Water Supply Engineering Quiz | Water Supply Engineering Objective Type Questions and Answers

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Questions
21 The fire demand of a city may be worked out by
A Kuichling's formula
B Freeman formula
C Under Writers formula
D All the above

Answer: All the above
22 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: 2880 kilo litres
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23 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: time taken for the storm water to travel from the most remote point to the drain.
24 Average annual rainfall at any station is the average of annual rainfall over a period of
A 35 years
B 21 years
C 7 years
D 14 years

Answer: 35 years
25 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 2.75 m
B 3.00 m.
C 2 m
D 2.50 m

Answer: 3.00 m.
26 Sunlight
A helps growth of bacterias
B impedes growth of algae
C increases dissolved oxygen content
D reduces turbidity

Answer: impedes growth of algae
27 Disinfection of drinking water, is done to remove
A odour
B bacterias
C turbidity
D colour

Answer: bacterias
28 Pick up the incorrect statement from the following. The underground sources of water, is from
A storage reservoirs
B infiltration wells
C wells
D springs

Answer: storage reservoirs
29 The factor affecting per capita demand, is
A size of the city
B climatic conditions
C pressure in water mains
D all the above.

Answer: all the above.
30 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 1485 m.
B 1475 m
C 1500 m
D 1505 m

Answer: 1485 m.
31 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: all the above.
32 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: 8.6 mm
33 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: Darcy's formula
34 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: calcium bicarbonate
35 The maximum depth of sedimentation tanks is limited to
A 6 m.
B 2 m
C 4 m
D 3 m

Answer: 6 m.
36 Asbestos pipes are
A light in weight and easy to transport
B highly resistant to corrosion
C high flexible to accommodate deflection upto 12°
D all the above

Answer: all the above
37 Water supply includes
A collection, transportation and treatment of water
B distribution of water to consumers
C provision of hydrants for fire fighting
D all the above

Answer: all the above
38 Turbidity of raw water is a measure of
A suspended solids
B acidity of water
C B.O.D.
D none of these

Answer: suspended solids
39 The population growth curve is
A S-shaped curve
B parabolic curve
C circular curve
D straight line

Answer: S-shaped curve
40 Manholes along the mains from the source to a city are provided at 500 m intervals in
A steel pipes
B R.C.C. pipes
C hume steel pipes
D all the above

Answer: all the above

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