Waste Water Engineering Online Test

1. What is the surface area of the River rock (Small) packing material used in trickling filters as the packing medium?

2. What would happen if the tube settler is inclined at an angle lesser than 45 degrees?

3. The ions with opposite charge can be exchanged.

4. Which of the following factors mentioned below marks essential for planning sewer systems for a community?

5. Which of the following indicates that the water body has been used for waste disposal?

6. While designing an HRSCC what is the detention time assumed for the draft tube?

7. Physical adsorption is also called as _________

8. What is the facility provided to stop the entry of heavy debris present in the storm water into the sewers called?

9. What is the amount spent in the UK every year because of flooding?

10. Which of these screens is used to remove secondary suspended solids?

11. What is the surface area of the plastic random packing high specific surface area packing material used in trickling filters as the packing medium?

12. What is the depth of brick masonry required in inspection chambers?

13. What is the retention time considered for the anaerobic zone for the AO process for removing phosphorus?

14. What is the thickened concentration of the primary sludge?

15. In duplex pump stations, the pumps shall be of __________

16. _______ is suited for open channel monitoring applications.

17. Which of these is not an advantage of Ozonation?

18. _________ is the removal of excess surface water from the land to enhance crop growth.

19. For which of the following reason SSMP is not used?

20. Which heavy metal is found in cooling water treatment?

21. What is the maximum number of pits considered in pit latrines?

22. Which type of mixers are used to mix coagulants like alum, ferric ammonium sulphate and coagulant aids such as polyelectrolyte and lime?

23. Wet weather flow is _________ than the dry weather flow.

24. What is the thickened concentration of the thickened sludge from the rotating biological contractor?

25. Reducing the sludge volume increases _______

26. Out of the below given methods in which of these organic matters is stabilized?

27. Which of the following is an advantage of disc filter?

28. Nitrogen fixation is the conversion of _________into nitrogen compounds.

29. The first chamber in a septic tank should be at least ______ of the total length.

30. _________ at the top prevent an outflow of the sludge blanket.

31. __________ wastewater treatment plant may or may not need the screens.

32. What is the type of pollution where the pollutants reach the water body in points called?

33. Out of the below given methods which of these produce an odour?

34. For obtaining Silica<5 ppm which of these should be utilized?

35. For plastic type high filtration rate trickling filters what would be the organic loading rate assumed?

36. Turbidity in water is caused by which of these following?

37. Which is the commonly used chelator?

38. ________ is oxidized by heterotypic micro-organisms.

39. What is the permitted concentration of arsenic in drinking water?

40. What is the flux considered while designing a reverse osmosis system for treating RO permeate?

41. Total capacity is the number of exchangeable bi-valent ions.

42. What is the retention time considered for a UASB while designing at 22-26 degree Celsius?

43. In which type of trickling filter very low power is consumed?

44. Calculate the area of the rapid sand filter for the following details.
Flow: 2000 m³/h.
Velocity: 5m/h
Backwash time: 30 mins

45. What is the angle at which the plates should be inclined in a lamella clarifier?

46. What is the WAC resin made up of?

47. ________ is provided after activated sludge process.

48. What is the diameter of the cylinder?

49. At what temperature the sludge constituting biosolids is heated, when it is treated by the pasteurization method?

50. The biofilm carrier movement is caused by ________