Showing posts with label Water Supply Engineering Questions. Show all posts
Showing posts with label Water Supply Engineering Questions. Show all posts

Water Supply Engineering Questions (W6)

In this post, I will share some important questions which are frequently asked in competitive examinations such as SSC, UPSC and state PSCs.




  1. Priming of a centrifugal pump is necessary...


    1. If it is located above reservior level
    2. If it is located below reservior level
    3. If it is located at reservior level
    4. If delivery head is high

    View Answer
    Answer: a

  2. The pipe joint commonly used in puming station is


    1. flexible joint
    2. expansion joint
    3. flanged joint
    4. socket and spigot joint

    View Answer
    Answer: c

  3. If the diameter of the main pipe is taken less than economical diameter then ...


    1. head loss will be high
    2. cost of pipe will be high
    3. cost of pumping will be more
    4. all of the above

    View Answer
    Answer: d

  4. As per IS:10500-2012, the acceptable limit of pH of Drinking water is ...


    1. 6.5-8.5
    2. 6.0-8.0
    3. 7.0-7.5
    4. 6.0-7.0

    View Answer
    Answer: a

  5. As per IS:10500-2012, what are the acceptable limit and permissible limit of "Floride" in Driking water in mg/l?


    1. 1.5 and 1.0 respectively
    2. 1.0 and 1.5 respectively
    3. 1.0 and 1.0 respectively
    4. 1.5 and 1.5 respectively

    View Answer
    Answer: b

  6. As per IS:10500-2012, the permissible limit of "Nitrate" in mg/l is ...


    1. zero
    2. 45
    3. 0.45
    4. 4.5

    View Answer
    Answer: a

  7. As per IS:10500-200, the permissible limit of total hardness as $CaCO_3$ in mg/l is ...


    1. 200
    2. 400
    3. 600
    4. 800

    View Answer
    Answer: c

  8. The disease "Meathaemoglobinaemia" is caused when drinking water supply contains high concentrations of...


    1. Fluoride
    2. Iron
    3. Nitrite
    4. Nitrate

    View Answer
    Answer: d

  9. The micro-organism group E-coli is used as an indicator of faecal contamination of water because ...


    1. E-Coli is a known pathogen
    2. it is very easy to detect
    3. they are discharged along with faeces in large numbers
    4. all of the above

    View Answer
    Answer: c

  10. Pathogenic organisms may be found in contaminated waters and are responsible for diseases like ...


    1. typhoid fever
    2. infectious hepatitis
    3. gastro enteritis
    4. all of the above

    View Answer
    Answer: d






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Water Supply Engineering Questions (W5)

In this post, I will share some important questions which are frequently asked in competitive examinations such as SSC, UPSC and state PSCs.




  1. The joint on cast iron pipes for water supply are generally


    1. flanged
    2. welded
    3. spigot and socket (turned and bored)
    4. spigot and socket (lead)

    View Answer
    Answer: d

  2. The valve, which allows the flow only in one direction, is a:


    1. reflux valve
    2. sluice valve
    3. gate valve
    4. none of the above

    View Answer
    Answer: a

  3. The valve, which is provided in the water distribution pipes at street corners and pipe junctions to control the flow in the distribution system, is:


    1. an air valve
    2. a sluice valve
    3. a scour valve
    4. a reflux valve

    View Answer
    Answer: b

  4. A check valve is also known as a:


    1. relief valve
    2. reflux valve
    3. blow off valve
    4. none of the above

    View Answer
    Answer: b

  5. A sluice valve is also known as:


    1. air-inlet valve
    2. scour valve
    3. gate valve
    4. none of the above

    View Answer
    Answer: c

  6. Pressure relief valves installed along water mains maybe provided for relieving:


    1. air pressure
    2. water hammer pressure
    3. ice pressure
    4. all of the above

    View Answer
    Answer: b

  7. Anchorages in water pipelines are provided:


    1. at all bends
    2. at all steep slopes
    3. at other points of unbalanced pressure
    4. all of the above

    View Answer
    Answer: d

  8. Scour valves are provided:


    1. at the street corners to control the flow
    2. at the dead ends to drain out the wastewater
    3. at every summit of the rising main
    4. at the foot of the rising main along the slope, to prevent back running of water

    View Answer
    Answer: b

  9. A blow-off valve is provided in a water distribution system, at:


    1. low points
    2. high points
    3. junction points
    4. all of the above

    View Answer
    Answer: a

  10. Summits are the point of:


    1. high pressures
    2. low pressures
    3. equal pressures
    4. none of the above

    View Answer
    Answer: b






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Water Supply Engineering Questions (W4)

In this post, I will share some important questions which are frequently asked in competitive examinations such as SSC, UPSC and state PSCs.





