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 best sewer material to resist hydrogen sulfide corrosion is:

a) RCC

b) brick masonry

c) glazed stoneware

d) asbestos cement

2 / 30

2. The working conditions in imhoff tanks are:

a) aerobic only

b) anaerobic only

c) aerobic in the lower and anaerobic in the upper compartment

d) anaerobic in the lower and aerobic in the upper compartment

3 / 30

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

a) copper

b) concrete

c) asbestos cement

d) cast iron

4 / 30

4. Gastrointestinal irritation is produced because of excess of the following in water

a) chlorides

b) sulphates

c) nitrates

d) phosphates

5 / 30

5. A circular section of sewer has the advantage of:

a) least parameter for a given area

b) offers the least opportunities for deposits

c) more suitable when the discharge is approximately constant

d) all of the above

6 / 30

6. Booster pump is used for

a) water supply

b) sewage pumping

c) pressure increase

d) drinking purposes

7 / 30

7. 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

8 / 30

8. Before entering a manhole, a candle is lowered into the manhole:

a) to illuminate it

b) to detect toxic gases

c) to give a signal to the adjacent manhole

d) to find out the presence of oxygen

9 / 30

9. 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

10 / 30

10. 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

11 / 30

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

a) breakdown reserve

b) fire reserve

c) all of the above

d) balancing reserve

12 / 30

12. Pressure relief valve is provided to prevent

a) the increase of pressure after a certain limit

b) back flow when the pump is stopped

c) the water flowing out of the suction pipe

d) none of the above

13 / 30

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

a) 1.2

b) 1.5

c) 1.8

d) 2.7

14 / 30

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

a) 2.5 to 3.0 m/sec

b) 2.5 to 3.5 m/sec

c) 1.5 to 2.5 m/sec

d) 0.6 to 1.2 m/sec

15 / 30

15. Manhole is said to be medium if its depth is between:

a) 0.7-0.9 m

b) 0.9-1.2 m

c) 0.9-1.3 m

d) 0.9-1.5 m

16 / 30

16. The detention time in a septic tank is usually:

a) 1-2 hours

b) 5-6 hours

c) 18-24 hours

d) 22-24 hours

17 / 30

17. For a 150mm diameter sewer, the gradient required to generate self-cleaning velocity is:

a) 1 in 10

b) 1 in 100

c) 1 in 200

d) 1 in 300

18 / 30

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

a) quantity and quality of available water

b) elevation of the sources of water

c) general terrain intervening the area

d) all of the above

19 / 30

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

a) thermometer

b) tintometer

c) turbidity meter

d) barometer

20 / 30

20. Pressure relief valve is provided in the water main

a) to reduce the pressure

b) upstream of the sluice

c) at the low point

d) all of the above

21 / 30

21. The head developed in a centrifugal pump, at zero discharge is known as

a) low head

b) high head

c) medium head

d) shut off head

22 / 30

22. Sanitary sewage means:

a) domestic sewage

b) industrial sewage

c) both (a) and (b) above

d) none of the above

23 / 30

23. Which is the oldest waterworks in Nepal?

a) Bhim Dhara scheme

b) Bir Dhara scheme

c) Sundarijal scheme

d) Dudh Pokhari scheme

24 / 30

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

a) centrifugal

b) hydraulic ram

c) reciprocating

d) rotary

25 / 30

25. Water demand of a city includes

a) domestic water demand

b) commercial and industrial demand

c) fire and public-use demand

d) all of the above

26 / 30

26. 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

27 / 30

27. Inverted siphon is called:

a) depressed sewer

b) sag sewer

c) both of the above

d) none of the above

28 / 30

28. A source of colour in water is due to

a) silt

b) clay

c) organic debris

d) inorganic inert matter

29 / 30

29. Highly colored waters are

a) unaesthetic

b) highly polluted

c) require elaborate

d) rich in iron and manganese.

30 / 30

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

a) 0.7-0.9 m

b) 1.0-1.2 m

c) 0.8 m

d) 0.7 m

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