Water Supply & Sanitation Engineering Online Test – Paper 3

1. The approximate diameter of a water mains for supplying 7.15 mld with 1.21 m/sec velocity flow will be

2. The bacteria which require free oxygen for their survival are called:

3. The presence of hydrogen sulfide in water causes:

4. The velocity of water in water mains of 40 cm diameter is usually kept

5. Which test is a must for a house sewer?

6. The SODIS method of water purification is a process of:

7. Inspection arm is provided in:

8. The term "septic" refers to.....?

9. "A right-angled sleeve (valve) connected in the water main through which water is tapped for domestic supply is called:

10. Growth of the population can be conveniently represented by

11. In an egg-shaped sewer section, the maximum discharge occurs when the depth of flow is: (where d is the total depth of the section)

12. Which one is correct?

13. Slow sand filter is efficient to remove bacteria from the raw water to an extent of:

14. The type of joint used in joining the plain ends of cast-iron pipes is

15. The water which is not chemically pure but does not contain anything harmful to human health is known as

16. The location of a well is considered good if it is sunk into

17. Purest water may have

18. Nahni trap is made of:

19. The per capita consumption of a locality is affected by

20. The valve provided after the pump in the rising mains to prevent the back flow of water when the pump is stopped is

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

22. If p is the population of a place in thousands then the fire demand of water in liters per minute, according to Kuichling formula, is given by

23. Booster pump is used for

24. Abyssinian tube well is a special type of

25. The last trap provided in a house drainage system is:

26. Goitre is due to

27. The capacity of Guheswari STP is:

28. Asbestos pipes are joined by means of

29. Water security plan is prepared:

30. PH value of water for water supply

31. The difference between a septic tank and an imhoff tank is that in an imhoff tank:

32. The capacity of a flushing cistern for water closets is:

33. A lamp hole is helpful in:

34. Pipes for water supply are tested for

35. In the partially ventilated single-stack system of plumbing, the number of vertical pipes is:

36. Imhoff tank is a:

37. The working conditions in imhoff tanks are:

38. The type of joint used in HDP pipe is

39. Pressure relief valve is provided in the water main

40. The gradient of a sewer is:

41. Sewage is treated by aerobic bacteria action in:

42. To determine the velocity of the flow of underground water, the most commonly used non-empirical formula is....formula:

43. Grit obtained in a grit chamber is used for:

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

45. Mass action' during sedimentation is the property of:

46. The depression of the water table in a well due to pumping will be maximum

47. For areas of distributed rainfall throughout the year with less intensity, the suitable system of sanitation is:

48. Grit is:

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

50. Alum increases