  1. The internal pressure, to which a water supply pipe is subjected to, is:


    1. full hydrostatic pressure when water in the pipe is at rest
    2. pressure head and velocity head in the pipe, when flow at full velocity is taking place
    3. (a) + water hammer pressure
    4. (b) + water hammer pressure

    View Answer
    Answer: c
    The maximum internal pressure likely to come under worst circumstances is usually taken equal to the sum of full static pressure and the water hammer pressure.

  2. The hoop tension, needing steel reinforcement along the circumference of a water supply conduit, is caused by:


    1. internal pressure due to water in the pipe
    2. water hammer pressure
    3. pressure due to tafficload
    4. both (a) and (b)

    View Answer
    Answer: d

  3. Pick up the incorrect statement.


    1. water hammer pressure is caused by opening and closing of gates, valves, pumps, etc. situated along a water main
    2. water hammer pressure is caused only momentarily
    3. the greater the haste with which a gate valve is opened or closed on a water main, the greater will be the water hammer pressure developed
    4. none of the above

    View Answer
    Answer: d

  4. Water hammer pressures can be reduced by using:


    1. fast closing valves
    2. slow closing valves
    3. critically closing time valves
    4. none of the above

    View Answer
    Answer: b

  5. The water supply mains, normally need meticulous design, to withstand:


    1. compressive stresses
    2. tensile stresses
    3. flexural stresses
    4. all of the above

    View Answer
    Answer: b

  6. The maximum pressure, which a pipe can withstand without any leakage, during hydrostatic pressure test, is called the:


    1. working pressure
    2. test pressure
    3. design pressure
    4. hydrostatic pressure

    View Answer
    Answer: b

  7. The commonly used material for water mains, which is strong, non corrodable, very durable but heavy and brittle is:


    1. RCC
    2. Steel
    3. copper
    4. cast iron

    View Answer
    Answer: d

  8. As compared to the cast iron pipes, steel water pipes are:


    1. heavier
    2. stronger
    3. durable
    4. all of the above

    View Answer
    Answer: b

  9. Steel pipes are:


    1. easily affected by acidic and alkaline atmosphere effects
    2. unable to withstand high negative pressures
    3. liable to quick rusting
    4. all of the above

    View Answer
    Answer: d

  10. Cast iron pipes, which are cast in horizontal position by ordinary sand moulding process, are called:


    1. Pit cast pipes
    2. Delavaud pipes
    3. Sand spun pipes
    4. Mcwane pipes

    View Answer
    Answer: b






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Water Supply Engineering Questions (W3)

In this post, I will share some important questions which are frequently asked in competitive examinations such as SSC, UPSC and state PSCs.





  1. The devices, which are installed for drawing water from different water sources, are called:


    1. Filters
    2. Intakes
    3. Outlets
    4. Inlets

    View Answer
    Answer: b

  2. Pick up the incorrect statement.


    1. The intake point should, as far as possible, be located in deep waters
    2. The intake point should be located upstream of the point of sewage disposal
    3. The intake point on the meandering rivers, should preferably be located on the convex banks
    4. None of the above

    View Answer
    Answer: c
    The intake point on the meandering rivers, should preferably be located on the concave banks

  3. Simple submerged intakes may be suitable to:


    1. large water supply projects on rivers
    2. small water supply projects on streams
    3. small water supply projects on lakes
    4. both (b) and (c)

    View Answer
    Answer: d
    Small submerged intakes are used for small water supply projects drawing water from streams or lakes having relatively little change in water surface elevation throughout the year.

