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Civil Engineering :: Water Supply Engineering

  1. Raw water treated with only chlorine, is known as

  2. A.
    plain chlorination
    B.
    pre-chlorination
    C.
    first-chlorination
    D.
    de-chlorination
    E.
    none of these.

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  3. The level of underground water is called

  4. A.
    water level
    B.
    water table
    C.
    negative level
    D.
    invert level.

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  5. Per capita demand of water is calculated in litres

  6. A.
    per person per day
    B.
    per person per month
    C.
    per person per year
    D.
    none of these.

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  7. P.V.C. pipes can withstand pressure bead of water upto

  8. A.
    25 m
    B.
    50 m
    C.
    75 m
    D.
    100 m
    E.
    125 m.

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  9. The population of a city in 2000 is 50,000. The average increase in population over last 8 decades is 7500 and average incremental increase during 8 decades is 750. The population of the city based on incremental method, in the year 2020 will be

  10. A.
    55,000
    B.
    60,500
    C.
    66,500
    D.
    72,500
    E.
    76,500

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  11. Air inlet valve in water mains, is generally provided at

  12. A.
    summit of the pipe
    B.
    upstream of sluice valve
    C.
    down stream of sluice valve
    D.
    valley of the pipe
    E.
    both (a) and (c) of above.

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  13. The duration of contact of chlorine with water before it is served to the first consumer, should be at least

  14. A.
    10 to 15 minutes
    B.
    15 to 20 minutes
    C.
    20 to 30 minutes
    D.
    30 to 40 minutes
    E.
    one hour.

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  15. The diameter of pipes in bath rooms and lavatories in domestic water supply, is

  16. A.
    6 mm
    B.
    12 mm
    C.
    18 mm
    D.
    24 mm.

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  17. Pick up the incorrect statement from the following :

  18. A.
    The water entering the slow sand filters should be treated by 9.386 coagulants
    B.
    The depth of water on the filter should be twice the depth of the filter sand
    C.
    When the filter head is 0.75 times the depth of filter sand, the water obtained is purest
    D.
    The cleaning of slow sand filters is done by back washing
    E.
    All the above.

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  19. m and n are monsoon duration factor and catchment factor respectively. If P is yearly rainfall in cm, runoff can be calculated by

  20. A.
    velocity area method
    B.
    weir or spillway method
    C.
    use of venturi-meter
    D.
    using power plant consumption
    E.
    none of these.

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