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

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1. 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...

2. 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...

3. 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...

4. The maximum depth of sedimentation tanks, is kept__________________?

   A. 3 m B. 3.5 m C. 4 m D. 4.5 m...

5. For a continuous flow type of sedimentation tanks__________________?

   A. Width of the tank is normally kept about 6 m B. Length of the tank is normally kept 4 to 5 times the width C. Maximum horizontal flow velocity is limited to 0.3 m/minute D. All the above...

6. 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...

7. The flow velocity in detritus tanks is________________?

   A. 0.05 m/sec B. 0.09 m/sec C. 1.25 m/sec D. None of these...

8. Normal depth in open channel flow is the depth of flow corresponding to_______________?

   A. steady flow B. unsteady flow C. laminar flow D. uniform flow E. critical flow...

9. 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...

10. In primary sedimentation, the 0.2 mm inorganic solids get separated if specific gravity is_________________?

    A. 2.25 B. 2.50 C. 2.55 D. 2.65...