  4. Dry intake towers, when compared to wet intake towers, need:


    1. heavier and costly construction
    2. lighter and cheaper construction
    3. practically the same section

    View Answer
    Answer: a

  5. Pick up the incorrect statement.


    1. dry intake towers are preferred to wet intake towers
    2. wet intake towers help in withdrawing water from different levels of a storage reservoir
    3. a medium sized river intake well can preferably be adopted, when the water is withdrawn from the upstream of a barrage
    4. none of the above

    View Answer
    Answer: b

  6. Pressure pipes are exclusively used for carrying water supplies, because:


    1. such pipes are closed, and hence not exposed to pollution anywhere, enroute
    2. since the water runs under pressure in these pipes, pollution from outside surrounding cannot find entry, even if some joits are loose
    3. such pipes can go up and down the hills and valleys, thus requiring lesser length
    4. all of the above

    View Answer
    Answer: d

  7. The velocity in water conduit is normally kept between:


    1. 0.5 and 1.0 m/s
    2. 0.8 and 1.2 m/s
    3. 0.9 and 1.5 m/s
    4. 1.0 and 1.5 m/s

    View Answer
    Answer: c

  8. Which of the following formula is most appropriate to design pressure pipes?


    1. Darcy Weisbach formula
    2. Manning's formula
    3. Chezy's formula
    4. Dupit's formula

    View Answer
    Answer: a

  9. In the design of water supply conduits, the larger value of the design velocity, if adopted will:


    1. reduce the cost of the pipe
    2. increase the cost of pumping
    3. both (a) and (b)
    4. none of the above

    View Answer
    Answer: c

  10. The appropriate diameter of a water main for supplying $9 MLD$ of water with a velocity of $1.5 m/s$, is:


    1. 0.3 m
    2. 0.6 m
    3. 0.9 m
    4. 1.0 m

    View Answer
    Answer: a
    $9 MLD=9000 {m^3}/day = \frac{9000}{24 \times 3600}$
    $=0.104167 {m^3/sec}$
    $Volume = Area \times velocity$
    $0.104167 = \pi \times radius^2 \times 1.5$
    $radius = 0.15 m$
    $diameter = 0.3 m$






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Water Supply Engineering Questions (W2)

In this post, I will share some important questions which are frequently asked in competitive examinations such as SSC, UPSC and state PSCs.





  1. Design period for the distribution system of a water scheme is ...


    1. 10 years
    2. 15 years
    3. 25 years
    4. 30 years

    View Answer
    Answer: d
    As per GOI manual on water supply,


  2. As compared to the geometrical increase method of forecasting population, the arithmetical increase method gives:


    1. lesser value
    2. higher value
    3. equal value
    4. may vary, as it may depend on the population figures

    View Answer
    Answer: a

  3. The suitable method for forecasting population for a young and a rapidly growing city is:


    1. arithmetic mean method
    2. geometric mean method
    3. comparative graphical method
    4. none of the above

    View Answer
    Answer: b

  4. The suitable method for forecasting population for an old developed large city is:


    1. arithmetic mean method
    2. geometric mean method
    3. comparative graphical method
    4. none of the above

    View Answer
    Answer: a

  5. Which of the following represents the growth of the population curve?


    1. semi-log curve
    2. straight line curve
    3. logistic curve
    4. exponential curve

    View Answer
    Answer: c

  6. The per capita consumption of a locality is affected by:


    1. climate condition
    2. quality of water
    3. distribution pressure
    4. all of the above

    View Answer
    Answer: d

  7. Factor affecting, prediction of the future population of a city is


    1. births
    2. deaths
    3. migrations
    4. all of the above

    View Answer
    Answer: d

  8. Water demand for public use as compared to total demand, kept in the design of water works for a city is


    1. 5 %
    2. 10 %
    3. 15 %
    4. 20 %

    View Answer
    Answer: a

  9. Which source of water, among the following, is not a surface source?


    1. river
    2. well
    3. lake
    4. ocean

    View Answer
    Answer: b

  10. The average annual rainfall of a country is a figure, which is averaged over a period of:


    1. 10 years
    2. 15 years
    3. 35 years
    4. 100 years

    View Answer
    Answer: c






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Water Supply Engineering Questions (W1)

In this post, I will share some important questions which are frequently asked in competitive examinations such as SSC, UPSC and state PSCs.





