Water Supply Engineering Questions and Answers pdf
1. The fire demand of a city may be worked out by
A. Kuichling’s formula
B. Freeman formula
C. Bustan’s formula
D. All the above
Answer: Option D
2. Mathamoglobinemia or blue baby disease is caused due to
A. Chlorides
B. Nitrites
C. Nitrates
D. Sulphides
Answer: Option C
3. Acidity in water is caused due to
A. Mineral acids
B. Free CO₂
C. Aluminium sulphate
D. All the above.
Answer: Option D
4. The specific retention is least in case of
A. Clay
B. Sand
C. Silt
D. Coarse gravel.
Answer: Option D
5. Time of concentration
A. is the time taken, for precipitation
B. duration of rainfall.
C. time taken for all the ran off to reach the drain
D. time taken for the storm water to travel from the most remote point to the drain.
Answer: Option D
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6. The R.L. of ground water table on the sides of a valley is 1505 m whereas R.L. of the stream water is 1475 m. If 60° slope consists of pervious soil between R.L. 1485 m to 1500 m, the gravity spring may be expected at the point of reduced level
A. 1500 m
B. 1505 m
C. 1475 m
D. 1485 m
Answer: Option D
7. Average annual rainfall at any station is the average of annual rainfall over a period of
A. 14 years
B. 21 years
C. 28 years
D. 35 years
Answer: Option D
8. While determining the yield of open wells by the pumping test
A. Velocity of recharging water, increases with depression head
B. Depression head resulting at critical velocity, is called critical depression head
C. Working head is generally limited to ?rd of the critical depression head
D. Maximum safe yield of an open well, is expected at critical depression head
Answer: Option D
9. According to IS : 1172-1963, a minimum of 135 litres of water capita per day, is required for
A. Boarding schools
B. Nurses home and medical quarters
C. hostels
D. all the above
Answer: Option D
10. If four fires break out in a city of population 40 lakhs and if each hydrant has three streams and duration of each fire is four hours, the total quantity of water required, is
A. 1880 kilo litres
B. 2880 kilo litres
C. 3880 kilo litres
D. 4880 kilo litres
Answer: Option B
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11. For the prediction of future population of a city, the factor to be considered, is
A. Births
B. Deaths
C. Migrants
D. All the above
Answer: Option D
12. The factor affecting per capita demand, is
A. size of the city
B. climatic conditions
C. cost of water
D. all the above
Answer: Option D
13. By boiling water, hardness can be removed if it is due to
A. calcium sulphate
B. magnesium sulphate
C. calcium nitrate
D. calcium bicarbonate
Answer: Option D
14. In slow sland filters, the turbidity of raw water can be removed only up to
A. 60 mg/litre
B. 75 mg/litre
C. 100 gm/litre
D. 150 mg/litre
Answer: Option A
15. When the reduced level of the water source is higher than the reduced level of the consumer's place, water is
A. By pumping system
B. By gravitational system
C. Both (A) and (B)
D. All the above
Answer: Option B
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16. To pump water from a water reservoir 3 m deep and maximum water level at 135 m, a pump is installed to lift water up to R.L. 175 m at a constant rate of 36,00,000 litres per hour. If the length of the pipe is 1506 m and f =0.01, ignoring other minor losses and assuming the economical diameter from Lea's formula D = 1.2 √Q, the water horse power of the pump is
A. 400
B. 450
C. 500
D. 600
Answer: Option D
17. The process of passing water through beds of granular materials, is called
A. Screening
B. Sedimentation
C. Filtration
D. None of these
Answer: Option C
18. Surcharge storage zone of a reservoir, is
A. Below dead storage
B. Between dead storage and useful storage
C. Above useful storage
D. Also known as valley storage
Answer: Option C
19. Pick up the correct statement from the following:
A. Water with hardness up to 75 ppm is considered soft
B. Water with hardness more than 200 ppm is considered hard
C. Water needed for laundries should contain hardness less than 75 ppm
D. All the above
