Water Supply & Sanitation Engineering Online Test – Paper 3

1. Self-purification of natural streams is caused due to

2. A complete water supply system includes:

3. The inlet and outlet pipes of the septic tank are bent:

4. An advantage of the intermittent system of the water supply system:

5. The factor for the selection of the pumping station site is

6. Groundwater from artesian wells

7. The maximum pressure which the pipe can withstand without any leakage during the hydrostatic pressure test is called

8. The water supply pipeline should be tested at a specified pressure for

9. The radius of influence of the well varies with

10. Where it is not possible to obtain self-cleansing velocities for sewers, flush are provided with the minimum available head of:

11. In the two-pipe system of plumbing, the number of vertical pipes is:

12. Asbestos pipes are joined by means of

13. If D is the diameter of the upper circular portion, the overall depth of a standard egg-shaped section, is:

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

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

16. Computation of discharges is difficult for:

17. The commonly used material for water supply pipes having the property of not easily corroded, strong, long life but heavy and brittle is

18. Non-scouring velocity in concrete sewer is caused by:

19. Lead in water causes

20. The maximum diameter of a sewer pipe should preferably be:

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

22. Minimum required residual head at the public tap stand is not less than

23. Pump efficiency is 85%, motor efficiency is 94% then the combined efficiency of the two is

24. Gravity conduits are generally in the form of

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

26. Steel pipes are

27. A 1 m cast iron pipe carries a discharge of 0.785 cum/sec, the velocity of flow will be

28. The valve provided at low points of the pipe to drain off water quickly under gravity is

29. Which traps have curved legs?

30. 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

31. Find the BOD with the following data: initial oxygen = 9 PPM, final oxygen = 4 PPM sewage sample 200 ml and diluted sewage = 4 ppm.

32. If 10 ml of raw sewage is diluted to 250 ml, the dilution factor is:

33. Poppet valve is a type of

34. A perched aquifer generally occurs

35. Shrouding is the process of filling gravel, bajri, etc., in

36. GI pipe coming from both sides is joined with a fitting called:

37. The maximum amount of copper in domestic water should be

38. The design discharge for the combined system shall be taken equal to:

39. Inverted siphon is called:

40. Turbidity is undesirable because it

41. Most common sources of water in hill and terai in our country are...respectively.

42. Sluice valves in main water supplies are

43. Iron and manganese are estimated by

44. Choose the odd statement:

45. True colour of water is due to

46. With the increase in the size of the water pipe, the permissible velocity (If discharge is constant)

47. Clean out is provided in the underground......sewer in place of manhole.

48. Decrease in per capita consumption occurs by

49. Turbidity is measured on..........

50. PVC pipes can withstand pressure up to