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 underground structure in the form of a circular or rectangular tank for the purpose of admitting sewerage into it from the intercepting chamber is called:

a) Soak pit

b) septic tank

c) Cesspool

d) privy pit

2 / 30

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

a) their discharge capacity when running full is equal

b) their flow velocity when running full is equal

c) their flowing areas when running full are equal

d) all the above factors are equal

3 / 30

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

a) 180 PPM

b) 320 PPM

c) 200 PPM

d) 250 PPM

4 / 30

4. Mass curve is used for the determination of

a) area of reservoir

b) depth of reservoir

c) capacity of reservoir

d) all of the above

5 / 30

5. For an insignificant effect on the water table, the tube wells are spaced as one in every

a) 0.5 sq km

b) 1.0 sq km

c) 1.5 sq km

d) 2.0 sq km

6 / 30

6. If the head of water is more than 100 m then the type of pipe used is

a) plastic

b) HDP

c) GI

d) PVC

7 / 30

7. The distribution mains in a water supply system are designed for

a) maximum daily demand

b) peak hourly demand

c) average daily demand

d) maximum hourly demand on the maximum consumption day

8 / 30

8. In distribution pipes, drain valves are provided at

a) lower point

b) higher point

c) junction points

d) anywhere

9 / 30

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

a) working pressure

b) test pressure

c) design pressure

d) none of the above

10 / 30

10. A heavy metal having non-toxic property

a) lead

b) copper

c) zinc

d) silver

11 / 30

11. An egg-shaped section of sewer:

a) is economical than a circular section

b) is more stable than a circular section

c) provides self-cleansing velocity at low discharge

d) all of the above

12 / 30

12. Water security plan is prepared:

a) For consumptive use

b) For long-term minimization of hazards and risks

c) For quality water storage and uses for different purposes

d) For community participation

13 / 30

13. When more than two sewers join in a manhole:

a) their tops should be at the same level

b) their centers should be at the same level

c) their bottoms should be at the same level

d) they can be either way

14 / 30

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

a) air relief valve

b) reflux valve

c) sluice valve

d) all of the above

15 / 30

15. Flush air inlets are sometimes called:

a) ventilated lamp holes

b) well hole

c) clean outs

d) flushing tank

16 / 30

16. Letache is observed in:

a) septic tank

b) sewage

c) landfill

d) none of the above

17 / 30

17. The minimum height of a flushing cistern is:

a) 1 m

b) 2 m

c) 3 m

d) 5 m

18 / 30

18. The sewage in an inverted siphon will flow under what condition?

a) Air

b) Vacuum

c) Pressure

d) Gravity

19 / 30

19. The water supply demand in a day school without a boarder should be

a) 10 lpcd

b) 20 lpcd

c) 30 lpcd

d) 40 lpcd

20 / 30

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

a) dry weather flow

b) 2x dry weather flow

c) 4x dry weather flow

d) 6x dry weather flow

21 / 30

21. The water carriage sewage system:

a) is cheaper in initial cost than dry conveyance system

b) requires treatment before disposal

c) creates a hygienic problem

d) all of the above

22 / 30

22. The velocity of flow does not depend on:

a) grade of sewer

b) hydraulic mean depth of sewer

c) roughness of sewer

d) length of sewer

23 / 30

23. A lamp hole is helpful in:

a) illuminating sewer line

b) cleaning sewer line

c) repairing

d) testing sewers

24 / 30

24. 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:

a) 0.16 mg/l

b) 4 mg/l

c) 10 mg/l

d) 100 mg/l

25 / 30

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

a) house sewer

b) lateral sewer

c) intercepting sewer

d) sub-main sewer

26 / 30

26. 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

27 / 30

27. The layout of the distribution system that is suitable for haphazardly growing cities is:

a) dead-end system

b) grid iron system

c) ring system

d) radial system

28 / 30

28. Infiltration gallery is a

a) horizontal well

b) vertical well

c) inclined well

d) none of the above

29 / 30

29. Total quantity of reservoir is the sum of the following

a) breakdown reserve

b) fire reserve

c) all of the above

d) balancing reserve

30 / 30

30. 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

a) d.p / 2t

b) d.p / t

c) d.t / 2p

d) d.t / p

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