Answer: Option D
20. Surge tanks are used
A. for storage water
B. to increase the velocity in a pipeline
C. as overflow valves
D. to guard against water hammer
Answer: Option D
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21. Biochemical Oxygen Demand (B.O.D.) of safe drinking water must be
A. nil
B. 5
C. 10
D. 15
Answer: Option A
22. For determining the velocity of flow of underground water, the most commonly used non-empirical formula is
A. Darcy’s formula
B. Slichter’s formula
C. Hazen’s formula
D. Lacy’s formula
Answer: Option A
23. Aeration of water is done to remove
A. odour
B. colour
C. bacterias
D. hardness
Answer: Option A
24. Disinfection of drinking water, is done to remove
A. odour
B. bacterias
C. turbidity
D. colour
Answer: Option B
25. Specific capacity or yield of wells, is generally expressed, as
A. m³/sec
B. m³/hour
C. m³/hour/m²
D. m³/hour/m²/m
Answer: Option D
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26. The least thickness of class B cast iron (spun) pipe, is
A. 7.2 mm
B. 7.9 mm
C. 8.6 mm
D. 10 mm
Answer: Option C
27. The maximum depth of sedimentation tanks is limited to
A. 3 m
B. 4 m
C. 5 m
D. 6 m
Answer: Option D
28. Corrosion of well pipes may not be reduced by
A. reducing the draw down and the pumping rate
B. reducing the flow velocity
C. using thicker pipes
D. using screens having larger area of openings
Answer: Option D
29. Pick up the incorrect statement from the following. The underground sources of water, is from
A. wells
B. springs
C. infiltration wells
D. storage reservoirs
Answer: Option D
30. Pick up the correct statement from the following:
A. The water level in a still well, represents the ground water table level
B. The difference between water table level and the water level in a well after pumping, is called depression head
C. The surface of water table surrounding a well during pumping, forms a cone of depression
D. All the above
Answer: Option D
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31. If the chosen diameter of a pipe, is less than the economical diameter
A. Cost of pipe will be less
B. Head loss will be high
C. Cost of pumping will be more than saving
D. All the above
Answer: Option D
32. Turbidity of raw water is a measure of
A. Suspended solids
B. Acidity of water
C. B.O.D
D. None of these
Answer: Option A
33. The expected discharge to be obtained from an open well sunk in coarse sand is 0.0059 cumec. If the working depression head of the well is 3 m, the minimum diameter of the well, is
A. 2 m
B. 2.25 m
C. 2.50 m
D. 3.00 m
Answer: Option D
34. In distribution pipes, drain valves are provided at
A. lower point
B. higher point
C. junction points
D. any where
Answer: Option A
35. Asbestos pipes are
A. light in weight and easy to transport
B. highly resistant to corrosion
C. very much smooth and hydraulically efficient
D. all the above
Answer: Option D
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36. As per IS : 1172-1963, water required per head per day for average domestic purposes, is
A. 65 litres
B. 85 litres
C. 105 litres
D. 135 litres
Answer: Option D
37. Pick up the correct statement from the following:
A. The water level in a still well, represents the ground water table level
B. The difference between water table level and the water level in a well after pumping, is called depression head
C. The surface of water table surrounding a well during pumping, forms a cone of depression
D. All the above
Answer: Option D
38. Sunlight
A. helps growth of bacterias
B. impedes growth of algae
C. increases dissolved oxygen content
D. reduces turbidity
Answer: Option B
39. In pressure supply mains, water hammer pressure is reduced by providing
A. Sluice valves
B. Air valves
C. Pressure relief valves
D. None of these
Answer: Option C
40. In centrifugal pump installation,
A. Pump is properly primed before starting
B. The diameter of the pipe at inlet as well as at outlet, is kept smaller than the delivery pipe
C. The motor may burn out if it is started with empty delivery pipe and with open gate valve
D. All the above
Answer: Option D
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