The settling velocity of a particle in a sedimentation tank increases if______________?

Related Mcqs:

1. The settling velocity of a particle in a sedimentation tank increases if_________________?

   A. particle size is decreased B. the surface area of tank is increased C. the depth of tank is decreased D. none of the above...

2. The settling velocity of a particle in a sedimentation tank depends on__________________?

   A. depth of tank B. surface area of tank C. both depth and surface area of tank D. none of the above...

3. The velocity of flow of water in a sedimentation tank is about__________________?

   A. 5 to 10 cm/sec. B. 15 to 30 cm/sec. C. 15 to 30 cm/minute D. 15 to 30 cm/hour...

4. Settling velocity increases with_______________?

   A. specific gravity of solid particles B. size of particles C. depth of tank D. temperature of liquid...

5. The detention period and overflow rate respectively for plain sedimentation as compared to sedimentation with coagulation are generally_______________?

   A. less and more B. less and less C. more and less D. more and more...

6. The length of rectangular sedimentation tank should not be more than_______________?

   A. B B. 2B C. 4B D. 8B where B is the width of the tank...

7. For a given discharge, the efficiency of sedimentation tank can be increased by______________?

   A. increasing the depth of tank B. decreasing the depth of tank C. increasing the surface area of tank D. decreasing the surface area of tank...

8. Percentage of bacterial load that can be removed from water by the process of plain sedimentation is about_______________?

   A. 10 to 25 B. 50 C. 75 D. 100...

9. The chemical most commonly used to increase speed of sedimentation of sewage is_______________?

   A. sulphuric acid B. copper sulphate C. lime D. sodium permanganate...

10. The overflow rate for plain sedimentation tanks is about__________________?

    A. 500 to 750 litres/hour/ m2 B. 1000 to 1250 litres/hour/ m2 C. 1250 to 1500 litres/hour/m2 D. 1500 to 2000 litres/hour/m2...