The maximum depth of sedimentation tanks, is kept__________________?

Related Mcqs:

1. The detention period for plain sedimentation water tanks, is usually____________________?

   A. 4 to 8 hours
   B. 8 to 16 hours
   C. 16 to 24 hours
   D. 24 to 36 hours

2. The normal values of over flow rates for secondary sedimentation tanks, ranges between__________________?

   A. 25,000 to 35,000 litres/sqm/day
   B. 40,000 to 50,000 litres/sqm/day
   C. 50,000 to 60,000 litres/sqm/day
   D. 80,000 to 10,000 litres/sqm/day

3. The normal value of over flow rates for plain primary sedimentation tanks, ranges between________________?

   A. 25,000 to 35,000 litres/sqm/day
   B. 40,000 to 50,000 litres/sqm/day
   C. 50,000 to 60,000 litres/sqm/day
   D. 80,000 to 100,000 litres/sqm/day

4. The normal values of over flow rates for sedimentation tanks using coagulant, ranges between__________________?

   A. 25,000 to 35,000 litres/sqm/day
   B. 40,000 to 50,000 litres/sqm/day
   C. 50,000 to 60,000 litres/sqm/day
   D. 80,000 to 100,000 litres/sqm/day

5. Inter-distance between ventilation columns in a sewer line is kept__________________?

   A. 25 to 50 m
   B. 50 m to 100 m
   C. 100 m to 150 m
   D. 150 m to 300 m

6. In a sedimentation tank (length L, width B, depth D) the settling velocity of a particle for a discharge Q, is____________________?

   A. Q/(B × D)
   B. Q/(L × D)
   C. Q/L
   D. Q/(B × L)

7. The dimensions of a rectangular settling tank are: length 24 m, width 6 m and depth 3 m. If 2 hour detention period for tanks is recommended, the rate of flow of sewage per hour, is_____________________?

   A. 204 cu.m
   B. 208 cu.m
   C. 212 cu.m
   D. 216 cu.m

8. The digested sludge from septic tanks, is removed after a maximum period of__________________?

   A. 3 years
   B. 3.5 years
   C. 4 years
   D. 5 years

9. The sewage discharge in a detritus tank of a treatment plant is 576 litres/sec with flow velocity of 0.2 m/sec. If the ratio of width to depth is 2, the depth is____________________?

   A. 100 cm
   B. 110 cm
   C. 120 cm
   D. 150 cm

10. In circular sewers if depth of flow is 0.2 times the full depth, the nominal gradient,______________?

    A. Is only provided
    B. Is doubled
    C. Is trebled
    D. Is not enough