Water Supply & Sanitation Engineering Online Test – Paper 2

1. Aeration of water is done by

2. Sewer which gets discharge from two or more main sewers is called:

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

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

5. In Chezy's formula v=c√ms for calculating the velocity of flow in a circular sewer, the Chezy's constant c depends upon:

6. Minimum depth of infiltration gallery is

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

8. A sewer, which receives the discharge of a number of house sewers, is called:

9. A good source of water requiring practically least treatment is

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

11. The ratio of maximum hourly consumption and average hourly consumption of the maximum day is

12. The most widely used tube well in Nepal is

13. The best sewer material to resist hydrogen sulfide corrosion is:

14. Abyssinian tube well is a special type of

15. As the diameter of the sewer increases, the self-cleaning velocity:

16. The common pipe used in house plumbing is:

17. Selection of material for the pipe depends on

18. 2 ml of sewage, having BOD-500 mg/l, is diluted to 200 ml, and incubated for 5 days at 20°C. If the D.O. content after 5 days is found to be 5 mg/l, what was the initial D.O. content of the diluted sample?

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

20. The main pipes must be designed to carry

21. An aquiclude is

22. In the one-pipe system of plumbing, the number of vertical pipes is:

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

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

25. 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

26. When the fall in elevation is greater than 60cm, the manhole provided is called:

27. Booster pump is used for

28. The design discharge for the separate sewer system is taken equal to:

29. Sanitary sewage means:

30. The type of joint used in plastic pipe is