Civil Interview Questions on Waste Water Engineering - Set 19 - ObjectiveBooks

Civil Interview Questions on Waste Water Engineering - Set 19

Practice Test: Question Set - 19

1. Pick up the correct statement from the following:
    (A) Turbidity is more in strong sewage
    (B) The black color indicates septic sewage
    (C) The sewage omits offensive odors after four hours
    (D) All the above

2. If the grit in grit chambers is 4.5 million liters per day, its cleaning is done
    (A) Manually
    (B) Mechanically
    (C) Hydraulically
    (D) Electrically

3. Which one of the following tests is used for testing sewer pipes?
    (A) Water test
    (B) Ball test
    (C) Mirror test
    (D) All of these

4. The ratio of depths at partial flow with central angle α and at full flow of a sewer, is
    (A) 1 - sin α/β
    (B) 1 - cos α/2
    (C) ½ (1 - cos α/2)
    (D) ½ (1 - sin α/2)

5. The non-clog pump which permits solid matter to pass out with the liquid sewage, is
    (A) Centrifugal pump
    (B) Reciprocating pump
    (C) Pneumatic ejector
    (D) None of these

6. With self cleansing velocity in sewers
    (A) Silting occurs at bottom
    (B) Scouring occurs at bottom
    (C) Both silting and scouring occur at bottom
    (D) Neither silting nor scouring occurs at bottom

7. When drainage to sewage ratio is 20, the peak dry weather flow is
    (A) 20% of the design discharge
    (B) Slightly less than 5% of the design discharge
    (C) Slightly more than 5% of the design discharge
    (D) None of these

8. As compared to fresh river water, sea water contains oxygen
    (A) 10% less
    (B) 20% less
    (C) 10% more
    (D) 20% more

9. Flocculated particles do not change their
    (A) Size
    (B) Shape
    (C) Weight
    (D) None of these

10. Imhoff cone is used to determine
    (A) Settleable solids
    (B) Suspended solids
    (C) Dissolved solids
    (D) None of these

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

12. Discrete or granular particles change their
    (A) Size
    (B) Shape
    (C) Weight
    (D) None of these

13. The sewer pipe which carries sewage from a building for immediate disposal is
    (A) House sewer
    (B) Lateral sewer
    (C) Intercepting sewer
    (D) Main sewer

14. The ratio of design discharge to the surface area of a sedimentation tank is called
    (A) Surface loading
    (B) Overflow rate
    (C) Overflow velocity
    (D) All of these

15. In SI units the power of sound is represented in
    (A) Kgs
    (B) Joules
    (C) Newtons
    (D) Watts

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