Water Supply & Sanitation Engineering Online Test

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Vikash chaudhary

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Total Questions: 30
Time Allotted: 30 minutes
Passing Score: 50%
Randomization: Yes
Certificate: No
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1 / 30

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

a) drain valve

b) blow-off valve

c) sewer valve

d) all of the above

2 / 30

2. The types of joint not used to resist shock, vibration, etc. is

a) dresser coupling joint

b) victaulic joint

c) flanged joint

d) flexible joint

3 / 30

3. The main function of a manhole is:

a) cleaning of sewer

b) inspection of sewer

c) joining different types of sewer

d) joining different grade of sewer

4 / 30

4. The minimum height of a flushing cistern is:

a) 1 m

b) 2 m

c) 3 m

d) 5 m

5 / 30

5. Stoneware pipes are generally not used for sewer mains because they are:

a) weak in compression

b) weak in tension

c) hydraulically less efficient

d) less resistant to organic corrosion

6 / 30

6. Gravity conduits

a) carry water under gravity

b) follow the hydraulic gradient line

c) are carried through tunnels in deep cutting

d) all of the above

7 / 30

7. Which type of distribution system will you follow if the reduced level of the source of water is 100 m while the reduced level of the town is 50 m?

a) gravity system

b) pumping system

c) dual system

d) none of the above

8 / 30

8. The gradient to be provided for sewers depends upon:

a) the diameter of the sewer

b) the discharge

c) sewer pipe material

d) all of the above

9 / 30

9. The self-cleaning velocity normally adopted for a sewer is:

a) less than 1 m/sec

b) 1.0 m/sec to 1.2 m/sec

c) 1.5 m/sec to 1.2 m/sec

d) more than 2.0 m/sec

10 / 30

10. PH value of water for water supply

a) 6.5 to 8.5

b) 5.5 to 7.0

c) 7.0 to 9.5

d) 5.5 to 9.5

11 / 30

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

a) main sewer

b) trunk sewer

c) outfall sewer

d) lateral sewer

12 / 30

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

a) 5.00-7.00

b) 7.00-12.00

c) 12.00-17.00

d) 17.00-19.00

13 / 30

13. Drop manholes are provided on sewers in:

a) hilly towns

b) plain towns

c) manholes are deep

d) none of the above

14 / 30

14. Methemoglobinemia (Blue babies) is due to

a) oxidation of hemoglobin

b) nitrates replacing oxygen in hemoglobin

c) nitrites replacing oxygen in hemoglobin

d) carbon monoxide replacing oxygen in hemoglobin

15 / 30

15. The flow in the sewers is minimum during which hours?

a) Night

b) Morning

c) Day

d) Evening

16 / 30

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

a) low

b) steep

c) maximum (i.e., vertical)

d) zero

17 / 30

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

a) 1

b) 2

c) 3

d) 4

18 / 30

18. Which one is a waterborne virus infection?

a) malaria

b) cancer

c) dysentery

d) jaundice

19 / 30

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

a) water test

b) air test

c) compaction test

d) smoke test

20 / 30

20. The interference of the well depends upon

a) the number of wells

b) spacing between wells

c) types of wells

d) all of the above

21 / 30

21. Coefficient of permeability is maximum for

a) clean gravel

b) clay

c) fine sand

d) silt

22 / 30

22. Septic tanks are best suited for:

a) municipalities

b) industries

c) scattered residences

d) congested areas

23 / 30

23. The amount of BOD in domestic water should be

a) 1 ppm

b) 2 ppm

c) 3 ppm

d) nil

24 / 30

24. Digesters are used for:

a) the sludge digestion under optimum conditions

b) the sludge digestion under normal conditions

c) the sludge digestion under extreme conditions

d) none of the above

25 / 30

25. Which one is a waterborne disease?

a) malaria

b) cancer

c) dysentery

d) encephalitis

26 / 30

26. Break pressure tank in a water supply system is incorporated to:

a) Store water under pressure

b) Treat water by adequate pressure

c) Release the pressure generated in the pipe

d) Break the pressure

27 / 30

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

a) below 0.5 m/sec

b) below 5 m/sec

c) below 1.8 m/sec

d) below 18 m/sec

28 / 30

28. Minimum depth of infiltration gallery is

a) 2 m

b) 3 m

c) 4 m

d) 5 m

29 / 30

29. The average discharge of a tube-well is about

a) 5 liters/sec

b) 50 liters/sec

c) 100 liters/sec

d) 500 liters/sec

30 / 30

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

a) q-trap

b) floor trap

c) nahni trap

d) interception trap

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