect the water demand.
   How to answer

   • Define water demand and its types
   • Discuss climatic, population, economic and social factors
   • Explain effect of pressure, metering, and water quality
   • Conclude with significance for design
3. 7 Marks
   aDesign coagulation cum sedimentation tank for a population of 1 lakh persons with a water supply of 150 lpcd. Assume any other suitable data required.
   How to answer

   • Estimate total water requirement for 1 lakh at 150 lpcd
   • Assume detention time, overflow rate and velocity
   • Calculate tank dimensions, number of units and hopper
   • Check design criteria and provide sketch
4. 7 Marks
   bWhat is disinfection? Explain break point chlorination.
   How to answer

   • Define disinfection and its objectives
   • Explain chlorination chemistry and breakpoint curve
   • Describe stages: chloramine, destruction, free residual
   • State significance for safe water supply
5. 7 Marks
   aCompare the design and working feature of slow sand filter and rapid sand filter.
   How to answer

   • Outline construction of slow and rapid sand filters
   • Compare filtration rate, media size and cleaning
   • Compare operation, efficiency and cost
   • Summarize suitability for different supplies
6. 7 Marks
   bWith the help of sketches, discuss about the layouts of distribution systems.
   How to answer

   • List dead-end, grid-iron, ring and radial layouts
   • Provide neat sketches of each layout
   • Discuss advantages, disadvantages and applications
   • Mention suitability for towns and pressure requirements
7. 7 Marks
   aWrite in detail about the water quality standards.
   How to answer

   • List physical, chemical and bacteriological standards
   • Give permissible limits as per IS 10500 / WHO
   • Explain importance of pH, turbidity, hardness, etc.
   • Mention sampling and compliance
8. 7 Marks
   bWrite briefly about sewer appurtenances.
   How to answer

   • Define sewer appurtenances
   • Describe manholes, inlets, catch basins and traps
   • Explain flushing tanks, inverted siphons and outfalls
   • State functions and locations
9. 7 Marks
   aWhat do you mean by variation inflow of sewage? Explain average flow, dry weather flow and maximum flow.
   How to answer

   • Define sewage flow variations
   • Explain average, dry weather and maximum flow
   • Discuss peak factors and diurnal variation
   • State design significance
10. 7 Marks
    bDiscuss advantage and disadvantage of soda lime process and ion exchange methods of water softening.
    How to answer

    • Outline soda-lime and ion-exchange softening reactions
    • List advantages of each method
    • List disadvantages/limitations and costs
    • Compare sludge, operation and suitability
11. 7 Marks
    aDifferentiate between storage and service reservoirs. Explain unit operations.
    How to answer

    • Define storage vs service reservoirs
    • Differentiate location, function and capacity
    • Define unit operations with examples
    • Explain role in treatment train
12. 7 Marks
    bWrite a note on distribution reservoirs. Where are these located? How do you determine the storage capacity of balancing reservoir by mass curve method for 24 hours pumping?
    How to answer

    • Define distribution and balancing reservoirs and locations
    • Explain mass curve method procedure
    • Describe determination of storage for 24-hr pumping
    • Mention demand vs supply curve interpretation
13. 7 Marks
    aCompute the fire demand for a city having a population of 1,40,000 using.

    1. i)Kuichlings formula
    2. ii)Bostons formula
    How to answer

    • State Kuichling and Boston fire demand formulas
    • Substitute population 1,40,000 in each formula
    • Compute fire demand in L/min or MLD
    • Compare results
14. 7 Marks
    bWrite short notes on :

    1. i)Coli form Index and E-coli
    2. ii)Most Probable Number (MPN)
    How to answer

    • Define coliform index and E-coli significance
    • Explain MPN test procedure and table
    • Mention presumptive, confirmed and completed tests
    • State limits for drinking water
15. 7 Marks
    aWhy are coagulants used in waste treatment? List various coagulants used in the process.
    How to answer

    • Explain need for coagulation in waste treatment
    • Describe destabilization and floc formation
    • List alum, ferric salts and polyelectrolytes
    • Mention dosing and mixing
16. 7 Marks
    bExplain activated sludge treatment in detail.
    How to answer

    • Define activated sludge process
    • Describe aeration tank, secondary clarifier and recycle
    • Explain F/M ratio, MLSS and sludge age
    • State advantages and operational issues