Home / Civil Engineering / Waste Water Engineering :: section-8

Civil Engineering :: Waste Water Engineering

  1. For providing an Indian type W.C., the R.C.C. slabs in the toilet portion

  2. A.

     Should be sunk by 20 cm

    B.

     Should be kept 20 cm above the adjacent portion

    C.

     Should be sunk by 50 cm

    D.

     Need not be sunk


  3. In Chezy’s formula V = C rs for calculating the velocity of flow in circular sewer of diameter running full, the value of hydraulic mean radius is

  4. A.

     D/1

    B.

     D/2

    C.

     D/3

    D.

     D/4


  5. Hydraulic mean radius is

  6. A.

     Mean radius of sewer

    B.

     Difference in heads between two points in circular pipes

    C.

     Mean of radii in a pipe line of varying cross -sections

    D.

     Cross-sectional area/wetted perimeter


  7. Hazen’s formula VS = 418 (GS – Gw)d [(3T + 70)/100] is used for the settlement velocity of the particles of diameter

  8. A.

     Less than 0.01 mm

    B.

     Less than 0.05 mm

    C.

     Less than 0.1 mm

    D.

     Greater than 0.1 mm


  9. The sewer which resists sulphide corrosion, is

  10. A.

     Brick sewer

    B.

     Cast iron sewer

    C.

     R.C. sewer

    D.

     Lead sewer


  11. The arrangement made for passing the sewer line below an obstruction below the hydraulic gradient lines called

  12. A.

     Inverted syphon

    B.

     Depressed sewer

    C.

     Sag pipe

    D.

     all of these


  13. No treatment of the sewage is given if dilution factor is

  14. A.

     Less than 150

    B.

     Between 150 to 200

    C.

     Between 200 to 300

    D.

     More than 500


  15. In septic tanks,

  16. A.

     Free board of 0.3 m may be provided

    B.

     The baffles or tees are extended up to top level of scum

    C.

     The clear space between the baffle top and covering slab is about 7.5 cm

    D.

     All the above


  17. The maximum diameter of sewers adopted in the designs is

  18. A.

     1.0 m

    B.

     2.0 m

    C.

     3.0 m

    D.

     4.0 m


  19. Which one of the following part of human body withstands minimum radiation?

  20. A.

     Thyroid

    B.

     Kidneys

    C.

     Eyes

    D.

     Ovaries/testis