  1. Per Capita water demand is the average value over a period of ...


    1. 1 day
    2. 1 week
    3. 1 month
    4. 1 year

    View Answer
    Answer: d

  2. Which of the following practices causes a reduction in the per capita water consumption?


    1. Hotter Climate
    2. Modern Life
    3. Metered connection
    4. Good quality of water

    View Answer
    Answer: c

  3. As per IS 1172-1993, what is the minimum domestic water consumption for town and cities with full flushing system?


    1. 200 L/H/D
    2. 155 L/H/D
    3. 135 L/H/D
    4. 100 L/H/D

    View Answer
    Answer: a

  4. As per IS 1172-1993, what is the minimum domestic water consumption for small Indian town and cities?


    1. 200 L/H/D
    2. 155 L/H/D
    3. 135 L/H/D
    4. 100 L/H/D

    View Answer
    Answer: c

  5. Which of the following industries required a maximum quantity of water to produce one unit?


    1. Automobiles
    2. Paper
    3. Fertilizer
    4. Sugar

    View Answer
    Answer: b

    S No. Name of the Industry
    Unit of production
    or raw material used
    Approx.Quantity of
    water required per
    unit of production/
    raw material in KL
    1 Automobiles Vehicles 40
    2 Distillery (Alcohol) KL 122-170
    3 Fertilizer Tonne 80-200
    4 Leather (Tanned) Tonne 40
    5 Paper Tonne 200-400
    6 Special Quality Paper Tonne 400-1000
    7 Straw board Tonne 75-100
    8 Petroleum Refinery Tonne (Crude) 1-2
    9 Steel Tonne 200-250
    10 Sugar Tonne (Crude cane) 1-2
    11 Textile Tonne (Goods) 80-140

  6. The total water demand of a city is generally assessed on the basis of:


    1. maximum hourly demand
    2. maximum hourly demand + fire demand
    3. average daily demand + fire demand
    4. greater of (a) and (b)

    View Answer
    Answer: d

  7. What is the ratio of maximum daily demand and annual average daily demand?


    1. 1.5
    2. 1.8
    3. 2.0
    4. 2.7

    View Answer
    Answer: b

  8. What if the ratio between maximum hourly consumption and average hourly demand?


    1. 2.7
    2. 2.4
    3. 1.8
    4. 1.5

    View Answer
    Answer: d

  9. What is the ratio between maximum hourly consumption and annual average hourly demand?


    1. 1.5
    2. 1.8
    3. 2.4
    4. 2.7

    View Answer
    Answer: d

  10. Coincident draft in relation to water demand is based on:


    1. peak hourly demand
    2. maximum daily demand
    3. maximum daily demand + fire demand
    4. greater of (a) and (c)

    View Answer
    Answer: c

  11. The distribution system in water supplies is designed on the basis of:


    1. average daily demand
    2. peak hourly demand
    3. coincident draft
    4. greater of (b) and (c)

    View Answer
    Answer: d

  12. If the population of a city is 1.5 Lakh, and the average water consumption is 200 lpd, then the capacity of the pipe mains, should be:


    1. 54 MLD
    2. 45 MLD
    3. 81 MLD
    4. 72 MLD

    View Answer
    Answer: a
    Since average water consumption is given,
    $1.8 \times 200 \times 150000 = 54000000 LD = 54 MLD$

  13. If the average water consumption of a city is 300 LPCD and its population is 4 lakh, the maximum hourly draft of the maximum day will be:


    1. 120 MLD
    2. 216 MLD
    3. 324 MLD
    4. none of the above

    View Answer
    Answer: c
    Maximum hourly draft $=2.7 \times 300 \times 400000 = 324 MLD$

  14. The pipe mains carrying water from the source to the reservoir are designed for the:


    1. maximum daily draft
    2. average daily draft
    3. maximum hourly draft of the maximum day
    4. maximum weekly draft

    View Answer
    Answer: a

  15. Water losses in the water supply system are assumed as:


    1. 5 %
    2. 7.5 %
    3. 15 %
    4. 25 %

    View Answer
    Answer: c




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