Water Supply & Sanitation Engineering Online Test – Paper 3

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

2. Per capita water demand is calculated in liters

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

4. Thrash rack/roughing filter is provided at the entrance of

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

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

7. The pump does not require any power, energy, fuel, etc., for its working is

8. Kidney damage may be caused due to excess concentration of

9. What will be the daily per capita water demand for a city of 0.2 million people whose total water requirement per annum is 19,710,000 cubic meters?

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

11. Sterilization is the process of

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

13. The hourly variation factor is generally taken

14. In distribution pipes, drain valves are provided at

15. Growth of the population can be conveniently represented by

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

17. Disinfection of water involves.....

18. HGL should always be...... above the GL

19. Grade aqueducts are not allowed to run

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

21. The sewer pipes:

22. The colour of water is measured on the platinum cobalt scale with the help of

23. A circular section for a sewer is preferred only up to a diameter of:

24. Dyspepsia (Indigestion) is caused due to

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

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

27. Size of colloidal particles present in water is

28. The specific gravity of sewage is:

29. The alum, when mixed with water as a coagulant...... PH value of water.

30. True colour of water is due to

31. Abbreviation which is correct?

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

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

34. Service connections to consumer houses are generally provided with

35. Normally the shape of the demand line is

36. If 10 ml of raw sewage is diluted to 250 ml, and the dissolved oxygen content of the diluted sample changes from 9 mg/l to 5 mg/l after incubation at 20°C. for 5 days, BODs of raw sewage is:

37. The aquifer having the least water-bearing capacity is

38. Dug wells or open wells

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

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

41. An aquiclude is

42. The pressure at the inlet and outlet in a break pressure tank is

43. PH value is a symbol for....material:

44. Selection of material for the pipe depends on

45. Choose the odd statement:

46. If P is the total internal pressure, d is the diameter of the pressure conduit, and t is the thickness of the conduit, the hoop's stress is

47. The main function of a manhole is:

48. A lamp hole is helpful in:

49. PH value of water for water supply

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