NPTEL Water and waste water treatment Week 3 Assignment Answers 2024

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NPTEL Water and waste water treatment Week 3 Assignment Answers 2024

1. What type of settling do the blocks A, B, C and D denote in the figure below.

NPTEL Water and waste water treatment Week 3 Assignment Answers 2024
  • A – Zonal settling, B – discrete particle settling, C-flocculent settling, D – Compression settling
  • A – flocculent settling, B – discrete particle settling, C- zonal settling, D – Compression settling
  • A – compression settling, B – discrete particle settling, C-flocculent settling, D – zonal settling
  • A – discrete particle settling, B – flocculent settling, C- Zonal settling, D – Compression settling
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2. In sedimentation with coagulation, generally, the detention period is …………… than that in plain sedimentation.

  • Less
  • More
  • Equal
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3. In natural flow conditions, an unpolluted river would likely to have:

  • More dissolved oxygen in summer than in winter.
  • Less dissolved oxygen in summer than in winter.
  • More or less the same amount of dissolved oxygen in winter and summer.
  • The least amount of dissolved oxygen during floods.
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4. In addressing the treatment of a daily water flow of 1200 m3 in vertical direction , a municipal corporation has identified specific parameters for a circular settling tank. The tank’s diameter is estimated at 10.78 meters, with a depth of 4 meters. Determine the overflow rate (SOR) for this circular settling tank designed for the removal of discrete suspended particles.

  • 20 m/day
  • 13 m/day
  • 25 m/day
  • 18 m/day
Answer :- 

5. Statement A: Microbiological examinations of water samples are usually based on MPN tests for the detection and enumeration of indicator organisms rather than that of pathogens.
Statement B: The identification of pathogens in water is both time consuming and difficult.

  • Both A and B are true, and B is the correct explanation of A.
  • Both A and B are true, but B is not the correct explanation of A.
  • A is true but B is false.
  • A is false but B is true.
Answer :- 

6. The figure below provides insight into the variation of the city population based on the ratio of peak hourly flow to average flow:

NPTEL Water and waste water treatment Week 3 Assignment Answers 2024
  • AB denotes the smaller community.
  • AB denotes the larger communities.
  • BC denotes the larger communities.
  • BC denotes the smaller communities.
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7. In the figure below, identify the type of treatment unit process indicated by the various blocks labeled A, B, C, D, and E.

NPTEL Water and waste water treatment Week 3 Assignment Answers 2024
  • A – Primary, B – Preliminary, C-Secondary, D – Tertiary, E – Sludge Processing
  • A – Primary, B – Preliminary, C-Secondary, D – Sludge Processing, E – Tertiary
  • A – Preliminary, B – Primary, C-Secondary, D – Sludge Processing, E – Tertiary
  • A – Preliminary, B – Primary, C-Secondary, D – Tertiary, E – Sludge Processing
Answer :- 

8. What does the presence of free ammonia in river water indicate?

  • Recent pollution of water with sewage
  • Past pollution of water with sewage
  • Intermittent pollution of water with sewage
  • No pollution of water with sewage
Answer :- 

9. In a water treatment plant, a horizontal sedimentation basin maintaining laminar flow conditions is designed to handle a flow rate of 0.45 m³/s. The basin has a rectangular shape with dimensions: length = 42 m, width = 16 m, and depth = 5.5 m. Assuming the settling velocity of particles follows Type 1 settling, calculate the removal efficiency of particles.
Given:
Diameter of particle (spherical) = 28 μm,
Particle density = 2.5 g/cm³
Density of water = 1 g/cm³,
Dynamic viscosity of water = 0.01 g/(cm.s),
Acceleration due to gravity = 980 cm/s²

  • 85%
  • 100%
  • 97%
  • 95%
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