Waste Water Engineering MCQ pdf - Set 04 - ObjectiveBooks

Waste Water Engineering MCQ pdf - Set 04

Practice Test: Question Set - 04


1. Traps
    (A) Are water seals which prevent the entry of foul gases
    (B) Are used to trap the rats entering sewers
    (C) Dissolve the foul gases
    (D) Create symphonic action to increase the quick disposal of sewerage

2. The sewage treatment units in which anaerobic decomposition of organic matter is used, are called
    (A) Imhoff tanks
    (B) Trickling filters
    (C) Sludge sedimentation tanks
    (D) None of these

3. Pick up the correct statement from the following:
    (A) In treated sewage, 4 ppm of D.O. is essential
    (B) Only very fresh sewage contains some dissolved oxygen
    (C) The solubility of oxygen in sewage is 95% that is in distilled water
    (D) All the above

4. If the diameter of a sewer is 150 mm, the gradient required for generating self cleansing velocity, is
    (A) 1 in 60
    (B) 1 in 100
    (C) 1 in 120
    (D) None of these

5. The sewer which received discharge from two or more main sewers, is known as
    (A) A trunk sewer
    (B) An outfall sewer
    (C) A main sewer
    (D) An intercepting sewer

6. The grit and silt of the grit chambers, may not be used for
    (A) Raising low lying areas by dumping
    (B) Concreting
    (C) Both (a) and (b)
    (D) Neither (a) nor (b)

7. For treating the sewage of a large city, you will recommend
    (A) A sedimentation tank and an activated sludge treatment plant
    (B) A plant consisting of Imhoff tanks with low rate trickling filters
    (C) Sedimentation tanks with high rate trickling filters
    (D) None of these

8. Imhoff cone is used to measure
    (A) Total organic solids
    (B) Total solids
    (C) Total in organic solids
    (D) Settleable solids

9. Pick up the correct statement from the following:
    (A) The ratio of the quantity of the diluting water to that of the sewage, is known as dilution factor
    (B) The automatic purification of polluted water, is known self purification phenomenon
    (C) The photosynthesis is carried out in the presence of sun light
    (D) All the above

10. 1000 kg of sewage contains
    (A) 0.112 kg in suspension
    (B) 0.112 kg in solution
    (C) 0.225 kg in solution
    (D) Both (a) and (c) of above

11. Dilution method of disposing of sewage, is not preferred to
    (A) When sewage is fresh
    (B) When diluting water has high dissolved oxygen content
    (C) When diluting water is used for water supply near the point of sewage disposed
    (D) When the diluting water is having flow currents

12. If the peak discharge of a storm water drain (S.W. Drain) is expected to exceed 150 cumecs, the free board to be provided, is
    (A) 100 cm
    (B) 90 cm
    (C) 80 cm
    (D) 50 cm

13. The reduced levels of the string at the consecutive sight rails A and B are 203.575 m, 203.475 m respectively. If the difference of their R.D.s is 10 m, the gradient of the sewer line is
    (A) 1 in 100 upward
    (B) 1 in 500 upward
    (C) 1 in 100 downward
    (D) 1 in 503 upward

14. R.M.O. expenses include
    (A) Running expenses
    (B) Maintenance expenses
    (C) Operation expenses
    (D) All the above

15. For the COD test of sewage, organic matter is oxidised by K2Cr207 in the presence of
    (A) H2SO4
    (B) HNO3
    (C) HCl
    (D) None of these

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