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Civil Engineering :: Waste Water Engineering

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Waste Water Engineering - Section 3
Waste Water Engineering - Section 4
Waste Water Engineering - Section 5
Waste Water Engineering - Section 6
Waste Water Engineering - Section 7
Waste Water Engineering - section-8
  1. ‘Cowl’ is provided at

    2. A.

     Lower end of ventilating column
    B.

     Upper end of ventilating column
    C.

     Upper end of the manhole
    D.

     First step in manhole

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  2. The formula V = (1/n) r2/3

    3. A.

     Chezy’s formula
    B.

     Bazin’s formula
    C.

     Kutter’s formula
    D.

     Manning’s formula

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  3. A drop manhole is provided if

    4. A.

     A sewer drops from a height
    B.

     A branch sewer joins the main sewer at higher level
    C.

     A lamp is inserted to check obstruction
    D.

     None of these

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  4. The most widely used pump for lifting sewage is

    5. A.

     Centrifugal pump
    B.

     Reciprocating pump
    C.

     Pneumatic ejector
    D.

     Air pressure pump

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  5. The non-clog pump which permits solid matter to pass out with the liquid sewage, is

    6. A.

     Centrifugal pump
    B.

     Reciprocating pump
    C.

     Pneumatic ejector
    D.

     None of these

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  6. The grit chambers of sewage treatment plants, are generally cleaned after

    7. A.

     2 days
    B.

     7 days
    C.

     12 days
    D.

     14 days

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  7. Cement concrete sewers are only suitable if non-scouring velocity is between

    8. A.

     2.5 to 3.0 m/sec
    B.

     3.0 to 4.0 m/sec
    C.

     3.5 to 4.5 m/sec
    D.

     4.5 to 5.5 m/sec

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  8. Pick up the correct statement from the following:

    9. A.

     Maximum daily flow = 2 times the average daily flow
    B.

     Maximum daily flow = ⅔ × average daily flow
    C.

     Sewers are designed for minimum permissible velocity at minimum flow
    D.

     All the above

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  9. Pick up the correct statement from the following:

    10. A.

     Small sewers are cleaned by flushing
    B.

     Medium sewers are cleaned by cane rodding
    C.

     Medium sewers may be cleaned by pills
    D.

     All the above

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  10. In sewers the velocity of flow should not be

    11. A.

     More than the self-cleansing velocity
    B.

     Less than the self-cleansing velocity
    C.

     Less than 10 m/sec
    D.

     More than 20 m/sec

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