MCQ on Wastewater Sewage Treatment Plant - Set 07 - ObjectiveBooks

MCQ on Wastewater Sewage Treatment Plant - Set 07

Practice Test: Question Set - 07

1. In areas where light rains are uniformly distributed throughout the year, the type of sewerage system to be adopted is
    (A) Separate system
    (B) Combined system
    (C) Partially combined system
    (D) None of these

2. Self-cleansing velocity is
    (A) Velocity at dry weather flow
    (B) Velocity of water at flushing
    (C) Velocity at which no accumulation remains in the drains
    (D) Velocity of water in a pressure filter

3. 5 days-biochemical oxygen demand (BOD5) is taken at a temperature of
    (A) 0°C
    (B) 15°C
    (C) 20°C
    (D) 25°C

4. Pick up the correct statement from the following:
    (A) Inlets are provided on the road surface at the lowest point for draining rain water
    (B) Inlets are generally provided at an interval of 30 m to 60 m along straight roads
    (C) Inlets having horizontal openings, are called horizontal inlets
    (D) All the above

5. If a 2% solution of sewage sample is incubated for 5 days at 20°C and the dissolved oxygen depletion was found to be 8 mg/l. The BOD of the sewage is
    (A) 100 mg/l
    (B) 200 mg/l
    (C) 300 mg/l
    (D) 400 mg/l

6. Pick up the incorrect statement from the following:
    (A) Manholes are provided in sewer pipes at suitable intervals
    (B) Catch basins are generally provided in sewers for carrying drainage discharge
    (C) Inlets are generally provided in all sewers
    (D) None of these

7. The moisture content of sludge is reduced from 90% to 80% in a sludge digestion tank. The percentage decrease in the volume of sludge, is
    (A) 25 %
    (B) 50 %
    (C) 10 %
    (D) 5 %

8. A well oxidized sewage contains nitrogen mainly as
    (A) Nitrates
    (B) Nitrites
    (C) Free ammonia
    (D) None of these

9. In a sludge tank, the gas mainly produced, is
    (A) Oxygen
    (B) Nitrogen
    (C) Hydrogen
    (D) Carbon dioxide

10. Bio-chemical oxygen demand (BOD) for the first 20 days in generally referred to
    (A) Initial demand
    (B) First stage demand
    (C) Carbonaceous demand
    (D) All of these

11. Stoneware sewers are available in size
    (A) 10 cm
    (B) 15 cm
    (C) 20 cm
    (D) All the above

12. If ‘D’ is the diameter of upper circular portion, the overall depth of New Egg shaped sewer section, is
    (A) 1.250 D
    (B) 1.350 D
    (C) 1.425 D
    (D) 1.625 D

13. In normal conditions, the period for sludge digestion, is
    (A) 10 days
    (B) 20 days
    (C) 30 days
    (D) 60 days

14. For evaporation and measurement of settable solids, the apparatus used, is
    (A) A jar
    (B) A breaker
    (C) A test tube
    (D) An Imhoff cone

15. In trickling filter, B.O.D. is reduced to
    (A) 30 to 40%
    (B) 40 to 60%
    (C) 60 to 80%
    (D) 80 to 90%

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