Water Supply & Sanitation Engineering Online Test – Paper 3

1. Poppet valve is a type of

2. A tube well of 38cm diameter has depths before and after pumping at 10.7 m and 4.60, respectively. The coefficient of permeability is 2273 liters per day. If the radius of the circle of influence is 304.8m. The yield from the tube well will be

3. A flight sewer is provided when the gradient is:

4. As per Buston's formula, fire demand for in liters per minute for a population of p in thousands, is given by

5. The diameter of pipes in bathrooms and lavatories in domestic water supply is:

6. The curve showing the level of water in a well and the original water table is known as

7. The amount of BOD in domestic water should be

8. Manhole is said to be shallow if its depth is less than:

9. Water for domestic consumption should be:

10. Two sewer sections laid at the same grade will be hydraulically equivalent if:

11. The relation between porosity, specific yield, and specific retention is given by

12. The types of pipe which are generally laid vertically due to low strength is

13. What will happen if an induction motor pump is run under significantly low voltage continually?

14. Sewer has to bear:

15. Goitre is due to

16. Septic tanks are best suited for:

17. The asbestos cement pipes are generally laid

18. A goose neck is:

19. Odour is measured in terms of...

20. A septic tank is a watertight tank where the following operation(s) take place:

21. The minimum water flow in a tap stand is:

22. The gradient of a sewer is:

23. Detention time for the detritus tank is:

24. Excess concentration of magnesium salts in water causes

25. The coverage of water supply in Nepal as per the census of 2011 is

26. Copper pipes are

27. Pressure relief valve is provided in the water main

28. According to the guidelines of DWSS, the maximum number of users in each stand post should be:

29. The sewage in an inverted siphon will flow under what condition?

30. The common pipe used in house plumbing is:

31. Which of the following impurities in water is removed by the sedimentation process?

32. PH value of water for water supply

33. Scour valves are provided

34. Water demand for public use as compared to the total demand, kept in the design of waterworks for a city, is

35. The main function of a manhole is:

36. The factor to be considered for the source of water supply is:

37. The peak water consumption hours as recommended by the Department of Water Supply and Sewerage (DWSS) is.... hours.

38. A lamp hole is helpful in:

39. Which metal is good for keeping drinking water?

40. Sewage is treated by aerobic bacteria action in:

41. Widely used pipe for rural water supply in Nepal is:

42. If in the relative stability test on sewage, the period of incubation at 20°C is 15 days, the relative stability is:

43. The process of obtaining energy for their (bacteria) synthesis after the oxidation of organic or inorganic matter is called

44. Imhoff tank is a:

45. Sterilization is the process of

46. The working chamber of a manhole, along the direction of flow should have a minimum length for depth more than 0.8m:

47. The open channels supported above the ground over trestles are called

48. The slope of the hydraulic grade line is always towards the well due to pumping. This line of depressed water table is called

49. The minimum diameter of a sewer pipe should be:

50. Inspection arm is provided in: